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Water Resources Data 
California 

Water Year 1993 

■4 

Volume 2. Pacific Slope Basins from Arroyo Grande to 
Oregon State Line except Central Valley 




U.S. GEOLOGICAL SURVEY WATER-DATA REPORT CA-93-2 
Prepared in cooperation with the California Department of 
Water Resources and with other agencies 



CALENDAR FOR WATER YEAR 1993 
1992 



OCTOBER 

S M T W T F S 

1 2 3 

4 5 6 7 8 9 10 

11 12 13 14 15 16 17 

18 19 20 21 22 23 2' 

25 26 27 28 29 30 3 



JANUARY 

S M T W T F 

1 

3 4 5 6 7 8 

10 11 12 13 14 15 1 

17 18 19 20 21 22 : 

24 25 26 27 28 29 .' 
31 

APRIL 

S M T W T F 

1 2 

4 5 6 7 8 9 

11 12 13 14 15 16 

18 19 20 21 22 23 

25 26 27 28 29 30 

JULY 

5 M T W T F 

1 2 3 

4 5 6 7 8 9 10 

11 12 13 14 15 16 17 

18 19 20 21 22 23 24 

25 26 27 28 29 30 31 



NOVEMBER 

S M T W T F S 

12 3 4 5 6 7 

8 9 10 11 12 13 14 

ic n 18 ]Q ^Q 21 



DATE DUE 








































































1 



Library - MP Region 
U. S. Bureau Reclamation 

2800 Cottage Way 
Sacramento, CA 95825-1898 



DECEMBER 

5 M T W T F S 

12 3 4 5 

6 7 8 9 10 11 12 
13 14 15 16 17 18 19 

^1 22 23 24 25 26 

!8 29 30 31 



DEMCO 



12 3 4 5 6 7 

8 9 10 11 12 13 14 

15 16 17 18 19 20 21 

22 23 24 25 26 27 28 

29 30 31 



MARCH 



M T W 



1 


2 


3 


4 


5 


6 


8 


9 


10 


11 


12 


13 


15 


16 


17 


18 


19 


20 


22 


23 


24 


25 


26 


27 


29 


30 


31 










JUNE 








M 


T 


W 


T 


F 


S 




1 


2 


3 


4 


5 


7 


8 


9 


10 


11 


12 


14 


15 


16 


17 


18 


19 


21 


22 


23 


24 


25 


26 


28 


29 


30 









SEPTEMBER 

M T W T F S 

12 3 4 

5 6 7 8 9 10 11 

12 13 14 15 16 17 18 

19 20 21 22 23 24 25 

26 27 28 29 30 




551 oc 



Water Resources Data 
California 

Water Year 1 993 

Volume 2. Pacific Slope Basins from Arroyo Grande to 
Oregon State Line except Central Valley 

by J.R. Palmer, M.F. Friebel, LF. Trujillo, and K.L Markham 




U.S. GEOLOGICAL SURVEY WATER-DATA REPORT CA-93-2 
Prepared in cooperation with the California Department of 
Water Resources and with other agencies 



U.S. DEPARTMENT OF THE INTERIOR 

BRUCE BABBITT, Secretary 

U.S. GEOLOGICAL SURVEY 

Gordon P. Eaton, Director 



For information on the water program in California write to 

District Chief, Water Resources Division 

U.S. Geological Survey 

Federal Building, Room W-2233 

2800 Cottage Way 

Sacramento, CA 95825 



1994 



PREFACE 

This volume of the annual hydrologic data report of California is one of a 
series of annual reports that document hydrologic data gathered from the U.S. 
Geological Survey's surface- and ground-water data-collection networks in each 
State, Puerto Rico, and the Trust Territories. These records of streamflow, 
ground-water levels, and water quality provide the hydrologic information 
needed by Federal, State, and local agencies, and the private sector for 
developing and managing our Nation's land and water resources. Hydrologic 
data for California are contained in five volumes: 

Volume 1. Southern Great Basin from Mexican Border to Mono Lake Basin and 
Pacific Slope Basins from the Tijuana River to Santa Maria 
River 

Volume 2. Pacific Slope Basins from Arroyo Grande to Oregon State Line 
except Central Valley 

Volume 3. Southern Central Valley Basins and The Great Basin from Walker 
River to Truckee River 

Volume 4. Northern Central Valley Basins and The Great Basin from Honey 
Lake Basin to Oregon State Line 

Volume 5. Ground-water data 

This report is the culmination of a concerted effort by dedicated 
personnel of the U.S. Geological Survey who collected, compiled, analyzed, 
verified, and organized the data. In addition to the authors, who had primary 
responsibility for assuring that the information contained herein is accurate, 
complete, and adheres to U.S. Geological Survey policy and established 
guidelines, the individuals contributing significantly to the collection, 
processing, and tabulation of the data are given on page V. 

This report was prepared in cooperation with the California Department of 
Water Resources and with other agencies, under the general supervision of 
Michael V. Shulters , District Chief, California. 



Ill 



30272-101 



REPORT DOCUMENTATION 
PAGE 



1. REPORT NO. 

USGS/WRD/HD-94/ 303 



S. Raclplanrt Acc*«»lon No 



4. TKI< and Subtitle 

Water Resources Data — California, Water Year 1993, Volume 2 
Pacific Slope Basins from Arroyo Grande to Oregon State Line 
except Central Valley 



S. Report Date 

June 1994 



7. Author(t) 

J.R. Palmer, 



M.F. Friebel, L.F. Trujillo, and K.L. Markham 



t. Rarformlng OnanUcatlon Rapt. No. 

USGS-WDR-CA-93-2 



9. Parformlng Orsanlzation Nama and Addraaa 

U.S. Geological Survey, Water Resources Division 

California District 

2800 Cottage Way, Room W-2233 

Sacramento, CA 95825 



>a Prelact/Taak/Worli Unit No. 



11. Contract(C) or Qrant(G) No. 

<C) 

(G) 



12. Sponsoring Organixatlon Nama and Addraat 

U.S. Geological Survey, Water Resources Division 

California District 

2800 Cottage Way, Room W-2233 

Sacramento, CA 95825 



IS. Typa of Raport & Parted Covarad 

Annual~0ct. 1, 1992 to 
Sept. 30, 1993 



14. 



15. Supplemantary Notes 

Prepared in cooperation with the California Department of Water Resources and with 
other agencies. 



16. Atwtract (Limit: 200 words) 

Water resources data for the 1993 water year for California consist of records of stage, 
discharge, and water quality of streams; stage and contents in lakes and reservoirs; and 
water levels and water quality in wells. Volume 2 contains discharge records for 119 
streamf low-gaging stations, 1 low-flow partial-record streamflow station, and 6 
miscellaneous measurement stations; stage and contents records for 6 lakes and 
reservoirs; precipitation records for 3 stations; and water-quality records for 31 
streamf low-gaging stations. These data represent that part of the National Water Data 
System operated by the U.S. Geological Survey and with other agencies. 



17. Document Analysis a. Descriptors 

^California, *Hydrologic data, *Surface water, Water quality. Flow rate. Gaging stations. 
Lakes, Reservoirs, Chemical analyses, Sediment, Water temperatures. Sampling sites 



b. Idantlfiers/Open-Ended Terms 



c. COSATI Held/Group 



18. Availability statemen; No restriction on distribution. 
This report may be purchased from 
National Technical Information Service 
Springfield, VA 22161 



19. Security Class (This Raport) 

Unclassified 



20. Security Class (This Page) 

Unclassified 



21. No. of Pages 

412 



22. Price 



(See ANSI-Z39.18) 

IV 



See Inatrucfiona on Reverse 



OPTIONAL FORM 272 (4-7: 
(Formeriy NTIS-35) 
Department of Commerce 



WATER RESOURCES DIVISION 

Anthony Buono, Assistant District Chief, South 

Steven J. Deverel, Assistant District Chief, North 

James C. Bowers, Chief, Southern California Operations 

James R. Mullen, Chief, Northern California Operations 

Steven W. Anderson, Supervisory Hydrologic Technician 

Wendell W. Ayers , Hydrologic Technician 

James B. Baker, Lead Editorial Assistant 

William L. Boults, Hydrologic Technician 

Paul A. Buchanan, Hydrologic Technician 

Carol L. Donovan, Editor 

Trudy L. Dorsey, Hydrologic Technician 

Patrick L. Dugle, Hydrologic Technician 

Laureen J. Fong-Frydendal, Hydrologic Technician 

Lawrence A. Freeman, Hydrologic Technician 

James J. Gibbons, Hydrologic Technician 

Terry B. Gordon, Hydrologic Technician 

Scott N. Hamlin, Hydrologist 

Stuart A. Hill, Hydrologic Technician 

Ernest R. Houston, Hydrologic Technician 

Joel D. Johnson, Hydrologist 

Gavin M. Kistinger, Hydrologic Aid 

Daniel S. Kogut, Hydrologic Technician 

Jon C. McNulty, Hydrologic Technician 

Allan C. Mlodnosky, Hydrologic Technician 

Christine S. O'Neil, Hydrologic Technician 

Carlyle T. Peck, Hydrologic Technician 

Lee A. Price, Hydrologic Technician 

Robert V. Reyes, Hydrologic Aid 

M. Kathy Shay, Computer Technician 

Kathleen L. St. Clair, Hydrologic Technician 

Gregory F. Susich, Hydrologic Technician 

Michael D. Webster, Lead Hydrologic Technician 

Kathy L. Wells, Hydrologic Clerk 

M. Kay Witter, Editorial Assistant 

Kevin S. Wright, Hydrologic Technician 

George S. Yamamoto, Scientific Illustrator 

Ronald P. Fogelman, Supervisory Hydrologist 

Lawrence A. Freeman, Hydrologic Technician 

Richard A. Hunrichs, Hydrologist 

Rick T. Iwatsubo, Biologist 

Robert W. Meyer, Hydrologist 

Robert G. Simpson, Hydrologist 



CONTENTS 



Page 

Preface ^^^ 

List of surface-water and water-tjuality stations, in dovmstream order, for which records 

are published in this volume IX 

List of discontinued gaging stations XII 

List of discontinued lakes and reservoirs XV 

List of discontinued water-quality stations XV 

Introduction '■ 

Cooperation '■ 

Summary of hydrologic conditions 2 

Surface water ^ 

Water quality 6 

Sediment ^ 

Hydrodynamic data for San Francisco Bay 7 

Special networks and programs 7 

Explanation of the records 8 

Station-identification numbers 8 

Downstream-order system 8 

Latitude-longitude system 8 

Records of stage and water discharge 8 

Data collection and computation ® 

Data presentation ^0 

Identifying estimated dally discharge 12 

Accuracy of the records 12 

Other records aval lable 13 

Records of surface-water quality 13 

Classification of records 13 

Arrangement of records 13 

Onslte measurements and sample collection 13 

Water temperature 1* 

Sediment 1* 

Cross-sectional data 1* 

Laboratory measurements 1* 

Data presentation 15 

Access to WATSTORE data 15 

Definition of terms 16 

Publications on Techniques of Water-Resources Investigations 23 

Gaging station and water-quality records *3 

Remark codes *3 

Discharge at partial-record stations and miscellaneous sites 385 

Index 389 



ILLUSTRATIONS 



Figure 1. 
2-«. 



5. 
6-17. 



Page 

Map of California showing runoff, in percent of median, for the 1993 water year 3 

Graphs showing : 

2. Discharge eind precipitation during water year 1993 and long-term average 

at four representative gaging stations * 

3. Annual departure from 1961-90 mean discharge for period of record at selected gaging 

stations 5 

4. Comparison of monthly mean dissolved-solids concentrations during water year 1993 with 

long-term dissolved-solids concentrations at two selected stations 6 

Diagram showing system for numbering miscellaneous sites (latitude and longitude) 8 

Maps showing location of discharge and water-quality stations: 

6 . Alameda County 26 

7. Contra Costa County 27 

8 . Del Norte County 28 

9 . Humboldt County 29 

10 . Lake County 30 

11. Marin County 31 

12. Mendocino County 32 

13. Monterey County 33 

14 . Napa County 3* 

15. San Benito County 35 

16. San Francisco and San Mateo Counties 36 

17. San Luis Obispo County 37 

VII 



VIII 



Paga 

18-22. Maps shoMlng Location of discharge and Mater-quallty stations: 

18 . Santa Clara County 38 

19 . Santa Cruz County 39 

20. Siskiyou County *0 

21. Sonoma County 41 

22. Trinity County *2 

23-26. Schematic diagram showing diversions and storage: 

23. Salinas River basin 56 

24 . Russian River basin 226 

25. Eel River basin 272 

26 . Klamath River and Trinity River basins 33* 



TABLES 



Pag* 

Table 1. Comparison of peak discharge for 1993 water year with those for period of record for selected 

stations 2 

2. Comparison of 7-day and 1-day low flow for 1993 water year to 7-day, 1-day, and mlnlaiuiii 

daily flow for 30-year base period 1961-90, for selected stations 6 



SURFACE-WATER AND WATER-QUALITY STATIONS, IX 

IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME 

[Letters after station name designate type of data: (d), discharge; 

(1), elevation, gage heights, or contents; (c) , chemical; (b), biological; (p), precipitation; 

(8). gage height; (t), water temperature; and (s), sediment] 

Station 

No. Page 
PACIFIC SLOPE BASINS IN CALIFORNIA 

ARROYO GRANDE BASIN 

Lopez Creek near Arroyo Grande (d) 11141280 45 

BIG SUR RIVER BASIN 

Big Sur River near Big Sur (d) 11143000 47 

CARMEL RIVER BASIN 

Carmel River at Robles Del Rio (d) 11143200 49 

Carmel River near Carmel (ds ) 11143250 51 

SALINAS RIVER BASIN 
Paso Robles Creek: 

Santa Rita Creek near Templeton (d) 11147070 57 

Salinas River at Paso Robles (d) 11147500 59 

Estrella River near Estrella (d) 11148500 61 

Nacimiento River below Sapaque Creek, near Bryson (ds) 11148900 63 

Nacimiento River below Nacimiento Dam. near Bradley (d) 11149400 67 

San Antonio River near Lockwood (ds ) 11149900 69 

Salinas River near Bradley (d) 11150500 74 

Salinas River at Soledad (d) 11151700 76 

Arroyo Seco near Soledad (d) 11152000 78 

Salinas River near Chualar (dcs ) 11152300 80 

Salinas River near Spreckels (d) 11152500 84 

El Toro Creek near Spreckels (d) 11152540 86 

TEMBLADERO SLOUGH BASIN 
Reclamation Ditch: 

Gabilan Creek near Salinas (d) 11152600 88 

PAJARO RIVER BASIN 

Pajaro River: 

Carnadero Creek: 

San Benito River near Willow Creek School (d) 11156500 90 

San Benito River at State Highway 156, near Hollister (d) 11158600 92 

Pajaro River at Chittenden (d) 11159000 94 

Corralltos Creek at Freedom (d) 11159200 96 

SOQUEL CREEK BASIN 

Soquel Creek at Soquel (ds) 11160000 98 

SAN LORENZO RIVER BASIN 

San Lorenzo River near Boulder Creek (d) 11160020 103 

Bear Creek at Boulder Creek (d) 11160060 105 

Boulder Creek at Boulder Creek (d) 11160070 107 

Zayante Creek at Zayante (d) 11160300 109 

Bean Creek near Scotts Valley (d) 11160430 111 

San Lorenzo River at Big Trees (ds ) 11160500 113 

San Lorenzo River at Santa Cruz (d) 11161000 118 

Carbonera Creek at Scotts Valley (d) . . 11161300 120 

PESCADERO CREEK BASIN 

Pescadero Creek near Pescadero (ds) 11162500 122 

SAN GREGORIO CREEK BASIN 

San Gregorio Creek at San Gregorio (ds) 11162570 127 

PILARCITOS CREEK BASIN 

Pilarcitos Creek at Half Moon Bay (d) 11162630 131 

SAN FRANCISCO BAY 

San Francisco Bay at Presidio Military Reservation (et) 11162690 133 

San Francisco Bay at Pier 24, at San Francisco (ct) 11162700 136 

COLMA CREEK BASIN 

Colma Creek at South San Francisco (dp) 11162720 141 

SAN FRANCISCO BAY 

San Francisco Bay at San Mateo Bridge, near Foster City (ct) 11162765 143 

REDWOOD CREEK BASIN 

Redwood Creek at Redwood City (d) 11162800 148 

SAN FRANCISQUITO CREEK BASIN 

San Francisquito Creek at Stanford University (dp) 11164500 150 

MATADERO CREEK BASIN 

Matadero Creek at Palo Alto (d) 11166000 152 

GUADALUPE RIVER BASIN 

Guadalupe River at San Jose (d) 11169000 154 

Saratoga Creek at Saratoga (d) 11169500 156 

ALAMEDA CREEK BASIN 

Alameda Creek: 

Arroyo de la Laguna: 

Arroyo Mocho near Llvermore (d) 11176000 163 

Arroyo Valle below Lang Canyon, near Llvermore (d) 11176400 160 

Arroyo Valle near Llvermore (d) 11176500 162 

Arroyo de la Laguna near Pleasanton (d) 11177000 164 

Alameda Creek near Niles (dc) 11179000 166 

Dry Creek at Union City (d) 11180500 170 

Patterson Creek at Union City (d) 11180700 172 



X SURFACE-WATER AND WATER-QUALITY STATIONS, 

IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME— Continued 

Station 

Ho. Page 
PACIFIC SLOPE BASINS IN CALIFORNIA — Continued 

SAN LORENZO CREEK BASIN 

San Lorenzo Creek above Don Castro Reservoir, near Castro Valley (dts) 11180825 173 

Crow Creek : 

Cull Creek above Cull Creek Reservoir, near Castro Valley (dts) 11180960 181 

Castro Creek: 

Castro Valley Creek at Knox Street, at Castro Valley (d) 11181006 188 

Castro Valley Creek at Hayward (d) 11181008 190 

San Lorenzo Creek at San Lorenzo (dts) 111810A0 192 

TEMESCAL CREEK BASIN 

Temescal Creek above Lake Temescal, at Oakland (d) 11181330 197 

SAN FRANCISCO BAY 

San Pablo Strait at Point San Pablo (get) 11181360 199 

WILDCAT CREEK BASIN 

Wildcat Creek at Vale Road, at Richmond (d) 11181390 206 

PACHECO CREEK BASIN 

Walnut Creek (head of Pacheco Creek): 

San Ramon Creek at San Ramon (d) 11182500 208 

NAPA RIVER BASIN 

Napa River near St. Helena (d) 11456000 210 

Napa River near Napa (dcs) 11458000 212 

NOVATO CREEK BASIN 

Novato Creek at Novato (d) 11459500 216 

CORTE MADERA CREEK BASIN 

Corte Madera Creek at Ross (d) 11460000 218 

LAGUNITAS CREEK BASIN 

Lagunitas Creek at Samuel P. Taylor State Park (d) 11460400 220 

Lagunitas Creek near Point Reyes Station (d) 11460600 222 

WALKER CREEK BASIN 

Walker Creek near Marshall (d) 11460750 224 

RUSSIAN RIVER BASIN 

Russian River near Ukiah (d) 11461000 227 

East Fork Russian River near Calpella (d) 11461500 229 

East Fork Russian River near Ukiah (dt) 11462000 231 

Russian River near Hopland (ds) 11462500 235 

Russian River near Cloverdale (d) 11453000 239 

Big Sulphur Creek at Geysers Resort, near Cloverdale (d) 11463170 241 

Big Sulphur Creek near Cloverdale (d) 11463200 243 

Russian River at Digger Bend, near Healdsburg (d) 11463980 244 

Russian River near Healdsburg (dt) 11464000 245 

Dry Creek below Warm Springs Dam, near Geyserville (dt) 11465000 249 

Dry Creek near Geyserville (d) 11465200 253 

Dry Creek near mouth, near Healdsburg (d) 11465350 255 

Santa Rosa Creek: 

Laguna de Santa Rosa near Graton (1) 11466500 256 

Russian River near Guemeville (dcs) 11467000 257 

GUALALA RIVER BASIN 

South Fork Gualala River near Annapolis (d) 11467500 261 

GARCIA RIVER BASIN 

Garcia River a Eureka Hill Road, near Point Arena (s) 11467590 263 

NAVARRO RIVER BASIN 

Navarro River near Navarro (d) 11468000 266 

NOYO RIVER BASIN 

Noyo River near Fort Bragg (d) 11468500 268 

MATTOLE RIVER BASIN 

Mattole River near Petrolia (d) 11469000 270 

EEL RIVER BASIN 

Lake Pillsbury near Potter Valley (1) 11470000 273 

Eel River below Scott Dam, near Potter Valley (d) 11470500 274 

Potter Valley Powerhouse Intake near Potter Valley (d) 11471000 276 

Potter Valley Powerhouse Tailrace near Potter Valley (d) 11471099 278 

Eel River at Van Arsdale Dam, near Potter Valley (d) 11471500 280 

Eel River near Dos Rios (d) 11472150 282 

Outlet Creek near Longvale (d) 11472200 28* 

Middle Fork Eel River near Dos Rios (d) 11473900 286 

Kekawaka Creek below Kekawaka Creek Powerhouse Diversion, near Zenia (d) 11474780 288 

Eel River at Fort Seward (d) 11475000 290 

South Fork Eel River: 

Elder Creek near Branscomb (dcps) 11475560 292 

South Fork Eel River at Leggett (d) 11475800 296 

South Fork Eel River near Miranda (d) 11476500 298 

Bull Creek near Weott (d) 11476600 300 

Eel River at Scotia (dcs) 11477000 302 

Mill Creek below Diversion Dam, near Dinsmore (d) 11477425 307 

Sulphur Creek below Diversion Dam, near Dinsmore (d) 11477450 308 

Mill Creek below Sulphur Creek, at Dinsmore (d) 11477475 309 

Van Duzen River near Brldgevlllo (d) 11478500 312 

Eel River at Fembridge (g) 11479560 314 



SURFACE-WATER AND WATER-QUALITY STATIONS, XI 
IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME— Continued 

Station 

No . Page 
PACIFIC SLOPE BASINS IN CALIFORNIA — Continued 
MAD RIVER BASIN 

Mad River above Ruth Reservoir, near Forest Glen (d) 11480390 316 

Ruth Reservoir near Forest Glen (1) 11480400 318 

Mad River below Ruth Reservoir, near Forest Glen (d) 11480410 319 

Mad River near Forest Glen (d) 11480500 321 

Mad River near Areata (d) 11481000 323 

LITTLE RIVER BASIN 

Little River near Trinidad (d) 11481200 325 

REDWOOD CREEK BASIN 

Redwood Creek near Blue Lake (ds) 11481500 327 

Redwood Creek at Orick (ds) 11482500 330 

KLAMATH RIVER BASIN 

Reservoirs in Klamath River basin: 

Copco Lake near Copco (1) 11511400 335 

Iron Gate Reservoir near Hombrook (1) 11516510 335 

Klamath River below Iron Gate Dam (d) 11516530 336 

Shasta River near Yreka (d) 11517500 338 

Scott River near Fort Jones (d) 11519500 340 

Klamath River near Seiad Valley (d) 11520500 342 

Indian Creek near Happy Camp (d) 11521500 344 

Salmon River at Somes Bar (d) 11522500 346 

Klamath River at Orleans (d) 11523000 348 

Trinity River above Coffee Creek, near Trinity Center (d) 11523200 350 

Clair Engle Lake near Lewiston (1) 11525400 352 

Judge Francis Carr Powerplant near French Gulch (d) 11525430 353 

Trinity River at Lewiston (d) 11525500 355 

Little Grass Valley Creek near Lewiston (s) 11525580 357 

Grass Valley Creek at Fawn Lodge, near Lewiston (dts) 11525600 360 

Trinity River near Burnt Ranch (d) 11527000 368 

South Fork Trinity River below Hyampom (d) 11528700 370 

Trinity River at Hoopa (d) 11530000 372 

Klamath River near Klamath (dcs) 11530500 374 

SMITH RIVER BASIN 

Smith River near Crescent City (dcs) 11532500 379 

Smith River near Fort Dick (g) 11532650 383 



XII 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



DISCONTINUED GAGING STATIONS 

The following continuous-record stieamClow stations In California have been discontinued or converted to 
partial-record stations. Dally records were collected and are stored In WATSTORZ for the period of record shown 
for each station. 



Station 
Ho. 



Station name 



Drainage 


Period 


area 
(ml'') 


of 


record 


13.4 


1967-92 


3.11 


1967-75 


68.3 


1958-66 


18.2 


1968-79 


102 


1940-86 


15 


1968-78 


24 


1971-78 


18 


1971-78 


12.5 


1957-72 


22.9 


1988-89 


26.3 


1988-89 


41.2 


1951-79 


34.6 


1978 


.82 


1961-63 


13.8 


1967-78 


70.3 


1943-83 


g.s6 


1961-69, 1972-83 


5.91 


1970-83 


112 


1974-86 


114 


1942-75 


149 


1922, 1932-49 


25.3 


1950-78 


2.95 


1967-72 


101 


1959-72 


9.26 


1959-65 


227 


1959-72 


787 


1940-41 


147 


1958-71 


349 


1940-57 


5.16 


1968-69 


4.8 


1961-64 


210 


1940-42 


259 


1943-45 


113 


1961-86 


14.2 


1971-74 


53.2 


1971-86 


12.8 


1962-82 


146 


1940-82 


154 


1982-85 


9.63 


1972-82 


19.6 


1952-71 


399 


1959-82 


2.88 


1973-74 


.91 


1970-72 


21 


1961-82 


30.4 


1931-57 


7.40 


1960-82 


71.2 


1959-92 


505 


1941 


108 


1950-53, 1960-63 


1.24 


1964-69 


38.3 


1959-70 


206 


1941-83 


566 


1950-83 


10.2 


1970-81 


10.6 


1958-72 


7.05 


1964-67 


L,272 


1912-13, 1972-73 


10.2 


1972-85 


12.2 


1959-72 


12.2 


1959-72 


32.0 


1969-72 


6.17 


1968-93 


16.0 


1977-93 


11.3 


1976-93 


8.98 


1958-60 


11.1 


1957-93 


17.3 


1940-43, 1952-68 


3.77 


1970-76 


3.07 


1970-76 


6.07 


1970-85 


25.1 


1959-73 


27.3 


1937, 1939-41 


18.3 


1962-74 



11141150 Arroyo Grande above Phoenix Creek, near Arroyo Grande 

11141160 Wittenberg Creek near Arroyo Grande 

11141300 Arroyo Grande near Arroyo Grande 

11141400 Tar Spring Creek near Arroyo Grande 

11141500 Arroyo Grande at Arroyo Grande 

11141600 Los Berros Creek near Nlpomo 

11142080 Morro Creek at Morro Bay 

11142100 Toro Creek near Morro Bay 

11142200 Santa Rosa Creek near Cambria 

11142240 Perry Creek at Cambria 

11142300 San Simeon Creek near Cambria 

11142500 Arroyo de la Cruz near San Simeon 

11142550 San Carpoforo Creek near San Simeon 

11142800 Rat Creek near Lucia 

11143300 Arroyo del Rey at Del Rey Oaks 

11143500 Salinas River near Pozo 

11144000 Toro Creek near Pozo 

11144200 SalslpuedeE Creek near Pozo 

11144600 Salinas River below Salinas Dam, near Pozo 

11145000 Salinas River above Pllltas Creek, near Santa Margarita 

11145500 Salinas River near Santa Margarita 

11147000 Jack Creek near Templeton 

11147040 Santa Rita Creek Tributary near Templeton 

11147600 Buerhuero Creek near Creston 

11147700 Cholame Creek Tributary near Cholame 

11147800 Cholame Creek near Shandon 

11148000 Estrella Creek near Paso Robles 

11148800 Naclmlento River near Bryson 

11149500 Naclmlento River near San Miguel 

11149650 Sulphur Springs Canyon near Jolon 

11150800 Cow Creek near San Ardo 

11151000 San Lorenzo Creek near King City 

11151500 San Lorenzo Creek at King City 

11151670 Arroyo Seco near Greenfield 

11152570 Allsal Creek near Salinas 

11152650 Reclamation Ditch near Salinas 

11152900 Cedar Creek near Bell Station 

11153000 Pacheco Creek near Dunnevllle 

11153040 Pacheco Creek at Dunnevllle 

11153470 Llagas Creek above Chesbro Reservoir, near Morgan Bill 

11153500 Llagas Creek near Morgan Bill 

11153700 Pajaro River near Gilroy 

11153790 Uvas Creek at Sveadal 

11153800 Alec Canyon near Morgan Bill 

11153900 Uvas Creek above Uvas Reservoir, near Morgetn Bill 

11154000 Uvas Creek near Morgan Bill 

11154100 Bodfish Creek near Gilroy 

11154200 Uvas Creek near Gilroy 

11154500 Pajaro River at Sargent 

11156000 San Benito River below McCoy Creek, near Bernandez 

11156450 Willow Creek Tributary near San Benito 

11156700 Pescadero Creek near Faicines 

11157500 Tres Finos Creek near Tres Finos 

11158500 San Benito River near Bolllster 

11158900 Pescadero Creek near Chittenden 

11159150 Corralltos Creek near Corralitos 

11159400 Green Valley Creek near Corralitos 

11159500 Pajaro River at Watsonville 

11159690 Aptos Creek near Aptos 

11159700 Aptos Creek at Aptos 

11159800 West Branch Soquel Creek near Soquel 

11159940 Soctuel Creek near Soquel 

11160020 San Lorenzo River near Boulder Creek 

11160060 Bear Creek at Boulder Creek 

11160070 Boulder Creek at Boulder Creek 

11160200 Newell Creek at Ben Lomond 

11160300 Zayante Creek at Zayante 

11161500 Branclforte Creek at Santa Cruz 

11161570 Majors Creek near Santa Cruz 

11161590 Laguna Creek near Davenport 

11161800 San Vicente Creek near Davenport 

11161900 Scott Creek above Little Creek, near Davenport 

11162000 Scott Creek near Davenport 

11162540 Butano Creek near Pescadero 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 



XIII 



DISCONTINUED GAGING STATIONS— Continued 



Station 
No. 



Station name 



11162600 Purisima Creek near Half Moon Bay 

11162722 Spruce Branch at South San Francisco 

11162900 Sharon Creek near Menlo Park 

111629A0 San Francisquito Creek below Ladera Dam site, 

near Stanford University 

11162950 San Francisquito Creek Tributary near Stanford University 

11163000 Los Trancos Canal near Stanford University 

11163200 Los Trancos Creek Tributary near Stanford University 

11163500 Los Trancos Creek at Stanford University 

11164000 Lagunita Canal at Stanford University 

1116SS00 San Francisquito Creek at Palo Alto 

11166500 Stevens Creek near Cupertino 

11166575 Permanente Creek near Monte Vista 

11166578 West Fork Permanente Creek near Monte Vista 

11167000 Alamitos Creek near Edenvale 

11167660 Ross Creek at San Jose 

11167700 Ross Creek below Jarvis Road, at San Jose 

11168500 Los Gatos Creek below Los Gatos 

11169800 Coyote Creek near Gilroy 

11170000 Coyote Creek near Madrone 

11170500 Coyote Creek at Coyote 

11171500 Coyote Creek near Edenvale 

11172000 Coyote Creek at San Jose 

11172100 Upper Penitencia Creek at San Jose 

11172500 Laguna Creek at Irvington 

11173000 Alameda Creek near Sunol 

11173200 Arroyo Hondo near San Jose 

11173500 Calaveras Creek near Sunol 

11174000 San Antonio Creek near Sunol 

11174500 Alamo Creek at Dublin 

11174600 Alamo Canal near Pleasanton 

11175000 Tassajero Creek near Pleasanton 

11176090 Arroyo Mocho at Liverroore 

11176100 Arroyo Las Fositas above Livermore 

11176140 Altamont Creek near Livermore 

11176145 Arroyo Las Positas at Livermore 

111761S0 Arroyo Las Positas near Livermore 

11176180 Arroyo Las Fositas at El Charro Road, near Pleasanton 

11176200 Arroyo Mocho near Pleasanton 

11176300 Tassajara Creek near Pleasanton 

11176600 Arroyo Valle at Pleasanton 

11179500 Crandal Slough near Centerville 

11180000 Alameda Creek near Sunol 

11180750 Alameda Creek at Union City 

11181000 San Lorenzo Creek at Hayward 

11181004 Castro Valley Creek at Castro Valley 

11181006 Castro Valley Creek at Knox Street, at Castro Valley 

11181300 Peralta Creek at Oakland 

11181330 Temescal Creek above Lake Temescal, at Oakland 

11181335 Caldecott Creek at Lake Temescal, at Oakland 

11181400 Wildcat Creek at Richmond 

11182030 Rhem Creek at San Pablo 

11182100 Pinole Creek at Pinole 

11182400 Arroyo del Hambre at Martinez 

11182800 San Ramon Creek near Walnut Creek 

11183000 San Ramon Creek at Walnut Creek 

11183500 Walnut Creek at Walnut Creek 

11183600 Walnut Creek at Concord 

11183700 Little Pine Creek near Alamo 

11184000 Galindo Creek at Concord 

11184500 Pine Creek at Concord 

11455900 Napa River at Calistoga 

114 55950 Sulphur Creek near St. Helena 

11456500 Conn Creek near Oakville 

11457000 Dry Creek near Napa 

11457500 Dry Creek near Yountvllle 

11458100 Milliken Creek near Napa 

11458200 Redwood Creek near Napa 

11458300 Napa Creek at Napa 

11458350 Tulucay Creek at Napa 

11458500 Sonoma Creek at Agua Caliente 

11459000 Petaluma River at Petaluma 

11459300 San Antonio Creek near Petaluma 

11459800 San Rafael Creek at San Rafael (REVISED RECORDS IN WDR CA-91-2) 

11459830 Irwin Creek at San Rafael 

11460000 Corte Madera Creek at Ross 



Drainage 


Peri 


od 


area 
(mi'') 


of 




record 


4.83 


1959-69 




.70 


1965-69 




0.38 


1959-69 




28.5 


1962-70 




.24 


1959-64 




— 


1931-41 




.42 


1959-66 




7.46 


1931-41 




— 


1931-41 




40.8 


1931-41 




18.1 


1931-59 




3.86 


1984-87 




2.98 


1984-87 




34.5 


1930-58 




5.70 


1962-70 




7.71 


1972-74 




42.6 


1945-53 




109 


1961-82 




196 


1903-12, 


1917-87 


204 


1917-23 




229 


1917-62 




238 


1917 




21.5 


1962-87 




12.5 


1917-19 




37.5 


1912-30 




77.1 


1969-81 




98.7 


1898-1908, 




1911-3C 


) 


37.0 


1912-30, 


1961-65 


38.7 


1915-20 




40.8 


1978-83 




26.8 


1915-19, 


1922-30 


50.8 


1984-86 




7.82 


1972-74 




13.4 


1979-80 




53.3 


1980-86 




64.6 


1912-19, 


1922, 




1924-30 


75.0 


1978-83 




142 


1962-86 




26.8 


1979-83 




171 


1958-86 




— 


1917-18 




639 


1917-19 




653 


1959-73 




37.5 


1940, 1947-83 


.98 


1979-80 




2.20 


1978-80, 


1989-93 


1.67 


1973 




1.74 


1979-81, 


1989-93 


.83 


1980-81 




8.67 


1964-75 




1.49 


1961-90 




10.0 


1939-70, 


1972-77 


15.1 


1965-82 




47.9 


1973-92 




50.8 


1953-73 




79.2 


1953-68 




85.2 


1968-92 




1.22 


1975-89 




7.74 


1955-58 




28.3 


1953-60 




21.9 


1976-83 




4.50 


1966-67 




55.4 


1930-59, 


1971-75 


17.4 


1951-66 




18.7 


1941 




17.3 


1971-83 




9.79 


1958-73 




14.9 


1971-83 




12.6 


1972-83 




58.4 


1955-81 




30.9 


1949-63 




28.9 


1975-81 




1.24 


1972-76 




— 


1972-76 




18.1 


1951-93 





XIV 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



DISCONTINUED GAGING STATIONS--Contlnued 



Station 
No. 



Station name 



Drainage 


Period 




area 
(mi 2) 


of 




record 




A. 69 


1966-73, 


1975- 


86 


.70 


1967-69 






36.6 


1954-60 






*0.1 


1959-84 






15.7 


1962-75 






14.1 


1963-68 






.15 


1959-61 






31.3 


1958-66 






2.89 


1978-79 






655 


1911-13 






43.4 


1961-81 






15.7 


1964-68 






1.19 


1968-69 






56.0 


1974-83 






12.2 


1973-83 






2.24 


1973 






22.3 


1979-90 






12.5 


1959-70 






56.6 


1940-41 






63.1 


1959-66 






161 


1991-92 






98.5 


1962-83 






65.6 


1959-68 






1.53 


1965-68 






14.4 


1961-69 






36.2 


1960-71 






.61 


1969 






12.5 


1964-71 






1.88 


1961-64 






14.9 


1973-77 






37.6 


1951-57 






.81 


1970 






— 


1976-83, 


1988- 


•89 


— 


1976-83, 


1988- 


•89 


43.4 


1963-70 






466 


1911-13 






705 


1951-65 






204 


1968-70 






162 


1959-75 






367 


1952-67 






30.4 


1962-69 






406 


1912-18, 


1920- 


•22 


17.1 


1962-65 






15.2 


1959-69 






95.6 


1956-71 






84.1 


1964-73 






3.83 


1966-68 






1,484 


1912-13, 


1952- 


■66 


25.9 


1962-64 






43.9 


1947-70 






50.3 


1958-74 






74.3 


1966-72 






468 


1912-13, 


1940 




84.1 


1960-65 






85.2 


1954-58, 


1964- 


-74 


36.2 


1958-67 






202 


1912-13, 


1940- 


-51 


.71 


1969 






127 


1954-55, 


1957- 


-60 




1966-72 




134 


1912-13 






44.2 


1958-67 






5.80 


1955-64 






351 


1966-74 






40.4 


1958-64, 


1973- 


-74 


67.7 


1953-58, 


1972- 


-93 


83.0 


1912-13 






16.9 


1980-91 






150 


1981-89 






6.07 


1979-91 






7.78 


1980-82, 


1984- 


-89 


185 


1971-81 






3.46 


1974-82, 


1985- 


-89 


1.74 


1963-66 






18.6 


1953-79 






30 


1922 






178 


1922, 1952-60 





11460100 Arroyo Corte Madera del Presidio at Mill Valley 

11460160 Morses Creek at Bolinas 

11460500 Nicaslo Creek at Point Reyes Station 

11460800 Walker Creek near Toaiales 

11460920 Salmon Creek at Bodega 

11460940 Russian River near Redwood Valley 

11461400 East Fork Russian River Tributary near Potter Valley 

11462700 Feliz Creek near Hopland 

11463160 Big Sulphur Creek near Mlddletown 

11463500 Russian River at Geyserville 

11463900 Maacama Creek near Kellogg 

11463940 Franz Creek near Kellogg 

11464050 Dry Creek Tributary near Hopland 

11464400 Dry Creek near Yorkville 

11464860 Warm Springs Creek near Astl 

11465050 Dutcher Creek near Astl 

11465150 Pena Creek near Geyserville 

11465800 Santa Rosa Creek near Santa Rosa 

11466200 Santa Rosa Creek at Santa Rosa 

11467200 Austin Creek near Cazadero 

11467510 South Fork Gualala River near the Sea Ranch 

11467600 Garcia River near Point Arena 

11467800 Rancheria Creek near Boonville 

11467850 Soda Creek Tributary near Boonville 

11468010 Albion River near Coniptche 

11468070 South Fork Big River near Comptche 

11468150 Warner Creek near Fort Bragg 

11468540 Pudding Creek near Fort Bragg 

11468850 Dunn Creek near Rockport 

11468990 Boneydew Creek near Honeydew 

11469500 North Fork Mattole River at Petrolia 

11469800 Cold Creek Tributary near Elk Creek 

11471105 Potter Valley Irrigation Canal E5 near Potter Valley 

11471106 Potter Valley Irrigation Canal E6 near Potter Valley 
11471800 Tomki Creek near Willlts 

11472000 Eel River at Hearst 

11472500 Eel River above Dos Rios 

11472800 Middle Fork Eel River above Black Butte River, near Covelo 

11472900 Black Butte River near Covelo 

11473000 Middle Fork Eel River below Black Butte River, near Covelo 

11473100 Wlllianis Creek near Covelo 

11473500 Middle Fork Eel River near Covelo 

11473530 Mill Creek below Alder Creek, near Covelo 

11473600 Short Creek near Covelo 

11473700 Mill Creek near Covelo 

11473800 Elk Creek near Hearst 

11473980 Goforth Creek at Dos Rios 

11474000 Eel River below Dos Rios 

11474400 Bulls Creek near Covelo 

11475500 South Fork Eel River near Branscomb 

11475700 Tenmile Creek near Laytonvllle 

11475940 East Branch South Fork Eel River near Garberville 

11476000 South Fork Eel River at Garberville 

11476700 Larabee Creek near Holmes 

11477500 Van Duzen River near Dinsmore 

11477700 Little Van Duzen River near Bridgeville 

11478000 Van Duzen River at Bridgeville 

11478400 Van Duzen River Tributary near Bridgeville 

11479000 Yager Creek near Carlotta 

11479500 Yager Creek at Carlotta 

11479700 Elk River near Falk 

11480000 Jacoby Creek near Freshwater 

11480750 Mad River near Kneeland 

11480800 North Fork Mad River near Korbel 

11481500 Redwood Creek near Blue Lake 

11482000 Redwood Creek near Korbel 

11482110 Lacks Creek near Orlck 

11482120 Redwood Creek above Panther Creek, near Orlck 

11482125 Panther Creek near Orlck 

11482130 Coyote Creek near Crick 

11482200 Redwood Creek at South Park Boundary, near Orlck 

11482468 Little Lost Man Creek at Site No. 2, near Orick 

11488700 Dry Lake Tributary at Perez 

11489500 Antelope Creek near Tennant 

11490000 Antelope Creek near Macdoel 

11490500 Butte Creek near Macdoel 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



XV 



DISCONTINUED GAGING STATIONS— Continued 



Station 
No. 



Station name 



Drainage 


Period 


area 
(ml 2) 


of 


record 


14.6 


1933-59 


4,317 


1924-61 


89.8 


1965-71 


48.2 


1958-78 


673 


1912-13, 1917-21 




1924-33 


106 


1960-65 


19.7 


1970-73 


49.5 


1970-73 


57.5 


1911 


110 


1960-74 


41.5 


1959-60 


12.0 


1957-60 


.99 


1966-73 


69.8 


1959-67 


17.7 


1957-60 


804 


1912-13 


7,024 


1912 


90.4 


1957-64 


9.46 


1961-64 


252 


1957-65 


203 


1959-64 


56.1 


1958-65 


74.6 


1959-65 


107 


1911-13, 1958-66 


300 


1911-13 


812 


1981-91 


48.4 


1959-69 


71.6 


1957-67 


1,014 


1944-51 


173 


1928-29, 1959-69 


1,733 


1912-13 


208 


1960-65 


342 


1956-65 


86.7 


1957-65 


27.1 


1961, 1963-67 


932 


1912-13 


40.9 


1959-74 


3.56 


1967-69 


131 


1912-17, 1959-65 


158 


1912-13 


33.3 


1957-62 


.92 


1962-66 



11512000 Fall Creek at Copco 

11512500 Klamath River below Fall Creek, near Copco 

11516600 Cottonwood Creek at Hombrook 

11516900 Little Shasta River near Montague 

11517000 Shasta River near Montague 

11517800 Beaver Creek near Klamath River 

11517900 East Fork Scott River below Houston Creek, near Callahan 

11517950 East Fork Scott River above Kangaroo Creek, near Callahan 

11518000 East Fork Scott River near Callahan 

11518050 East Fork Scott River at Callahan 

11518200 South Fork Scott River near Callahan 

11518300 Sugar Creek near Callahan 

11518310 Cedar Gulch near Callahan 

11518600 Moffett Creek near Fort Jones 

11519000 Shackleford Creek near Mugginsville 

11520000 Scott River near Scott Bar 

11521000 Klamath River near Happy Camp 

11522200 Elk Creek near Happy Camp 

11522260 Ti Creek near Somes Bar 

11522300 South Fork Salmon River near forks of Salmon 

11522400 North Fork Salmon River near forks of Salmon 

11523030 Red Cap Creek near Orleans 

11523050 Bluff Creek near Weitchpec 

11523700 Coffee Creek near Trinity Center 

11524000 Trinity River near Trinity Center 

11525655 Trinity River below Limekiln Gulch, near Douglas City 

11525800 Weaver Creek near Douglas City 

11525900 Browns Creek near Douglas City 

11526000 Trinity River near Douglas City 

11527400 New River at Denny 

11528000 Trinity River near China Flat 

11528100 South Fork Trinity River at Forest Glen 

11528200 South Fork Trinity River near Byampom 

11528400 Hayfork Creek near Hayfork 

11528440 Big Creek near Hayfork 

11529500 South Fork Trinity River near China Flat 

11529800 Willow Creek near Willow Creek 

11530150 Mareep Creek near Weitchpec 

11531000 Middle Fork Smith River at Gasquet 

11531500 North Fork Smith River at Gasquet 

11532700 Rowdy Creek at Smith River 

11533000 Lopez Creek near Smith River 



DISCONTINUED LAKES AND RESERVOIRS 

The following continuous-record lake stations in California have been discontinued, 
collected and are stored in WATSTORE for the period of record shown for each location. 



Daily records were 



Station 
No. 



Station name 



Drainage 

area 

(mi 2) 



Period 

of 
record 



11144500 Santa Margarita Lake near Pozo 

11166740 Calero Reservoir near New Almaden 

11461800 Lake Mendocino near Ukiah 

11464900 Lake Sonoma near Geyserville 



112 

6.93 
105 
130 



1945-86 
1936-85 
1966-90 
1984-90 



DISCONTINUED WATER-QUALITY STATIONS 

The following continuous water-quality stations in California have been discontinued. Daily records were 
collected and are stored in WATSTORE for the period of record shown for each location. 



Station 
No. 



Station name 



Drainage 
area 
(mi 2) 



Type 

of 

record 



Period 

of 
record 



11141150 Arroyo Grande above Phoenix Creek, near Arroyo Grande 



13.4 



WQ,S,T 1967-73, 1977, 1990 



XVI 



WATER RESOURCES DATA--CALIFORmA, WATER YEAR 1993 
DISCONTINUED WATER-QUALITY STATIONS- -Continued 



Station 
No. 



Station name 



Drainage 
area 
(mi 2) 



Type 


Period 


of 




of 


record 


record 


WQ,S,T 


1968-72, 


1977 


WQ 


1988-89 




WQ 


1988-89 




WQ 


1988-89 




WQ,T 


1966-79 




WQ 


1954-66 




T 


1968-72 




S 


1968-72 




WQ,S 


1963-66, 


1990 


s 


1990 




T.S 


1959, 1961-71 


T 


1972-73 




WQ 


1963-66 




T.S 


1959, 1961-62. 




1964-65 


T 


1966-73 




T,S 


1962, 1965 


WQ.S 


1950, 1958, 1962-66 




1972-75, 1977. 




1980-81, 1990 


WQ.S 


1972-75, 
1992 


1977, 1990 


S 


1963-75, 


1978-84 


B,C,T 


1977-81 




MQ,B,C. 


1950-54, 


1958-79. 


T,S 


1986, 


1990 


S 


1986, 1990 


T 


1972-78 




WQ,S 


1979-91 




WQ,S 


1980-87. 


1989-91 


T,S 


1966-76 




WQ,B,C 


1952-92 




T,S 






S 


1976-77, 


1980,81 


WQ,T,S 


1952-79, 


1990-93 


C.S 


1973-77, 


1980-81 


WQ,S 


1973-77 




WQ,S,T 


1970-74, 


1976-77 


WQ,S,T 


1906-07, 


1952-82. 




1986, 


1989-93 


WQ,S,T 


1965-80, 


1986, 




1989-93 


S 


1986, 1989-93 


S 


1990 




s 


1966-76 




s 


1965-69 




T.S 


1984-87 




T,S 


1985-86 




WQ 


1986-90 




WQ,S 


1985-91 




WQ,S 


1980-91 




WQ 


1952-66. 


1980-87, 




1989-91 


WQ 


1980-87. 


1989-91 


WQ.S 


1979-91 




WQ 


1972-73 




T 


1973-77 




T 


1973-75 




T 


1974-77 




T.S 


1965-76 




WQ.S 


1980-88, 


1990-91 


WQ,S 


1979-88, 


1990-91 


C 


1979-83 




C 


1979-83 




C 


1979-80 




c 


1980-83 




c 


1980-83 




c 


1980-84 




c 


1979-83 




T.S 


1975-79 




S 


1963, 1965 


S 


1966-67 




T.S 


1975-79 




T 


1960-63 




C 


1979-83 




C 


1975-86 




WQ.S.T, 


C 1906, 1952-73, 




1975- 


93 



near Bryson 
near Bradley 



11141280 Lopez Creek near Arroyo Grande 

11142200 Santa Rosa Creek near Cambria 

11142240 Ferry Creek at Cambria 

11142300 San Simeon Creek near Cambria 

11143000 Big Sur River near Big Sur 

11143250 Carmel River near Carmel 

11147040 Santa Rita Creek Tributary near Templeton 

11147070 Santa Rita Creek near Templeton 

11147500 Salinas River at Paso Robles 

11148500 Estrella River near Estrella 

11148800 Nacimiento River near Bryson 

11148900 Nacimiento River below Sapaque Creek, 

11149400 Nacimiento River below Nacimento Dam, 

11149700 San Antonio River at Sam Jones Bridge 

11149900 San Antonio River near Lockwood 

11150000 San Antonio River at Pleyto 

11150500 Salinas River near Bradley 



11151700 Salinas River at Soledad 

11151870 Arroyo Seco near Greenfield 

11152300 Salinas River near Chualar 

11152500 Salinas River near Spreckels 

11152S40 El Tore Creek near Spreckels 

111S3470 Llagas Creek above Chesbro Reservoir, near Morgan Hill 

11153500 Llagas Creek near Norgan Hill 

11153555 Llagas Creek at San Martin 

11153900 Uvas Creek above Uvas Reservoir, near Morgan Hill 

11159000 Pajaro River at Chittenden 

11159200 Corralitos Creek at Freedom 

11160000 Soquel Creek at Soquel 

11160020 San Lorenzo River near Boulder Creek 

11160070 Boulder Creek at Boulder Creek 

11160300 Zayante Creek at Zayante 

11160500 San Lorenzo River at Big Trees 

11162500 Fesadero Creek near Pesadero 

11162570 San Gregorio Creek at San Gregorio 

11162630 Pllarcitos Creek at Half Moon Bay 

11162720 Colma Creek at South San Francisco 

11162722 Spruce Branch at South San Francisco 

11166575 Permanente Creek near Monte Vista 

11166578 West Fork Permanente Creek near Monte Vista 

11166710 Arroyo Calero above Calero Reservoir, near New Almaden 

11166900 Alamitos Creek near New Almaden 

11167500 Guadalupe Creek at Guadalupe 

11168000 Los Gatos Creek at Los Gatos 

11168800 Los Gatos Creek at Lincoln Avenue, at San Jose 

11169000 Guadalupe River at San Jose 

11169500 Saratoga Creek at Saratoga 

11169580 Calabazas Creek Tributary No. 1 at Mt. Eden Road 

11169600 Prospect Creek above Saratoga Golf Course, near Saratoga 

11169616 Calabazas Creek at Rainbow Drive, near Cupertino 

11169800 Coyote Creek near Gilroy 

11169970 Coyote Creek below Leroy Anderson Dam, near Madrone 

11171500 Coyote Creek near Edenvale 

11174600 Alamo Canal near Pleasanton 

11176000 Arroyo Mocho near Livorroore 

11176140 Altamont Creek near Livermore 

11176145 Arroyo Las Positas at Livermore 

11176180 Arroyo Las Positas at El Charro, near Pleasanton 

11176200 Arroyo Mocho near Pleasanton 

11176300 Tassajara Creek near Pleasanton 

11176350 Arroyo de la Laguna above Arroyo Valle, near Pleasanton 

11176400 Arroyo Valle below Lang Canal, near Livermore 

11176500 Arroyo Valle near Livermore 

11176600 Arroyo Valle at Pleasanton 

11176900 Arroyo de la Laguna above bridge, near Pleasanton 

11177000 Arroyo de la Laguna near Pleasanton 

11177200 Vallecitos Creek at Sunol 

11179000 Alameda Creek near Niles 



95 
2 



20.9 
12.5 
22.9 
26.3 
46.5 

246 

2 

18 

390 

922 

147 

162 

329 

204 

217 

277 

2,535 



3.563 

113 
4.042 
4.156 

31.9 

9.63 
19.6 
28.2 
21 
1,186 

27.8 

40.2 

6.17 
11.3 
11.1 
106 

45.9 

SO. 9 
27.1 

10.8 
1.68 
3.86 
2.98 
3.14 
31.8 
12. S 
39.0 

48.4 

146 

9.22 

.37 

.27 

3.98 

109 

195 

229 
40.8 
38.2 
13.4 
S3. 3 
75.0 

142 
26. 

224 

130 

147 

171 



.8 



405 

7.48 
633 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



XVII 



DISCONTINUED WATER-QUALITY STATIONS— Continued 



Station 
No. 



Station name 



Drainage 
area 
(mi^) 



Type 


Period 


of 


of 




record 


record 


S 


1981, 1986, 1989, 




1992 




T,S 


1979 




T,S 


1989-93 




WQ,S 


1979-81 




S 


1978-80 




s 


1961-62 




WQ,C,S, 


T 1971, 1973-93, 




1977-93 


S 


1978-80 




S 


1988-89 




I,S 


1967, 1969-70 


T.S 


1989-90 




T,S 


1964-75 




WQ.S.B, 


T 1964-68, 


1977-79 




1990-92 


S 


1965-68 




WQ,S,B 


1953-55, 


1964-68 




1973-82 


WQ.T.S 


1951-79, 


1989-93 


S 


1964-68 




T.S 


1978-79 




S 


1967-68 




WQ 


1951-66, 


1980 


T 


1965-79 




S 


1979-86 




WQ,S,T 


1964-86 




C,B 


1974-81 




T 


1964-78 




T 


1965-73 




S 


1964-68 




S 


1967-77 




s . 


1967-70 




T.S 


1959, 1962-82 


T.S 


1966, 1969-70 


T.S 


1964-66, 


1968-75 


T.S 


1961-63, 


1968-79 


T 


1965-73 




c.s 


1967-69 




T.S 


1973-75 




T.S 


1973-75 




S 


1966-76 




T.S 


1973-76 




T.S 


1961-70 




T 


1968-79 




S 


1981 




s 


1960-80 




B,C,T 


1958-82 




T 


1966-74 




T 


1961-65 




T 


1969 




T 


1966-74 




T 


1973-76 




S 


1960-74 




MQ 


1974-75 




C.S 


1975-76, 


1978-91 


S 


1988-89 




T.S 


1979-91 




T.S 


1980 




T 


1974-81 




WQ,S 


1974-76, 


1978-82 




1985-89 


WQ 


1959-66, 


1973-81 


T 


1965-71 




s 


1967-79 




WQ.T.S 


1951-83 




S 


1985-89 




T.S 


1981-91 




T.S 


1963 




T 


1961-65 




I 


1961-74 




S 


1967-70, 


1981-82 


T.S 


1959-67, 


1981-82 


S 


1960-79 




T.S 


1982-85 




T 


1966-78 




B.C.! 


1966-81 





11180940 

11180965 
11181040 
11181330 
11181390 
11456000 
11458000 

11460000 
11460015 
11460170 
11460600 
11460920 
11461000 

11461500 
11462000 

11462500 
11463000 
11463160 
11463200 
11464000 
11464500 
11465150 
11465200 
11467000 
11467600 
11468600 
11471000 
11472150 
11472200 
11472500 
11472800 
11472900 
11473000 
11473800 
11473900 
11474500 
11474700 
11475000 
11475100 
11475500 
11475560 
11476500 
11476600 
11477000 
11477500 
11477700 
11480700 
11480750 
11480780 
11481000 
11481500 
11482110 
11482120 
11482125 
11482130 
11482200 
11482468 

11482500 
11516600 
11523000 
11525500 
11525550 
11525655 
11526500 
11528200 
11528500 
11528700 
11529000 
11530000 
11530020 
11530300 
11530500 



Cull Creek Tributary No. 4 above Cull Creek Reservoir, .45 

near Castro Valley 

Cull Creek below Cull Creek Dam, near Castro Valley 6.37 

San Lorenzo Creek at San Lorenzo 44.6 

Temescal Creek above Lake Temescal, at Oakland 1.74 

Wildcat Creek at Vale Road, at Richmond 7.79 

Napa River near St. Helena 81.4 

Napa River near Napa 218 

Corte Madera Creek at Ross 18.1 

Corte Madera Creek at College Avenue, at Kentfield 18.2 

Pine Creek at Bolinas 7.83 

Lagunitas Creek near Point Reyes 81.7 

Salmon Creek at Bodega 15.7 

Russian River near Ukiah 100 

East Fork Russian River near Calpella 92.2 

East Fork Russian River near Ukiah 105 

Russian River near Hopland 362 

Russian River near Cloverdale 503 

Big Sulphur Creek near Middletown 2.89 

Big Sulphur Creek near Cloverdale 85.5 

Russian River near Healdsburg 793 

Dry Creek near Cloverdale 87.8 

Pena Creek near Geyserville 22.3 

Dry Creek near Geyserville 162 

Russian River near Guemeville 1.338 

Garcia River near Point Arena 98.5 

Middle Fork Ten Mile River near Fort Bragg 32.9 
Potter Valley Powerhouse intake near Potter Valley 

Eel River near Dos Rios 528 

Outlet Creek near Longvale 161 

Eel River above Dos Rios 705 
Middle Fork Eel River above Black Butte River, near Covelo 204 

Black Butte River near Covelo 162 
Middle Fork Eel River below Black Butte River, near Covelo 367 

Elk Creek near Hearst 84.1 

Middle Fork Eel River near Dos Rios 745 

North Fork Eel River near Mine 248 

Chamise Creek near Island Mountain 22.6 

Eel River at Fort Seward 2,107 

Dobbyn Creek near Fort Seward 61.4 

South Fork Eel River near Bransconib 43.9 

Elder Creek near Branscorob 6.50 

South Fork Eel River near Miranda 537 

Bull Creek near Weott 28.1 

Eel River at Scotia 3,112 

Van Duzen River near Dinsmore 85.2 

Little Van Duzen River near Bridgeville 36.2 

Maple Creek near Blue Lake 12.1 

Mad River near Kneeland 351 

Mad River near Blue Lake 393 

Mad River near Areata 485 

Redwood Creek near Blue Lake 67.7 

Lacks Creek near Orick 16.9 

Redwood Creek above Panther Creek, near Orick ISO 

Panther Creek near Orick 6.07 

Coyote Creek near Orick 7.78 

Redwood Creek at South Park Boundary, near Orick 185 

Little Lost Man Creek at Site No. 2, near Orick 3.46 

Redwood Creek at Orick 277 

Cottonwood Creek at Hombrook 89 . 8 

Klamath River at Orleans 8,475 

Trinity River at Lewiston 719 

Grass Valley Creak near French Gulch 7.93 

Trinity River below Limekiln Gulch, near Douglas City 812 

North Fork Trinity River at Helena 151 

South Fork Trinity River near Hyampom 342 

Hayfork Creek near Hyampom 378 

South Fork Trinity River below Hyampom 764 

South Fork Trinity River near Salyer 898 

Trinity River at Hoopa 2,853 

Supply Creek at Hoopa 15.8 

Blue Creek near Klamath 120 
Klamath River near Klamath 12,100 



XVIII 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 
DISCONTINUED WATER-QUALITY STATIONS- -Continued 



Station 
No. 



Station name 



Drainage 
ares 
(ml^) 



Type 

of 

record 



Period 

of 
record 



11S32000 
11532500 



South Fork Smith River near Crescent City 
Smith River near Crescent City 



11532620 Mill Creek near Crescent City 



3S33391210S3900 
3S3«06121061100 
3536351210A3101 
371057121472501 
375658122324000 

37S70112232A200 

37570A122324200 

375710122324000 

375711122324600 

375712122325100 

375712122325200 



Santa Rosa Creek 
Santa Rosa Creek 
San Simeon Creek 
Calero Reservoir 
Corte Madera Cre 

at Kentfleld, 
Corte Madera Cre 

at Kentfleld 
Corte Madera Cre 

at Kentfleld 
Corte Madera Cre 

at Kentfleld, 
Corte Madera Cre 

at Kentfleld. 
Corte Madera Cre 

at Kentfleld 
Corte Madera Cre 

at Kentfleld 



on Highway 1 Bridge, at Cambria 
at Wlndson Boulevard, near Cambria 
at Palmer Flats, near Cambria 
at dam, near New Almaden 

ek near College Avenue, 

at Cross Section 

ek near College Avenue, 

at Cross Section 1 

ek near College Avenue, 

at Cross Section 2 

ek near College Avenue, 

at Cross Section 3 

ek near College Avenue, 

at Cross Section 4 

ek near College Avenue, 

at Cross Section 5 

ek near College Avenue, 

at Cross Section 6 



291 
61« 

28.6 
46.6 
♦ 7.1 
23.1 
6.93 



T,S 
WQ.C, 
S,T 
T 

WQ 
WQ 
WQ 
MQ.B 
S 

S 

S 

S 

S 



1978-79 
1952-93 

1974-80 

1988-89 

1988-89 

1988-89 

1978-79, 

1988-89 

1988-89 

1988-89 

1990 

1988-89 

1988-89 

1988-89 



1984-91 



Type of record: WQ (Water quality); B (Biological); C (Conductivity); T (Temperature); S (Sediment). 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 

VOLUME 2--PACIFIC SLOPE BASINS FROM ARROYO GRANDE 
TO OREGON STATE LINE EXCEPT CENTRAL VALLEY 



By J.R. Palmer, M.F. Friebel, L.F. Trujillo, and K.L. Markham 



INTRODUCTION 



The Water Resources Division of the U.S. Geological Survey, in cooperation with State and Federal agencies, 
obtains a large amount of data pertaining to the water resources of California each water year. These data, 
accumulated during many water years, constitute a valuable database for developing an improved understanding of the 
water resources of the State. To make these data readily available to interested parties outside the U.S. 
Geological Survey, the data are published annually in this report series entitled "Water Resources Data — 
California. " 

This volume of the report includes records on surface water in the State. Specifically, it contains 
(1) discharge records for 119 streamflow-gaging stations, 1 low-flow partial-record streamflow station, and 
6 miscellaneous measurement stations; (2) stage and contents records for 6 lakes and reservoirs; (3) precipitation 
records for 3 stations; and (4) water-quality records for 31 streamflow-gaging stations. Records Included for 
stream stages are only a small fraction of those obtained during the water year. 

The series of annual reports for California began with the 1961 water year with a report that contained only 
data relating to the quantities of surface water. For the 1964 water year, a similar report was introduced that 
contained only data relating to water quality. Beginning with the 1975 water year, the report format changed to 
include data on quantities of surface water, quality of surface and ground water, and ground-water levels. 
Beginning with the 1985 water year, a separate volume for ground-water levels and quality was published for 
California. 

Prior to introduction of this series and for several water years concurrent with it, water-resources data for 
California were published in U.S. Geological Survey Water-Supply Papers. Data on stream discharge and stage and on 
lake or reservoir contents and stage, through September 1960, were published annually under the title "Surface- 
Water Supply of the United States, Parts 10 and 11." For the 1961 through 1970 water years, the data were 
published in two 5-year reports. Data on chemical quality, temperature, and suspended sediment for the 1941 
through 1970 water years were published annually under the title "Quality of Surface Waters of the United States," 
and water levels for the 1935 through 1974 water years were published under the title "Ground-Water Levels in the 
United States." These Water-Supply Papers may be consulted in public libraries of the principal cities of the 
United States and may be purchased from U.S. Geological Survey, Map Distribution, Box 25286, MS 306, Denver Federal 
Center, Denver, CO 80225. 

Publications similar to this report are published annually by the U.S. Geological Survey for all States. Each 
report has an identification number consisting of the two-letter State abbreviation, the last two digits of the 
water year, and the volume number. For example, this volume is identified as "U.S. Geological Survey Water-Data 
Report CA-93-2." For archiving and general distribution, the reports for 1971-74 water years also are Identified 
as water-data reports. These water-data reports are for sale in paper copy or in microfiche by the National 
Technical Information Service, U.S. Department of Comnerce, Springfield, VA 22161. Beginning with the 1990 water 
year, all water-data reports also will be available on Compact Dise--Read Only Memory (CD-ROM). All data reports 
published for the current water year for the entire Nation, including Puerto Rico and the Trust Territories, will 
be reproduced on a single CD-ROM disc. 

Additional information, including current prices, for ordering specific reports may be obtained from the 
District Office at the address given on the back of the title page or by telephone (916) 978-4668. A limited 
number of CD-ROM discs will be available for purchase from U.S. Geological Survey, Earth Science Information 
Center, Open-File Reports Section, Box 25286, MS 517, Denver Federal Center, Denver, CO 80225. 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 



COOPERATION 

The U.S. Geological Survey and organizations of the State of California have had cooperative agreements for 
the systematic collection of records since 1903. Organizations that supplied data are acknowledged in station 
descriptions. Organizations that assisted in collecting data through cooperative agreement with the Survey are: 

Alameda County Flood Control and Water Conservation District, Donald Labelle, Director of Public Works. 

Alameda County Water District, James D. Beard, General Manager. 

California Department of Boating and Waterways, William B. Ivers, Director. 

California Department of Parks and Recreation, Henry R. Agonia, Director. 

California Department of Water Resources, David N. Kennedy, Director. 

Contra Costa County Flood Control and Water Conservation District, Milton Kubicek, Deputy Chief. 

Humboldt Bay Municipal Water District, Arthur Bolli, General Manager. 
Marin Municipal Water District, Ronald L. Johnson, General Manager. 
Mendocino County Water Agency, Dennis Jackson, Hydrologist. 
Monterey County Water Resources Agency, William Hurst, General Manager. 
Monterey Peninsula Water Management District, James Cofer, General Manager. 

San Benito County Water District, William Rupert, District Manager. 

San Francisco Water Department, John Mullane, General Manager. 

San Luis Obispo County Engineering Department, Clinton Milne, County Engineer. 

San Mateo County, Robert Sans, Director of Public Works. 



Santa Clara Valley Water District, Leo F. Coumoyer, Water Supply Manager. 
Santa Cruz, city of. Water Department, Terry Tompkins, Deputy Director. 
Santa Cruz County Flood Control and Water Conservation District, Planning 

Manager. 
Scotts Valley Water District, Jon Sansing, General Manager. 

Sonoma County Planning Department, Jim Olmsted, Assistant Planning Director. 
Sonoma County Water Agency, Robert F. Beach, General Manager. 

Assistance in the form of funds or services was given by the Corps of Engineers, 
Service, U.S. Department of the Interior. 



Department, Ken Hart, Program 



U.S. Army; and National Park 



The following organizations aided in collecting records: Pacific Gas and Electric Company; PacifiCorp, 
Independent Hydro Developers, Malacha Power Project, Nelson Creek Power Company, Highland Hydro Constructors, 
Synergic, Inc., and STS Hydropower. 

SUmARY OF HYDROLOGIC CONDITIONS 

Surface Water 

As Is coomon in California, streamflow varied greatly in the 1993 water year — month by month and regionally. 
The variations are related to differences in precipitation, temperature, topography, and geology. Runoff during 
the 1993 water year in the area covered by this volume was 164 percent of the 1961-90 median based on 
10 representative streamflow records. Total runoff, in percent of median, at selected stations in California is 
shown in figure 1. Runoff ranged from 111 percent of median at Smith River near Crescent City (station 11532500) 
to 280 percent of median at Santa Rita Creek near Templeton (station lll'i7070). In figure 2, monthly mean 
discharge in the 1993 water year is compared with the 1961-90 median, maximum, and minimum monthly mean discharge 
at four representative gaging stations. In addition, a comparison of monthly precipitation in the 1993 water year 
and the long-term average is shown in figure 2. Annual departure from 1961-90 mean discharge for four selected 
gaging stations is shown in figure 3. A comparison of peak discharge for the 1993 water year with peaks for period 
of record for selected stations is given in table 1. A comparison of low-flow data for various years is shown In 
table 2. 

Precipitation in the area covered by this volume was slightly above normal during the 1993 water year. 
Precipitation, based on seven representative raingages, was 129 percent of the long-term average. There were 
significant storms In December and January that produced above-average precipitation throughout the region. 

Table 1. Comparison of peak discharge for 1993 water year with 
those for period of record for selected stations 



Station 
No. 



Station name 



1993 water year 



Date 


Peak 

discharge 

(ft^/s) 


Jan. ii 
Jan. 20 
Jan. 21 
Jan. 20 


18,800 

7,930 

290,000 

76,400 



Period of record 



Water 
year 



Peak 
discharge 

(ft^/B) 



11152000 Arroyo Seco near Soledad 

11456000 Napa River near St. Helena 

11477000 Eel River at Scotia 

11532500 Smith River near Crescent City 



1958 
1986 
1965 
1965 



28,300 

16,900 

752,000 

228,000 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 



Q11 

11532500 

11530000( 

eureka/ 

(^ 

11477000^ 



EXPLANATION 



'1 ORS Runoff at representative gaging stations, 
JiS/ in percent of median for the 1961-90 

11522500 water years 



Area included in this volume 
Boundary of volume areas 



11467000 V^ _ ^ ^ , 

-SACRAMENTO ,,,i1)5^ 



SAN FRANCISCOj 

11169501 




11160500 
11152000 

36° 



11147070 



11124500 

340 ^ci^^U^Oo 



100 MILES 
I 



100 KILOMETERS 



Figure 1. Runoff, in percent of median, for the 1993 water year. 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



2,500 

1,000 



1 1 1 520000 Arroyo Seco near Soledad 
Drainage area, 244 square miles 



o 

LU 
CO 

QC 
LU 
O. 

t 
LU 
LL. 

O 

CD 



10 



< 
X 

o 

S« 0.1 

o 



0.01 



\,„ \. 




Median monthly mean 

discharge 1961-90 
Maximum monthly mean ' 

discharge 1961-90 \ 
Minimum monlhly mean \ 

discharge 1961-90 



_L 



100,000 



10,000 



1,000 



100 



10 



11477000 Eel River at Scotia 
Drainage area, 3,113 square miles 



1 ' 

■ / 


> i,„ 


1 1 1 1 1 1 I I , 


// 

• M 

• m 

'r 




■ 







o s: 



>- 



Precipitation gage, Salinas AP 






I- O 

51 z 







1— >ozooa:cc>-Lij>-c3t" 

CJ)0'-1-'<ILjj<i:Q_<CZ — I— )Q_ 

Precipitation gage. Eureka 

-i 1 1 1 r 




1 1 456000 Napa River near St. Helena 
Drainage area, 81.4 square miles 




25,000 



10,000 



1 1 532500 Smith River near Crescent City 
Drainage area, 609 square miles 




1,000 : 



Precipitation gage, Crescent City 7 NE 

-i 1 1 1 1 r 




Figure 2. Discharge and precipitation during water year 1993 
gaging stations. Precipitation data from National Oceanic 
CLimatological Data, annual suimary: v, 97, 



and long-term average at four representative 
and Atmospheric Administration, 1993, 



WATER RESOURCES DATA- -CALIFORNIA. WATER YEAR 1993 



o 
o 


-200 


LU 




CO 


200 


cc 




LU 




Q. 


150 


1— 




LU 




LU 




Li- 
es 


100 


CO 




=3 


50 


z 




LU 





CD 




CC 




< 


-50 


o 




CO 




Q 


-100 


<r 


10,000 


LU 




S 


8,000 


o 




CD 


6,000 


^ 




CD 

CT> 


4,000 


S 


2,000 


o 





cc 




u_ 

LU 


-2,000 


cc 


-4,000 


1— 


-6,000 


< 




Q- 

LU 


-8,000 


O 

—1 


■10,000 


< 
Z3 


3,200 


2 




< 


2,400 




1,600 




800 




-800 
-1,600 
-2,400 



3,200 



1 I ' '-' ■ 1 

: 1 1 532500 Smith River near Crescent 


City 


A 


T-i-ry 
n 


Tfl 


' ' ' 1 1 ' ' 

nn nm 


n 


1 


n : 


u 

' 1 1 1 . . . 


hJ 


i^ 


' 


. • 1 




u^ 




'- 


:" 

J U 

1 





1900 1910 1920 1930 1940 1950 1960 

WATER YEAR 



1970 



1980 



1990 



2000 



Figure 3. Annual departure from 1961-90 mean discharge for 
period of record at selected gaging stations. 



WATER RESOURCES DATA— CALIFORNIA. WATER YEAR 1993 



Table 2. Comparison of 7-day and 1-day low flow for 1993 water year with 7-day, 1-day, and 
mininnm daily flow for 30-year base period 1961-90 for selected stations 



Station 
No. 



Station name 



7-daY low flow (ff'/s) 
1993 Base 

water period 

year 1961-90 



1-dav low flow (ff'/s) 
1993 Base 

water period 
year 1961-90 



Period of record 
Minimum 
Water dally 
year (ft^/s> 



11152000 Arroyo Seco near Soledad 

11AS6000 Napa River near St. Helena 

11477000 Eel River at Scotia 

11532500 Smith River near Crescent City 



.18 



67 
184 







25 

163 



.16 



60 
181 







25 

160 



Several 
Several 
1924 
1964 







12 

160 



Water Quality 

Water samples collected at seven NASQAN stations and one Hydrologic Benchmark station reported in this volume 
were analyzed for water-quality constituents. Dissolved-solids concentrations generally decreased from the 
previous year and were largest at Napa River near Napa (station 11458000), where the median concentration was 
285 milligrams per liter. The smallest concentration was in water sampled from the Smith River near Crescent City 
(station 11532500), where the median concentration was 54 milligrams per liter. Figure 4 shows the monthly mean 
dissolved-solids concentrations during water year 1993 compared with long-term mean dissolved-solids concentrations 
at two selected stations. No chemical-constituent concentrations exceeded water-c[uality criteria recooniended by 
the U.S. Environmental Protection Agency. 

The largest densities of fecal-coliform (23,500 colonies per 100 milliliters) and fecal streptococcus bacteria 
(36,000 colonies per 100 milliliters) were in water samples collected from Russian River near Guemeville (station 
11467000). 



1 1 1 52300 Salinas River near Chualar 



1 1 530500 Klamam River near Klamatln 



(r 

LU 



Ly 

M 

< 

DC 



5 
z 

w 

Q 

—J 

o 
w 

Q 



O 

w 
w 

Q 



1,020 
920 
820 
720 

620 
520 
420 

320 
220 
120 



T Maximum 




' 1 Mean 1968-92 




-I- Minimum 


■ 


a Monthly Mean 1993WY 

1 




- 


































( 


» 




- 


- 










1 


1 1 






- 








1 
















( 


, ' 


1 


) 


> ( 


1 




1 


> 




" 


' ' 




( 


1 






I 


1 ' 

( 


1 
1 

1 i 




> 
1 - 


J 


^ 





220 

200 
180 

160 
140 
120 
100 

80 h 

60 



T Maximum 
1 1 Mean 


1951-92 


1 1 






" •'- Minimum 








- 


D Monthly Mea 


1 1993 VTY 






. 


- 










- 


- 












- 


( 


1 
1 


1 










1 1 

i 1 ' 


_ 












y I 


1 




- 




1 


> 1 


'P 


1 


J 1 
1 

1 


3 


- 



o 
o 



O UJ 
Z Q 

1992 



cr (T >- 

< Q. < 
5 < 2 



1993 



< IXI 



1- 


> o 


?• 


m 


rr 


rr 


>- LU 


V 


ri 


1- 


u 


O LU 


< 


LU 


< 


n 


< z 


—I 


3 


Q. 


o 


2 D 
1992 


-3 


U- 


5 


< 


5 3 

1993^ 




< 


lU 
CO 



Figure 4. 



Comparison of monthly mean dissolved-solids concentrations during water year 1993 with 
long-term dissolved-solids concentrations at two selected stations. 



Sediment 



Suspended-sediment discharge and concentrations were monitored daily at 4 stations and periodically at 
21 stations in the area included in this volume. Monthly and annual bedload discharge were estimated for all daily 
stations. Sediment-monitoring stations are located as far north as Crescent City and as far south as Bryson in San 
Luis Obispo County. Large variations in precipitation and drainage-basin characteristics result in significant 
differences in sediment-discharge rates. 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



Sediment discharges varied widely from long-term averages during the 1993 water year for all the daily sediment 
stations included in this volume. Annual sediment discharge was 128 percent of long-term average (1979-92) for 
Cull Creek above Cull Creek Reservoir, near Castro Valley (station 11180960), and 6 percent of the long-term 
average (1976-92) for Grass Valley Creek at at Fawn Lodge, near Lewiston (station 11525600). 

During the 1993 water year, suspended-sediment discharge for the four daily stations ranged from 1,890 tons per 
year for Grass Valley Creek at Fawn Lodge, near Lewiston (station 11525600) to 53,000 tons per year for San Lorenzo 
Creek at San Lorenzo (station lllBlO'iO). Annual sediment yield ranged from a minimum of 61 tons per scfuare mile 
for Grass Valley Creek at Fawn Lodge, near Lewiston (drainage area, 30.8 square miles) to a maximum of 5,270 tons 
per square mile for Cull Creek above Cull Reservoir, near Castro Valley (drainage area, 5.79 square miles). 

HYDRODYNAMIC DATA FOR SAN FRANCISCO BAY 

The U.S. Geological Survey has collected and continues to collect hydrodynamic data for San Francisco Bay. The 
data include 15-minute interval time-series of salinity, specific conductance, temperature, velocity, «md surface 
water, in addition to time-series of wind velocity, air temperature, and atmospheric pressure. 

The data are stored in a data base that was designed specifically for the storage and retrieval of 
hydrodynamics data for San Francisco Bay. The data base contains time-series data collected by the U.S. Geological 
Survey, as well as those collected by other agencies. Only the data collected by the U.S. Geological Survey will 
be described here. 

The data base resides on a workstation in the U.S. Geological Survey office in Sacramento, California. Data 
requests for U.S. Geological Survey collected data can be obtained by contacting the California District Public 
Information Officer. 



Station No. 



Station name 



Period of record 



Surface-water data 



11181360 
11182130 
11182450 
11185185 
11455470 



San Pablo Strait at Point San Pablo 
Carquinez Strait at Selby 
Carquinez Strait at Martinez 
Suisun Bay at Mallard Island 
Threemile Slough at Sacramento River 



June 1986 to current year 
October 1986 to current year 
June 1986 to September 1988 
September 1986 to September 1987 
March 1979 to May 1985 



11182130 



SUBAYl 
SUBAY2 
SPBAY 



Specific conductance, salinity, temperature 

Carquinez Strait at Selby (two depths) 

Meteorological data 

Suisun Bay at channel marker #13 
Suisun Bay at chemnel marker #27 
San Pablo Bay at channel marker #11 



October 1986 to current year 



August 1988 to April 1990 
July 1992 to current year 
August 1968 to current year 



Velocity data 

The U.S. Geological Survey has collected velocity data at numerous locations throughout the bay using in situ 
current meters and acoustic Doppler current profilers. Most of these data have been published by the U.S. 
Geological Survey using report series other than the annual water resources data report series. 

SPECIAL NETWORKS AND PROGRAMS 

Hvdrologic Benchmark Network is a network of 57 sites in small drainage basins around the country whose purpose 
is to provide consistent data on the hydrology, including water quality, and related factors in representative 
undeveloped drainage basins nationwide. The data provide analyses on a continuing basis to compare and contrast 
conditions observed in basins more obviously affected by the activities of man. 



National Stream Quality Accounting Network (NASQAN) is a nationwide data-collection network designed by the 
U.S. Geological Survey to meet many of the information needs of government agencies and other groups involved in 
natural or regional water-quality planning and management. The 408 sites in NASQAN are located generally at the 
downstream ends of hydrologic accounting units designated by the U.S. Geological Survey Office of Water Data 
Coordination in consultation with the Water Resources Council. The objectives of NASQAN are (1) to obtain 
information on the quality and quantity of water moving within and from the United States through a systematic and 
uniform process of data collection, summarization, analysis and reporting that the data may be used for, (2) to 
describe the areal variability of water quality in the Nation's rivers through analysis of data from this and other 
programs, (3) to detect changes or trends with time in the pattern of occurrence of water-quality characteristics, 
and (4) to provide a nationally consistent data base useful for water-quality assessment and hydrologic research. 



WATER RESOURCES DATA— CALIFORNIA. WATER YEAR 1993 



EXPLANATION OF THE RECORDS 

The surface-Mater records published In this report are for the 1993 water year that began October 1, 1982, and 
ended September 30, 1993. A calendar of the water year is provided on the inside of the front cover. The records 
contain streamflow data, stage and contents data for lakes and reservoirs, and water-cjuality data for surface 
water. The following sections of the introductory text are presented to provide users with a more detailed 
explanation of how the hydrologic data published In this report were collected, analyzed, computed, and arranged 
for presentation. 

Station-Identification Numbers 

Each streamsite data station in this report is assigned a unique identification number. This number is unique 
In that it applies specifically to a given station and to no other. The number usually is assigned when a station 
is first established and is retained for that station indefinitely. The systems used by the U.S. Geological Survey 
to assign identification numbers for surface-water stations and for ground-water well sites differ, but both are 
based on geographic location. The "downstream-order" system is used for regular surface-water stations and the 
"latitude-longitude" system is used for surface-water stations in California where only miscellaneous measurements 
are made. 

Downstream-Order System 

Since October 1, 1950, the order of listing hydrologlc-station records in Survey reports has been in a 
downstream direction along the main stream. All stations on a tributary entering upstream from a main-stream 
station are listed before that station. A station on a tributary that enters between two mainstream stations is 
listed between them. A similar order is followed in listing stations on first rank, second rank, and other ranka 
of tributaries. The rank of any tributary with respect to the stream to which it is imnediately tributary is 
indicated by an indentation in the "List of Stations" in the front of this report. Each indentation represents one 
rank. This downstream order and system of indentation show which stations are on tributaries between any two 
stations and the rank of the tributary on which each station is situated. 

The station-identification number is assigned according to downstream order. In assigning station numbers, no 
distinction is made between partial-record stations and other stations; therefore, the station number for a 
partial-record station indicates downstream-order position in a list made up of both types of stations. Gaps are 
left in the series of numbers to allow for new stations that may be established; hence, the numbers are not 
consecutive. The complete eight-digit number for each station such as ll'iSSSSO, which appears Just to the left of 
the station name, includes the two-digit part number "11" plus the six-digit downstream-order number "46S3S0." The 
part number designates the major river basin; for example, part "11" Is the Pacific Slope Basins in California. 

Latitude-Longitude System 

The identification numbers for miscellaneous surface-water sites are assigned according to the grid system of 
latitude and longitude. The number consists of IS digits. The first six digits denote the degrees, minutes, and 
seconds of latitude, the next seven digits denote degrees, minutes, and seconds of longitude, and the last two 
digits (assigned sequentially) identify the other sites within a 1-second grid (fig. 5). This site-identification 
number, once assigned, is a pure number and has no locational significance. In the rare instance where the initial 
determination of latitude and longitude are found to be in error, the station will retain its initial 
identification number; however, its true latitude and longitude will be listed in the LOCATION paragraph of the 
station description. 



117°38'39' 



117°38'37' 



33°5315 



Coordinates for well D 
(335314117383801) 




33°53'13' 



Coordinates for well C 
(335314117383701) 

Coordinates for wells 
A (335313117383701) and 
6(335313117383702) 



Figure 5. System for numbering miscellaneous sites (latitude and longitude). 



WATER RESOURCES DATA" -CALIFORNIA, WATER YEAR 1993 9 

Records of Stage and Water Discharge 

Records of stage and water discharge may be complete or partial. Complete records of discharge are those 
obtained using a continuous stage-recording device through which either instantaneous or mean daily discharges may 
be computed for any time, or any period of time, during the period of record. Complete records of lake and 
reservoir contents, similarly, are those for which stage or contents may be computed or estimated with reasonable 
accuracy for any time, or period of time. They may be obtained using a continuous stage-recording device, but need 
not be. Because daily mean discharges and end-of-day contents commonly are published for such stations, they are 
referred to as "daily stations." 

By contrast, partial records are obtained through discrete measurements without using a continuous stage- 
recording device and pertain only to a few flow characteristics, or perhaps only one. The nature of the partial 
record is indicated by table titles such as "Crest-stage partial records," or "Low-flow partial records." Records 
of miscellaneous discharge measurements or of measurements from special studies, such as low-flow seepage studies, 
may be considered as partial records, but they are presented separately in this report. Location of all complete- 
record and partial-record stations for which data are given in this report are shown, by county, in figures 6 
through 22. 

Data Collection and Computation 

The data obtained at a complete-record gaging station on a stream or canal consist of a continuous record of 
stage, individual measurements of discharge throughout a range of stages, and notations regarding factors that may 
affect the relationships between stage and discharge. These data, together with supplemental information, such as 
weather records, are used to compute daily discharges. The data obtained at a complete-record gaging station on a 
lake or reservoir consist of a record of stage and of notations regarding factors that may affect the relationship 
between stage and lake contents. These data are used with stage-area and stage-capacity curves or tables to 
compute water-surface areas and lake storage. 

Continuous records of stage are obtained with analog recorders that trace continuous graphs of stage or with 
digital recorders that punch stage values on paper tapes at selected time intervals. Measurements of discharge are 
made with current meters using methods adapted by the U.S. Geological Survey as a result of experience accumulated 
since 1880. These methods are described in standard textbooks, in U,S. Geological Survey Water-Supply Paper 2175, 
and in U.S. Geological Survey Techniques of Water-Resources Investigations (TWRI), Book 3, Chapter A6, 

In computing discharge records, results of individual measurements are plotted against the corresponding 
stages, and stage-discharge relation curves are then constructed. From these curves, rating tables indicating the 
approximate discharge are prepared for any stage within the range of the measurements. If it is necessary to 
define extremes of discharge outside the range of current-meter measurements, the curves are extended using 
(1) logarithmic plotting; (2) velocity-area studies; (3) results of indirect measurements of peak discharge, such 
as slope-area or contracted-opening measurements, and computations of flow-over-dam or weirs; or (4) step-backwater 
technicjues. 

Daily mean discharges are computed by applying the daily mean stages (gage heights) to the stage-discharge 
curves or tables. If the stage-discharge relation is subject to change because of frequent or continual change in 
the physical features that form the control, the daily mean discharge is determined by the shifting-control method, 
in which correction factors based on individual discharge measurements and notes of the personnel making the 
measurements are applied to the gage heights before the discharges are determined from the curves or tables. This 
shifting-control method also is used if the stage-discharge relation is changed temporarily because of aquatic 
growth or debris on the control. For some stations, formation of ice in the winter may so obscure the stage- 
discharge relations that daily mean discharges must be estimated from other information such as temperature and 
precipitation records, notes or observations, and records for other stations in the same or nearby basins for 
comparable periods. 

At some stream-gaging stations, the stage-discharge relation is affected by backwater from reservoirs, 
tributary streams, or other sources. This necessitates the use of the slope method in which the slope or fall in a 
reach of the stream is a factor in computing discharge. The slope or fall is obtained by means of an auxiliary 
gage set at some distance from the base gage. At some stations the stage-discharge relation is affected by 
changing stage; at these stations the rate of change in stage is used as a factor in computing discharge. 

In computing records of lake or reservoir contents, it is necessary to have available surveys, curves, or 
tables defining the relation of stage and contents. The application of stage to the stage-content curves or tables 
gives the contents from which daily, monthly, or yearly changes then are determined. If the stage-content relation 
changes because of deposition of sediment in a lake or reservoir, periodic resurveys may be necessary to redefine 
the relation. When this is done, the contents computed may become increasingly in error as time increases since 
the last survey. Discharges over lake or reservoir spillways are computed from stage-discharge relations in the 
same manner as other stream discharges are computed. 

For some gaging stations, there are periods when no gage-height record is obtained, or the recorded gage height 
Is so faulty that it cannot be used to compute daily discharge or contents. This happens when the recorder stops 
or otherwise fails to operate properly, intakes are plugged, the float is frozen in the well, or for various other 
reasons. For such periods, the daily discharges are estimated from the recorded range in stage, previous or 
following record, discharge measurements, weather records, and comparison with other station records from the same 
or nearby basins. Likewise, daily contents may be estimated from operator's logs, previous or following records, 
inflow-outflow studies, and other information. Information explaining how estimated daily-discharge values are 
identified in station records is included in the next two sections, "Data Presentation" (REMARKS paragraph) and 
"Identifying Estimated Daily Discharge." 



10 WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 



Data Presentation 



Streamflow data in this report are presented in a new format that is considerably different from the format In 
data reports prior to the 1993 water year. The major changes are that statistical characteristics of discharge now 
appear in tabular summaries following the water-year data table and less information is provided in the text or 
station manuscript above the table. These changes represent the results of a pilot program to reformat the annual 
water-data report to meet current user needs and data preferences. 

The records published for each continuous-record surface-water discharge station (gaging station) now consist 
of four parts, the manuscript or station description; the data table of daily mean values of discharge for tha 
current water year with suninary data; a tabular statistical summary of monthly mean flow data for a designated 
period, by water year; and a suimary statistics table that Includes statistical data of annual, dally, and 
instantaneous flows as well as data pertaining to annual runoff. 7-day low-flow minlmums, and flow duration. 

Station manuscript 

The manuscript provides, under various headings, descriptive Information, such as station location; period of 
record; historical extremes outside the period of record; record accuracy; and other remarks pertinent to station 
operation and regulation. The following Information, as appropriate, is provided with each continuous record of 
discharge or lake content. Comments to follow clarify information presented under the various headings of the 
station description. 

LOCATION. — Information on locations is obtained from the most accurate maps available. The location of the 
gaging station is given with respect to the cultural and physical features in the vicinity and with respect to the 
reference place mentioned in the station name. River mileages, given for only a few stations, were determined by 
methods given in "River Mileage Measurement," Bulletin lA , Revision of October 1968, prepared by the Water 
Resources Council or were provided by the U.S. Array Corps of Engineers. 

DRAINAGE AREA. --Drainage areas are measured using the most accurate maps available. Because the type of maps 
available varies from one drainage basin to another, the accuracy of drainage areas likewise varies. Drainage 
areas are updated as better maps become available. 

PERIOD OF RECORD. --This Indicates the period for which there are published records for the station or for an 
equivalent station. An equivalent station is one that was in operation at a time when the present station was not, 
and whose location was such that records from it reasonably can be considered equivalent with records from the 
present station. 

REVISED RECORDS. --Published records, because of new Information, occasionally are Incorrect, and revisions are 
printed in later reports. Listed under this heading are all the reports in which revisions have been published for 
the station and the water years to which the revisions apply. If a revision did not include daily, monthly, or 
annual figures of discharge, that fact is noted after the year dates as follows: "(M)" means that only the 
instantaneous maximum discharge was revised; "(m)" that only the instantaneous minimum was revised; and "(P)" that 
only peak discharges were revised. If the drainage area has been revised, the report is given in which the most 
recently revised figure was published. 

GAGE. --The type of gage in current use, the datum of the current gage referred to sea level (see Definition of 
Terms), and a condensed history of the types, locations, and datums of previous gages are given under this heading. 

REMARKS. --All periods of estimated daily-discharge record will either be identified by date in this paragraph 
of the station description for water-discharge stations or flagged in the daily-discharge table. (See next 
section, "Identifying Estimated Daily Discharge.") If a REMARKS paragraph is used to identify estimated record. 
the paragraph will begin with this information presented as the first entry. The paragraph also is used to present 
information relative to the accuracy of the records, to special methods of computation, to conditions that affect 
natural flow at the station, and possibly to other pertinent items. For reservoir stations, information is given 
on the dam forming the reservoir, the capacity, outlet works and spillway, and purpose and use of the reservoir. 

COOPERATION. --Records provided by a cooperating organization or obtained for the U.S. Geological Survey by a 
cooperating organization are identified. 

EXTREMES FOR PERIOD OF RECORD. --Extremes may include maximum and minimum discharges or content. Unless 
otherwise qualified, the maximum discharge or content is the instantaneous maximum corresponding to the highest 
stage that occurred. The highest stage may have been obtained from a graphic or digital recorder, a crest-stage, 
or by direct observation of a nonrecording gage. If the maximum stage did not occur on the same day as the maximum 
discharge or content. it is given separately. Similarly, the minimum is the instantaneous minimum discharge, 
unless otherwise qualified, and was determined and is reported in the same manner as the maximtim. 

EXTREMES OUTSIDE PERIOD OF RECORD . --Included is information concerning major floods or unusually low flows that 
occurred outside the stated period of record. The information may or may not have been obtained by the U.S. 
Geological Survey. 

EXTREMES FOR CURRENT YEAR. --Extremes given are similar to those for the period of record, except the peak 
discharge listing may include secondary peaks. For stations meeting certain criteria, all peak discharges and 
stages occurring during the water year that are greater than a selected base discharge are presented under this 
heading. The peaks greater than the base discharge, excluding the highest one, are referred to as secondary peaks. 
Peak discharges are not published for canals, ditches, drains, or streams for which the peaks are subject to 
substantial control by man. The time of occurrence for peaks is expressed in 2A-hour local standard time. For 
example, 12:30 a.m. is 0030, and 1:30 p.m. is 1330. The minimum for the current water year appears below the table 
of peak data. 

REVISIONS. --If a critical error is discovered in published records, a revision is included in the first report 
published following discovery of the error. 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAH 1993 



11 



Occasionally the records of a discontinued gaging station may need revision. Because for these stations there 
would be no current or, possible, future station manuscript published to document the revision In a "Revised 
Records" entry, users of data for these stations who obtained the record from previously published data reports may 
wish to contact the District Office to determine if the published records were revised after the station was 
discontinued. If the data were obtained by computer retrieval, the data would bo current and there would be no 
need to check because any published revision of data is always accompanied by revision of the corresponding data in 
computer storage. 

Manuscript information for lake or reservoir stations differs from that for stream stations in the nature of 
the "Remarks" and in the inclusion of a skeleton stage-capacity table when daily contents are given. 

Data table of daily mean values 

The dally table of discharge records for stream-gaging stations gives mean discharge for each day of the water 
year. In the monthly sumnary for the table, the line headed "TOTAL" gives the sum of the dally figures for each 
month; the line headed "MEAN" gives the average flow in cubic feet per second for the month; and the lines headed 
"MAX" and "MIN" give the maximum and minimum daily mean discharges, respectively, for each month. Discharge for 
the month also usually is expressed in cubic feet per second per square mile (line headed "CFSM"); or in Inches 
(line headed "IN."); or in acre-feet (line headed "AC-FT"). Figures for cubic feet per second per square mile and 
runoff in inches or In acre-feet may be omitted if there Is extensive regulation or diversion or if the drainage 
area includes large noncontributing areas. At some stations monthly and (or) yearly observed discharges are 
adjusted for reservoir storage or diversion, or diversion data or reservoir contents are given. These figures are 
identified by a symbol and corresponding footnote. 

Statistics of monthly mean data 

A tabular sumnary of the mean (line headed "MEAN"), maximum (line headed "MAX"), and minimum (line 
headed "MIN") of monthly mean flows for each month for a designated period is provided below the mean values 
table. The water years of the first occurrence of the maximum and minimum monthly flows are provided Immediately 

below those figures. The designated period will be expressed as "FOR WATER YEARS - ,BY WATER YEAR (WY)," 

and will list the first and last water years of the range of years selected from the PERIOD OF RECORD paragraph in 
the station manuscript. It will consist of all of the station record within the specified water years, inclusive, 
including complete months of record for partial water years, if any, and may coincide with the period of record for 
the station. The water years for which the statistics are computed will be consecutive, unless a break in the 
station record is indicated in the manuscript. 

Summary statistics 

A table titled "SUhMARY STATISTICS" follows the statistics of monthly mean data tabulation. This table 
consists of four columns, with the first column containing the line headings of the statistics being reported. The 
table provides a statistical summary of yearly, dally, and Instantaneous flows, not only for the current water year 
but also for the previous calendar year and for a designated period, as appropriate. The designated period 

selected, "WATER YEARS - ," will consist of all of the station record within the specified water years, 

inclusive. Including complete months of record for partial water years, if any, and may coincide with the period of 
record for the station. The water years for which the statistics are computed will be consecutive, unless a break 
in the station record is indicated in the manuscript. All of the calculations for the statistical characteristics 
designated ANNUAL (see line headings below), except for the "ANNUAL 7-DAY MINIMUM" statistic, are calculated for 
the designated period using complete water years. The other statistical characteristics may be calculated using 
partial water years. 

The date or water year, as appropriate, of the first occurrence of each statistic reporting extreme values of 
discharge is provided adjacent to the statistic. Repeated occurrences may be noted in the REMARKS paragraph of the 
manuscript or in footnotes. Because the designated period may not be the same as the station period of record 
published in the manuscript, occasionally the dates of occurrence listed for the daily and Instantaneous extremes 
in the deslgnated-period column may not be within the selected water years listed in the heading. When this 
occurs, it will be noted in the REMARKS paragraph or in footnotes. Selected streamflow duration curve statistics 
and runoff data also are given. Runoff data may be omitted if there is extensive regulation or diversion of flow 
in the drainage basin. 



The following suninary statistics data, as appropriate, are provided with each continuous record of discharge. 
Comnents to follow clarify information presented under the various line headings of the sumnary statistics table. 

ANNUAL TOTAL. — The sum of the dally mean values of discharge for the year. At some stations the annual total 
discharge is adjusted for reservoir storage or diversion. The adjusted figures are identified by a symbol 
and corresponding footnotes . 

ANNUAL MEAN. --The arithmetic mean of the individual dally mean discharges for the year noted or for the 
designated period. At some stations the yearly mean discharge is adjusted for reservoir storage or 
diversion. The adjusted figures are identified by a symbol and corresponding footnotes. At least 
S complete years of record must be available before this statistic is published for the designated period. 

HIGHEST ANNUAL MEAN. — The maximum annual mean discharge occurring for the designated period. 

LOWEST ANNUAL MEAN. --The minimum annual mean discharge occurring for the designated period. 

HIGHEST DAILY MEAN. --The maximum dally mean discharge for the year or for the designated period. 

LOWEST DAILY MEAN. — The minimum daily mean discharge for the year or for the designated period. 



12 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 



INSTANTANEOUS PEAK FLOW. --The maxlmvan Instantaneous discharge occurring for the Hater year or for the 

designated period. Note that secondary Instantaneous peak discharges above a selected base discharge are 

stored in District computer files for stations meeting certain criteria. Those discharge values may be 
obtained by writing to the District Office. (See address on back of title page of this report.) 

INSTANTANEOUS PEAK STAGE. --The maximum instantaneous stage occurring for the water year or for the designated 
period. If the dates of occurrence for the instantaneous peak flow and instantaneous peak stage differ, 
the REMARKS paragraph in the manuscript or a footnote may be used to provide further Information. 

INSTANTANEOUS LOW FLOW. --The mlnlmuo instantaneous discharge occurring for the water year or for the designated 
period. 

ANNUAL RUNOFF. — Indicates the total quantity of water in runoff for a drainage area for the year. Data reports 
may use any of the following units of measurement in presenting annual runoff data: 

Acre-foot (AC-FT) Is the quantity of water required to cover 1 acre to a depth of 1 foot and is equal to A3, 560 
cubic feet or about 326,000 gallons or 1,233 cubic meters. 

Cubic feet per second per square mile (CFSM) is the average number of cubic feet of water flowing per second 
from each square mile of area drained, assuming that the runoff is distributed uniformly in time and area. 

Inches (INCHES) Indicates the depth to which the drainage area would be covered if all the runoff for a given 
period were distributed on it uniformly. 

10 PERCENT EXCEEDS. --The discharge that is exceeded by 10 percent of the flow for the designated period. 

SO PERCENT EXCEEDS. --The discharge that is exceeded by 50 percent of the flow for the designated period. 

90 PERCENT EXCEEDS. --The discharge that is exceeded by 90 percent of the flow for the designated period. 

Data collected at partial-record stations follow the information for continuous-record sites. Data for 
partial-record discharge stations are presented in two tables. The first is a table of annual maximum stage and 
discharge at crest-stage stations, and the second is a table of discharge measurements at low-flow partial-record 
stations. The tables of partial-record stations are followed by a listing of discharge measurements made at sites 
other than continuous-record or partial-record stations. These measurements generally are made in times of drought 
or flood to give better areal coverage to those events. Those measurements and others collected for some special 
reason are called measurements at miscellaneous sites. 

Identifying Estimated Daily Discharge 

Estimated daily-discharge values published in the water-discharge tables of annual State data reports are 
identified either by flagging individual daily values with the letter symbol "e" and printing the table footnote, 
"e Estimated," or by listing the dates of the estimated record in the REMARKS paragraph of the station description. 

Accuracy of the Records 

The accuracy of streamflow records depends primarily on (1) the stability of the stage-discharge relation or, 
if the control is unstable, the frequency of discharge measurements; and (2) the accuracy of measurements of stage 
and discharge, and Interpretation of records. 

The accuracy attributed to the records is Indicated under "REMARKS." "Excellent" means that about 95 percent 
of the daily discharges are within 5 percent of the true; "good," within 10 percent; and "fair," within 15 percent. 
Records that do not meet the criteria mentioned, are rated "poor." Different accuracies may be attributed to 
different parts of a given record. 

3 
Daily mean discharges in this report are given to the nearest hundredth of a cubic foot per second (ft /s) for 
values less than 1 ft /s, to the nearest tenth between 1.0 and 10 ft /s, to whole numbers between 10 and 
1,000 ft Is, and to three significant figures for more than 1,000 ft Is. The number of significant figures used is 
based solely on the magnitude of the discharge value. The same rounding rules apply to discharges listed for 
partial-record stations and miscellaneous sites. 



Discharge at many stations, as indicated by the monthly mean, may not reflect natural runoff due to the effects 
of diversion, consumption, regulation by storage. Increase or decrease in evaporation due to artificial causes, or 
to other factors. For such stations, figures of cubic feet per second per square mile and of runoff, in inches, 
are not published unless satisfactory adjustments can be made for diversions, for changes in contents of 
reservoirs, or for other changes incident to use and control. Evaporation from a reservoir is not included in the 
adjustments for changes in reservoir contents, unless it is so stated. Even at those stations where adjustments 
are made, large errors in computed runoff may occur if adjustments or losses are large in comparison with the 
measured discharge. 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 13 



Other Records Available 



The National Water Data Exchange (NAWDEX), U.S. Geological Survey, Reston, VA 22092, maintains an index of 
sites as well as an index of records of discharge collected by other agencies but not published by the U.S. 
Geological Survey. Information on records at specific sites can be obtained from that office upon request. 

Information used in the preparation of the records in this publication, such as discharge measurement notes, 
gage-height records, temperature measurements, and rating tables are on file in the District Office. Also, most of 
the daily mean discharges are in computer-readable form and have been analyzed statistically. Information on the 
availability of the unpublished information or on the results of statistical analyses of the published records may 
be obtained from the District Office. 

Records of Surface-Water Quality 

Records of surface-water quality ordinarily are obtained at or near stream-gaging stations because 
interpretation of records of surface-water quality nearly always requires corresponding discharge data. Records of 
surface-water quality in this report may involve various types of data and measurement frequencies. 

Classification of Records 

Water-quality data for surface-water sites are grouped into one of three classifications. A continuinn-record 
station is a site where data are collected on a regularly scheduled basis. Frequency may be one or more times 
daily, weekly, monthly, or quarterly. A partial-record station is a site where limited water-quality data are 
collected systematically over a period of years. Frequency of sampling is usually less than quarterly. A 
miscellaneous sampling site is a location other than a continuing or partial-record station, where random samples 
are collected to give better areal coverage to define water-cfuality conditions in the river basin. 

A careful distinction needs to be made between "continuing records" as used in this report and "continuous 
recordings," which refers to a continuous graph or a series of discrete values punched at short intervals on a 
paper tape. Some records of water quality, such as temperature and specific conductance, may be obtained through 
continuous recordings; however, because of costs, roost data are obtained only monthly or less frequently. 
Locations of stations for which records on the quality of surface water appear in this report are shown in figures 
6 through 22. 

Arrangement of Records 

Water-quality records collected at a surface-water daily record station are published immediately following 
that record, regardless of the frequency of sample collection. Station number and name are the same for both 
records. Where a surface-water daily record station is not available or where the water quality differs 
significantly from that at the nearby surface-water station, the continuing water-quality record is published with 
its own station number and name in the regular downstream order sequence. Water-quality data for partial-record 
stations and for miscellaneous sampling sites appear in separate tables following the table of discharge 
measurements at miscellaneous sites. 

Onsite Measurements and Sample Collection 

In obtaining water-quality data, a major concern is the assurance that the data obtained represent the in-situ 
quality of the water. To assure this, certain measurements, such as water temperature, pH, and dissolved oxygen, 
are made onsite when samples are taken. To assure that measurements made in the laboratory also represent the in - 
situ water, carefully prescribed procedures are followed in collecting the samples, in treating the sauples to 
prevent changes in quality pending analysis, and in shipping the samples to the laboratory. Procedures for onsite 
measurements and for collecting, treating, and shipping samples are given in "Techniques of Water-Resources 
Investigations," Book 1, Chapter D2; Book 3, Chapter C2; and Book 5, Chapters Al, A3, and AA . All these references 
are listed in the section "Publications on Techniques of Water-Resources Investigations". Also, detailed 
information on collecting, treating, and shipping samples may be obtained from the District Office. 

One sample can adequately define the water quality at a given time if the mixture of solutes throughout the 
stream cross section is homogeneous. However, the concentration of solutes at different locations in the cross 
section may vary widely with different rates of water discharge, depending on the source of material and the 
turbulence and mixing of the stream. Some streams must be sampled through several vertical sections to obtain a 
representative sample needed for an accurate mean concentration and for use in calculating load. All samples 
obtained for the National Stream Quality Accounting Network (see definitions) are obtained from at least several 
verticals. Whether samples are obtained from the centroid of flow or from several verticals depends on flow 
conditions and other factors which must be evaluated by the collector. 

Chemical-quality data published in this report are considered to be the most representative value available for 
the stations listed. The values reported represent water-quality conditions at the time of sampling as much as 
possible, consistent with available sampling techniques and methods of analysis. In the rare case where an 
apparent inconsistency exists between a reported pH value and the relative abundance of carbon dioxide species 
(carbonate and bicarbonate), the inconsistency is the result of a slight upteike of carbon dioxide from the air by 
the sample between measurement of pH in the field and determination of carbonate and bicarbonate in the laboratory. 



U WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 

For chemical-quality stations equipped with digital monitors, the records consist of daily maximum and minimum 
values for each constituent measured and are based on hourly punches beginning at 0100 hours and ending at 2A00 
hours for the day of record. More detailed records (hourly values) may be obtained from the District Office. 

Historical and current (1992) dissolved trace-element concentrations are reported herein for water that was 
collected, processed, and analyzed by using either ultraclean or other than ultraclean techniques. If ultraclean 
techniques were used, then those concentrations are reported in nanograms per liter (ng/L) . If other than 
ultraclean techniques were used, then those concentrations are reported in micrograms per liter (/ig/L) and could 
reflect contamination introduced during some phase of the procedure. 

Water Temperature 

Water temperatures are measured at the water-quality stations. In addition, water temperatures are taken at 
time of discharge measurements for water-discharge stations. For stations where water temperatures are taken 
manually once or twice daily, the water temperatures are taken at about the same time each day. Large streams have 
a small diurnal temperature change; shallow streams may have a daily range of several degrees and may follow 
closely the changes in air temperature. Some streams may be affected by waste-heat discharges. 

At stations where recording instruments are used, either mean temperatures or majcimum and minimum temperatures 
for each day are published. Water temperatures measured at the time of water-discharge measurements are on file in 
the District Office. 

Sediment 

Suspended-sediment concentrations are determined from samples collected by using depth-integrating samplers. 
Samples usually are obtained at several verticals in the cross section, or a single sample may be obtained at a 
fixed point and a coefficient applied to determine the mean concentration in the cross section. 

During periods of rapidly changing flow or rapidly changing concentration, samples may have been collected more 
frequently (twice daily or, in some instances, hourly). The published sediment discharges for days of rapidly 
changing flow or concentration were computed by the subdivided-day method (time-discharge weighted average). 
Therefore, for those days when the published sediment discharge value differs from the value computed as the 
product of discharge times mean concentration times 0.0027, the reader can assume that the sediment discharge for 
that day was computed by the subdlvided-day method. For periods when no samples were collected, daily discharges 
of suspended sediment were estimated on the basis of water discharge, sediment concentrations measured inmediately 
before and after the periods, and suspended-sediment loads for other periods of similar discharge. 

At other stations, suspended-sediment samples were collected periodically at many verticals in the stream cross 
section. Although data collected periodically may represent conditions only at the time of observation, such data 
are useful in estetblishing seasonal relations between quality and streamflow and in predicting long-term sediment- 
discharge characteristics of the stream. 

In addition to the records of suspended-sediment discharge, records of the periodic measurements of the 
particle-size distribution of the suspended sediment and bed material are included for some stations. 

Estimates of bedload and total-sediment discharge are included for some stations. Computations of monthly 
bedload discharges are based on the relation between instantaneous water discharge and corresponding bedload 
discharge for the station. Values of bedload discharge used in defining this relation are based on samples 
obtained by use of the Helley-Smlth bedload sampler or by modif led-Einstein or Meyer-Peter Muller computation 
procedures. Application of the bedload-transport relation at a station was made on a daily basis or subdivided-day 
basis. The Helley-Smlth sampler is designed to collect a time-weighted sample for the sediment moving within 
0.25 ft of the streambed. Sediment moving in this portion of the flow cannot be sampled with standard suspended- 
sediment samplers. Calibration of the Belley-Smith sampler has not been completed, and a trap efficiency of 
1.0 has been assumed applicable to this device. Error sources in the theoretical methods, based on analysis of 
bed-material characteristics, channel geometry, and associated hydraulic factors, are also undefined. In 
consequence, figures of bedload discharge must be used with caution. They are estimates, at best, and are subject 
to revision. 

Cross-Sectional Data 

Cross-sectional surveys of water temperature, pR, specific conductance, dissolved oxygen, and suspended 
sediment are done at all NASQAN and Hydrologic Benchmark stations during various seasons and surface-water 
discharges. Documentation of cross-section variation of water quality is essential in order to determine how many 
samples in a cross section are necessary to ensure a representative composite sample. 

Laboratory Measurements 

Sediment samples, samples for biochemical-oxygen demand (BOD), samples for Indicator bacteria, and daily 
samples for specific conductance are analyzed locally. All other samples are analyzed in the U.S Geological 
Survey's National Water-Quality Laboratory in Arvada, Colorado. Methods used in analyzing sediment samples and 
computing sediment records are given in Techniques of Water-Resources Investigations, Book 5, (Chapter CI; methods 
used by the laboratories are given in Book 1, Chapter D2; Book 3, Cliapter C2; and Book 5, CJhapters Al, A3, and A4. 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 15 



Data Presentation 



For continuing-record stations, information pertinent to the history of station operation is provided in 
descriptive headings preceding the tabular data. These descriptive headings give details regarding location, 
drainage area, period of record, type of data available, instrumentation, general remarks, cooperation, and 
extremes for parameters currently measured daily. Tables of chemical, physical, biological, radiochemical data, 
and other data obtained at a frequency less than daily are presented first. Tables of "dally values" of specific 
conductance, pH, water temperature, dissolved oxygen, and suspended sediment follow in sequence. 

In the descriptive headings, if the location is identical to that of the discharge gaging station, neither the 
LOCATION nor the DRAINAGE AREA statements are repeated. The following information, as appropriate, is provided 
with each continuous-record station. Comments that follow clarify information presented under the various headings 
of the station description. 

LOCATION. — See Data Presentation under "Records of Stage and Water Discharge;" same cotiments apply. 

DRAINAGE AREA. — See Data Presentation under "Records of Stage and Water Discharge;" same comments apply. 

PERIOD OF RECORD. --This indicates the periods for which there are published water-quality records for the 
station. The periods are shown separately for records of parameters measured daily or continuously ernd those 
measured less than daily. For those measured daily or continuously, periods of record are given for the individual 
parameters . 

INSTRUMENTATION. --Information on instrumentation is given only if a water-quality monitor, temperature 
recorder, sediment pumping sampler, or other sampling device is in operation at a station. 

REMARKS. --Remarks provide added information pertinent to the collection, analysis, or computation of the 
records. 

COOPERATION. --Records provided by a cooperating organization or obtained for the U.S. Geological Survey by a 
cooperating organization are idefftifled here. 

EXTREMES. --Maximums and minimums are given only for parameters measured daily or more frequently. None are 
given for parameters measured weekly or less frequently because the true maximums or minimums may not have been 
sampled. Extremes, when given, are provided for both the period of record and for the current water year. 

REVISIONS. --If errors in water-quality records are discovered after publication, appropriate updates are made 
to the Water-Quality File in the U.S. Geological Survey's computerized data system, WATSTORE, and subsequently by 
monthly transfer of update transactions to the U.S. Environmental Protection Agency's STORET system. Because the 
usual volume of updates makes it impractical to document individual changes in the State data-report series or 
elsewhere, potential users of U.S. Geological Survey water-quality data are encouraged to obtain all required data 
from the appropriate computer file to ensure the most recent updates. 

The surface-water-quality records for partial-record stations and miscellaneous sampling sites are published in 
separate tables following the table of discharge measurements at miscellaneous sites. No descriptive statements 
are given for these records. Each station is published with its own station number and name in the regular 
downstream-order sequence. 

ACCESS TO WATSTORE DATA 

The U.S. Geological Survey is the principal Federal water-data agency and, as such, collects and disseminates 
about 70 percent of the water data currently being used by numerous State, local, private, and other Federal 
agencies to develop tind manage our water resources. As part of the Geological Survey's program of releasing water 
data to the public, a large-scale computerized system has been developed for the storage and retrieval of water 
data collected through its activities. The National Water Data Storage and Retrieval System (WATSTORE) was 
established in 1972 to provide an effective and efficient means for the processing and maintenance of water data 
collected through the activities of the U.S. Geological Survey and to facilitate release of the data to the public. 
A variety of useful products ranging from data tables to complex statistical analyses, such as Log Pearson Type 
III, can be produced using WATSTORE. The system resides on the central computer facilities of the U.S. Geological 
Survey at its National Center in Reston, Virginia, and consists of related files and data bases. 

* Station Header File - Contains descriptive information on more than 440,000 sites throughout the United 
States and its territories where the U.S. Geological Survey collects or has collected data. 

* Daily Values File - Contains more than 220 million daily values of streamflows, stages, reservoir contents, 
water temperatures, specific conductances, sediment concentrations, sediment discharges, and ground-water 
levels . 

* Peeik Flow File - Contains approximately 500,000 maximum (peak) streamflow and gage-height values at surface- 
water sites. 

* Water Quality File - Contains approximately 2 million analyses of water samples that describe the chemical, 
physical, biological, and radio-chemical characteristics of both surface and ground water. 

* Ground-Water Site Inventory Data Base - Contains inventory data for more than 900,000 wells, springs, and 
other sources of ground water. The data includes site location, geohydrologic characteristics, well- 
construction history, and one-time field measurements such as water temperature. 



16 WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 

In 1976, the U.S. Geological Survey opened WATSTORE to the public for direct access. The signing of a 
Memoranduro of Agreement with the Survey is required to obtain direct access to WATSTORE. The system can be 
accessed either synchronously or asynchronously. The requestor will be expected to pay all computer costs he/she 
incurs. Direct access may be obtained by contacting: 

U.S. Geological Survey 
National Water Data Exchange 
421 USGS National Center 
Reston, VA 22092 

In addition to providing direct access to WATSTORE, data can be provided in various machine-readable formats on 
magnetic tape or 5 l/'i-lnch floppy disk and, as noted in the introduction, on CD-ROM discs. Beginning with the 
1990 water year, all water-data reports also will be available on Compact Disc--Read Only Memory (CD-ROM). All 
data reports published for the current water year for the entire Nation, including Puerto Rico and the Trust 
Territories, will be reproduced on a single CD-ROM disc. Information about the availability of specific types of 
data or products, and user charges, can be obtained locally from each of the Water Resources Division's District 
offices. (See address on the back of the title page.) A limited number of CD-ROM discs will be available for 
purchase from U.S. Geological Survey, Earth Science Information Center, Open-File Reports Section, Box 2S2B6 , MS 
517, Denver Federal Center, Denver, CO 80225. 

DEFINITION OF TERMS 

Terms related to streamflow, wator-(juality , and other hydrologic data, as used in this report are defined 
below. See the table for converting inch-pound units to International System (SI) Units on the inside of the back 
cover . 

Acre-foot (AC-FT, acre-ft) is the quantity of water required to cover 1 acre to a depth of 1 foot and is 
equivalent to 43,560 cubic feet or about 326,000 gallons or 1,233 cubic meters. 

Adenosine triphosphate (ATP) is an organic, phosphate-rich, compound Important in the transfer of energy in 

organisms. Its central role in living cells makes it an excellent indicator of the presence of living material in 

water. A measure of ATP therefore provides a sensitive and rapid estimate of biomass . ATP is reported in 
micrograms per liter of the original water sample. 

Algae are mostly aquatic single-celled, colonial, or multicelled plants, containing chlorophyll and lacking 
roots, stems, and leaves. 

Algal growth potential (AGP) is the maximum algal dry weight biomass that can be produced in a natural water 
sample under standardized laboratory conditions. The growth potential is the algal biomass present at stationary 
phase and Is expressed as milligrams dry weight of algae produced per liter of sample. 

Aquifer is a geologic formation, group of formations, or part of a formation that contains sufficient saturated 
permeable material to yield significant quantities of water to wells and springs. 

Artesian means confined and is used to describe a well in which the water level stands above the top of the 
aquifer tapped by a well. A flowing artesian well is one in which the water level is above the land surface. 

Bacteria are microscopic unicellular organisms, typically spherical, rodlike, or spiral and threadlike in 
shape, often clumped into colonies. Some bacteria cause disease; others perform an essential role in nature in the 
recycling of materials, for example, decomposing organic matter into a form available for reuse by plants. 

Total coliform bacteria are a particular group of bacteria that are used as indicators of possible sewage 
pollution. They are characterized as aerobic or facultative anaerobic, gram-negative, nonspore- forming, rod- 
shaped bacteria which ferment lactose with gas formation within 48 hours at 35*C. For the membrane filter 
method, these bacteria are defined as the organisms which produce colonies with a golden-green metallic sheen 
within 24 hours when incubated at 35'C + 0.5°C on M-Endo medium (nutrient medium for bacterial growth). Their 
concentrations are expressed as number of colonies per 100 milligrams per liter of sample. 

Fecal-coliform bacteria are bacteria that are present in the Intestines or feces of warm-blooded animals. 
They are often used as indicators of the sanitary quality of the water. For the membrane filter method, they 
are defined as all organisms which produce blue colonies within 24 hours when incubated at 44.5'C + 0.2*C on M- 
FC medium (nutrient medium for bacterial growth). Their concentrations are expressed as number of colonies per 
100 milligrams per liter of sample. 

Fecal-streptococcal bacteria are bacteria found in Intestines of warm-blooded animals. Their presence in 
water is considered to verify fecal pollution. They are characterized as gram-positive, cocci bacteria which 
are capable of growth in brain-heart infusion broth. For the membrane filter method they are defined as all 
the organisms which produce red or pink colonies within 48 hours at 35°C + 0.5'C on KF streptococcus medium 
(nutrient medium for bacterial growth). Their concentrations are expressed as number of colonies per 100 
milligrams per liter of sample. 

Bed material is the unconsolidated material of which a streambed, lake, pond, reservoir, or estuary bottom is 
composed. 

Benthic organisms (invertebrates) are the group of animals living in or on the bottom of an aquatic 
environment. They include a number of types of organisms, such as bacteria, fungi, insect larvae and nymphs, 
snails, clams, and crayfish. 

Biochemical oxygen demand (BOD) is a measure of the quantity of dissolved oxygen, in milligrams per liter, 
necessary for the decomposition of organic matter by micro-organisms, such as bacteria. 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 17 

Blomass is the amount of living matter present at any given time, expressed as the mass per unit area or volume 
of habitat. 

Ash mass is the mass or amount of residue present after the residue from the dry mass determination has been 

ashed in a muffle furnace at a temperature of 500*C for 1 hour. The ash mass values of zooplankton «uid 

phytoplankton are expressed in grams per cubic meter (g/m ) and periphyton and benthic organisms in grams per 
square meter (g/m ). 

Dry mass refers to the mass of residue present after drying in an oven at 105"C for zooplankton and 
periphyton, until the mass remains unchanged. This mass represents the total organic matter, ash and sediment, 
in the sample. Dry mass values are expressed in the same units as ash mass. 

Organic mass or volatile mass of the living substance is the difference between the dry mass and ash mass, 
and represents the actual mass of the living matter. The organic mass is expressed in the same units as for 
ash mass emd dry mass. 

Wet mass is the mass of living matter plus contained water. 

Bottom material : See Bed material. 

Cell volume determination is one of several common methods used to estimate biomass of algae in aquatic 
systems. Cell numbers of algae are frequently used in aquatic surveys as an indicator of algal production. 
However, cell numbers alone cannot represent true biomass because of considerable cell-size variation among the 
algal species. Cell volume (/im ) is determined by obtaining critical cell measurements on cell dimensions (that 
is, length, width, height, or radius) for 20 to 50 cells of each important species to obtain an average biovolume 
per cell. Cells are categorized according to the correspondence of their cellular shape to the nearest geometric 
solid or combinations of simple solids (that is, spheres, cones, or cylinders). Representative formulae used to 
compute biovolume are as follows : 

sphere */3 «r cone 1/3 wrTi cylinder ftrTi. 

From cell volume, total algal biomass expressed as biovolume (ftm /mL) is thus determined by multiplying the number 
of cells of a given species by its average cell volume and then summing these volumes over all species. 

Cells per volume (cells/volume) refers to the number of cells of any organism that are counted by using a 
microscope and grid or counting cell. Many planktonic organisms are multicelled and are counted according to the 
number of contained cells per sample, usually in milliliters (mL) or liters (L). 

Cliemical oxygen demand (COD) is a measure of the chemically oxidizable material in the water and furnishes an 
approximation of the amount of organic and reducing material present. The determined value may correlate with 
natural water color or with carbonaceous organic pollution from sewage or industrial wastes. 

Chlorophyll refers to the green pigments of plants. Clihlorophyll a and b are the two most common pigments in 
plants. 

Color unit is produced by 1 milligram per liter of platinum in the form of the chloroplatinate ion. Color is 
expressed in units of the platinum-cobalt scale. 

Contents is the volume of water in a reservoir or lake. Unless otherwise indicated, volume is computed on the 
basis of a level pool and does not include bank storage. 

Control designates a feature downstream from the gage that determines the stage-discharge relation at the gage. 
This feature may be a natural constriction of the channel, an artificial structure, or a uniform cross section over 
a long reach of the channel. 

Control structure as used in this report is a structure on a stream or canal that is used to regulate the flow 
or stage of the stream or to prevent the intrusion of saltwater. 

Cubic foot per second (ft /s) is the rate of discharge representing a volume of 1 cubic foot passing a given 
point during 1 second and is equivalent to approximately 7.A8 gallons per second or '1A8.8 gallons per minute or 
0.02832 cubic meters per second. 

Cubic foot per second-day (cfs.d) is the volume of water represented by a flow of 1 cubic foot per second for 
2* hours. It is eqtuivalent to 86,'i00 cubic feet, approximately 1.9835 acre-feet, or about 646,000 gallons or 2,445 
cubic meters. 

Discharge is the volume of water (or more broadly, total fluid plus suspended sediment), that passes a given 
point within a given period of time. 

Mean discharge (MEAN) is the arithmetic mean of individual daily mean discharges during a specific period. 

Instantaneous discharge is the discharge at a particular instant of time. 

Annual 7-daY minumum is the lowest mean discharge for 7 consecutive days for a calendar year or a water 
year. Note that most low-flow frequency analyses of annual 7-day minimum flows use a climatic year (April 1- 
March 31). The date shown in the summary statistics table is the initial date of the 7-day period. (This 
value should not be confused with the 7-day 10-year low-flow statistic.) 

Dissolved refers to that material in a representative water sample which passes through a 0.4 5-micrometer 
membrane filter. This is a convenient operational definition used by Federal agencies that collect water data. 
Determinations of "dissolved" constituents are made on subsamples of the filtrate. It is recognized that certain 
kinds of samples cannot be filtered; to provide for this, procedures that are considered equivalent to filtering 
through a 0.45-micrometer membrane filter will be identified and announced at a later date. 



18 WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 

Diasolved-sollds concentration of water Is determined either analytically or by the "resldue-on-evaporatlon" 
method, or mathematically by totaling the concentrations of Individual constituents reported In a comprehensive 
chemical analysis. During the analytical determination of dissolved solids, the bicarbonate (generally a major 
dissolved component of water) Is converted to carbonate. Therefore, in the mathematical calculation of dlssolved- 
sollds concentration, the bicarbonate value. In milligrams per liter, is multiplied by O.AQZ to reflect the change. 

Diversity index is a numerical expression of evenness of distribution of acjuatic organisms. The formula £or 
diversity index is: 

- ' "i 2 "i 
d - Z — log2 -i, 

1-1 " 

where iij is the number of individuals per taxon, n is the total number of individuals, and s is the total number of 
taxa In the sample of the conmunity. Diversity index values range from zero, when all the organisms in the samples 
are the same; to some positive number, when some or all the organisms in the sample are different. 

DrainaRe area of a stream at a specified location is that area, measured in a horizontal plane, enclosed by a 
topographic divide from which direct surface runoff from precipitation normally drains by gravity into the stream 
above the specified point. Figures of drainage area given include all closed basins, or noncontrlbuting areas, 
within the area unless otherwise noted. 

Drainane basin is a part of the surface of the Earth that is occupied by a drainage system, which consists of a 
surface stream or body of impounded surface water, together with all tributary surface streams and bodies of 
Impounded surface water. 

GaRe datum is the elevation of the zero point of the reference gage from which gage height is determined as 
compared to sea level. This elevation is established by a system of levels from known bench marks or by 
approximation from topographic maps . 

GaRe heiRht (G.H.) is the water-surface elevation referred to some arbitrary gage datum. Gage height is often 
used interchangeably with the more general term "stage," although gage height is more appropriate when used with a 
reading on a gage. 

GaRlng station is a particular site on a stream, canal, lake, or reservoir where systematic observations of 
hydrologic data are obtained. 

Hardness of water is a physical-chemical characteristic that is commonly recognized by the increased quantity 
of soap that is required to produce lather. It is attributable to the presence of alialine earths (principally 
calcium and magnesium) and is expressed as equivalent calcium carbonate (CaCO,). 

HvdroloRic Benchmark Network is a network of 57 sites in small drainage basins around the country whose purpose 
is to provide consistent data on the hydrology, including water quality, and related factors in representative 
undeveloped watersheds nationwide, and to provide analyses on a continuing basis to compare and contrast conditions 
observed in basins more obviously affected by the activities of man. 

HvdroloRlc unit is a geographic area representing part or all of a surface drainage basin or distinct 
hydrologic feature as delineated by the Office of Water Data Coordination on the State Hydrologic Unit Maps; each 
hydrologic unit is identified by an eight-digit number. 

LiRht-attenuation coefficient , also known as the extinction coefficient, is a measure of water clarity. Light 
is attenuated according to the Lambert-Beer equation 

I - I e-^K 
o 

where I is the source light Intensity, I is the light intensity at length L (in meters) from the source, X. is the 
light-attenuation coefficient, and e is the base of the natural logarithm. The light-attenuation coefficient is 
defined as 

^ - - L ^°8e I • 
o 

Macrophvtes are the macroscopic plants in the aquatic environment. The most common macrophytes are the rooted 
vascular plants that are usually arranged in zones in aquatic ecosystems and restricted in the area by the extent 
of illumination through the water and sediment deposition along the shoreline. 

Metamorphlc staRe refers to the stage of development that an organism exhibits during its transformation from 
an immature form to an adult form. This development process exists for most Insects, and the degree of difference 
from the immature stage to the adult form varies from relatively slight to pronounced, with many intermediates. 
Examples of metamorphlc stages of insects are egg-larva-pupa-adult or egg-nymph- adult . 

Methylene blue active substance (MBAS) is a measure of apparent detergents. This determination depends on the 
formation of a blue color when methylene blue dye reacts with synthetic detergent compounds. 

MicroRrams per Rram (UG/G, »jg/g) is a unit expressing the concentration of a chemical constituent as the mass 
(micrograms) of the element per unit mass (gram) of material analyzed. 

MicroRrams per liter (UG/L, /ig/L) is a unit expressing the concentration of chemical constituents in solution 
as mass (micrograms) of solute per unit volume (liter) of water. One thousand micrograms per liter is equivalent 
to 1 milligram per liter. 

MilliRrams per liter (MG/L, mg/L) is a unit for expressing the concentration of chemical constituents in 
solution. Milligrams per liter represent the mass of solute per unit volume (liter) of water. Concentration of 
suspended sediment also is expressed in milligrams per liter and is based on the mass of sediment per liter of 
water-sediment mixture. 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 19 

Nanograms per liter (NG/L, ng/L) is a unit expressing the concentration of chemical constituents in solution as 
mass (nanograms) of solute per unit volume (liter) of water. (3ne million nanograms per liter is equivalent to 
1 milligram per liter. 

National Geodetic Vertical Datum of 1929 (NGVD) is a geodetic datum derived from a general adjustment of the 
first order level nets of both the United States and Canada. It was formerly called Sea Level Datum of 1929 or 
mean sea level in this series of reports. Although the datum was derived from the average sea level over a period 
of many years at 26 tide stations along the Atlantic, Gulf of Mexico, and Pacific Coasts, it does not necessarily 
represent local mean sea level at any particular place. 

National Stream Quality Accounting Network (NASQAN) is a nationwide data-collection network designed by the 
U.S. Geological Survey to meet many of the information needs of government agencies and other groups involved in 
natural or regional water-quality planning and management. The 408 sites in NASQAN are generally located at the 
downstream ends of hydrologic accounting units designated by the U.S. Geological Survey Office of Water Data 
Coordination in consultation with the Water Resources Council. The objectives of NASQAN are (1) to obtain 
information on the quality and quantity of water moving within and from the United States through a systematic and 
uniform process of data collection, summarization, analysis, and reporting that the data may be used for, (2) to 
describe the areal variability of water quality in the Nation's rivers through analysis of data from this and other 
programs, (3) to detect changes in trends with time in the pattern occurrence of water-quality characteristics, and 
(A) to provide a nationally consistent data base useful for water-quality assessment and hydrologic research. 

Nekton are the consumers in the ac[uatic environment and consist of large free-swimning organisms that are 
capable of sustained, directed mobility. 

Organism is any living entity, such as an insect, phytoplankter, or zooplankter. 

Organism count/area refers to the number of organisms collected and enumerated in a sample and adjusted to 
the number per unit area of the habitat, usually scjuare meter (m ), acre, or hectare. Periphyton, benthic 
organisms, and macrophytes are expressed in these terms. 

Organism count/volume refers to the number of organisms collected and enumerated in a sample and adjusted 
to the number per sample volume, usually milliliter (mL) or liter (L). Numbers of planktonic organisms can be 
expressed in these terms. 

Total organism count is the total number of organisms collected and enumerated in any particular sample. 

Parameter code is a five-digit number used in the U.S. Geological Survey computerized data system, WATSTORE, to 
uniquely identify a specific constituent. The codes used in WATSTORE are the same as those used in the U.S. 
Environmental Protection Agency data system, STORE! . The Environmental Protection Agency assigns and approves all 
requests for new codes. 

Partial-record station is a site where limited streamflow and/or water-quality data are collected 
systematically over a period of years for use In hydrologic analyses. 

Particle size is the diameter, in millimeters (mm), of a particle determined by either sieve or sedimentation 
methods. Sedimentation methods (pipet, bottom-withdrawal tube, visual-accumulation tube) determine fall diameter 
of particles in distilled water (chemically dispersed) or in native water (the river water at the time and point of 
sampling) . 

Particle-size classification used in this report agrees with recommendations made by the American Geophysical 
Union Subcommittee on Sediment Terminology. The classification is as follows: 

Classification Size (irm) Method of analysis 

Clay 0.00024-0.004 Sedimentation 

Silt 0.004-0.062 Sedimentation 

Sand 0.062-2.0 Sedimentation or sieve 

Gravel 2.0-64.0 Sieve 

The particle-size distributions given in this report are not necessarily representative of all particles in 
transport in the stream. Most of the organic material is removed, and the sample is subjected to mechanical and 
chemical dispersion before analysis in distilled water. Chemical dispersion is not used for native water analysis. 

Percent composition or percent of total is a unit for expressing the ratio of a particular part of a sample or 
population to the total sample or population, in terms of types, numbers, weight, or volume. 

Periphyton is the assemblage of micro-organisms attached to and living upon submerged solid surfaces. While 
primarily consisting of algae, the periphyton also include bacteria, fungi, protozoa, rotifers, and other small 
organisms. Periphyton are useful indicators of water quality. 

Pesticides are chemical compounds used to control undesirable organisms. Major categories of pesticides 
include insecticides, miticides, fungicides, herbicides, and rodenticides. Insecticides and herbicides, which 
control insects and plants, respectively, are the two categories reported. 

pH of water is the negative logarithm of the hydrogen-ion activity. Solutions with pH less than 7 are termed 
"acidic," and solutions with a pH greater than 7 are termed "basic." Solutions with a pH of 7 are neutral. The 
presence and concentration of many dissolved chemical constituents found in water are, in part, influenced by the 
hydrogen-ion activity of water. Biological processes including growth, distribution of organisms, and toxicity of 
the water to organisms are also influenced, in part, by the hydrogen-ion activity of water. 

-12 
Picocurie (PC, pCi) is one trillionth (1 x 10 ) of the amount of radioactivity represented by a curie (CD. 

A curie is the amount of radioactivity that yields 3.7 x 10^^ radioactive disintegrations per second. A plcocurla 

yields 2.22 dpoi (disintegrations per minute). 



20 WATEK RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 

Plankton are suspended, floating, or weakly swinining organisms that live In the open water of lakes and rivers. 

Phytoplankton compose the plant part of the plankton. They are usually microscopic, and their movement is 
subject to water currents. Phytoplankton growth Is dependent upon solar radiation and nutrient substances. 
Because they are able to incorporate as well as release materials into the surrounding water, the 
phytoplankton have a profound effect on the quality of the water. They are the primary food producers in the 
aquatic environment and are comnonly known as algae. 

Blue-Rreen alRae are phytoplankton organisms having a blue pigment in addition to the green pigment 
called chlorophyll. Blue-green algae often cause nuisance conditions in water. 

Diatoms are the unicellular or colonial algae having a siliceous shell. Their concentrations are 
expressed as number of cells per milliliter (cells/mL) of sample. 

Green aluae have chlorophyll pigments similar in color to those of higher green plants. Some forms 
produce algal mats or floating "moss" in lakes. Their concentrations are expressed as number of cells per 
milliliter (cells/mL) of sample. 

Zooplankton is the animal part of the plankton. Zooplankton are capable of extensive movements within the 
water column and are often large enough to be seen with the unaided eye. Zooplankton are secondary consumers 
feeding upon bacteria, phytoplankton, and detritus. Because they are the grazers in the aquatic environment, 
the zooplankton are a vital part of the aquatic food web. The zooplankton conmunity is dominated by small 
crustaceans and rotifers. 

Polychlorlnated biphenvls (PCBs) are industrial chemicals that are mixtures of chlorinated biphenyl compounds 
having various percentages of chlorine. They are similar in structure to organochlorine insecticides. 

Primary productivity is a measure of the rate at which new organic matter is formed and accumulated through 
photosynthetic and chemosynthetic activity of producer organisms, chiefly green plants. The rate of primary 
production is estimated by measuring the amount of carbon assimilated by plants (carbon method) or the amount of 
oxygen released (oxygen method). 

Milligrams of carbon per area or volume per unit time [mK C/(m /time) for periphyton and macrophytes and mg 
C/(m /time) for phytoplankton] are the units for expressing primary productivity. They define the amount of 
carbon dioxide consumed as measured by radioactive carbon (carbon-lA) . The carbon-1* method is of greater 
sensitivity that the oxygen light- and dark-bottle method, and is preferred for use in unenriched waters. Unit 
time may be either the hour or day, depending on the incubation period. 

Milligrams of oxvuen per area or volume per unit time [mg 0_/(m /time) for periphyton and macrophytes and 
mg 0,/(m /time) for phytoplankton] are the units for expressing primary productivity. They define production 
and respiration rates as estimated from changes in the measured dissolved-oxygen concentration. The oxygen 
light- and dark-bottle method is preferred if the rate of primary production is sufficient for accurate 
measurements to be made within 2A hours. Unit time may be either the hour or day, depending on the incubation 
period. 

Radiochemical Program is a network of regularly sampled water-quality stations where samples are collected to 
be emalyzed for radioisotopes. The streams that are sampled represent major drainage basins in the conterminous 
United States. 

Recoverable from bottom material is the amount of a given constituent that is in solution after a 
representative sample of bottom material has been digested by a method (usually using an acid or mixture of acids) 
that results in dissolution of readily soluble substances. Complete dissolution of all bottom material is not 
achieved by the digestion treatment; thus, the determination represents less than the total amount (that is, less 
than 95 percent) of the constituent in the sample. To achieve comparability of analytical data, equivalent 
digestion procedures would be required of all laboratories performing such analyses because different digestion 
procedures are likely to produce different analytical results. 

Sea level refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929) — a geodetic datum derived froo 
a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level 
Datum of 1929. 

Sediment is solid material that originates mostly from disintegrated rocks and is transported by, suspended in, 
or deposited from water; it includes chemical and biochemical precipitates and decomposed organic material such as 
humus. The quantity, characteristics, and cause of occurrence of sediment in streams are influenced by 
environmental factors. Some major factors are degree of slope, length of slope, soil characteristics, land usage, 
and quantity and intensity of precipitation. 

Bedload is the sediment that is transported in a stream by rolling, sliding, or skipping along the bed and 
very close to it. In this report, bedload is considered to consist of particles in transit within 0.25 ft of 
the streambed. 

Bedload discharge (tons per day) is the quantity of sediment, as measured by dry weight, that moves past ■ 
section as bedload in a given time. 

Suspended sediment is the sediment that at «my given time is maintained in suspension by the upward 
com[>onents of turbulent currents or that exists in suspension as a colloid. 

Suspended-sediment concentration is the velocity-weighted concentration of suspended sediment in the 
sampled zone (from the water surface to a point approximately 0.3 ft above the bed) expressed as milligrams of 
dry sediment per liter of water-sediment mixture (mg/L). 

Mean concentration is the time-weighted concentration of suspended sediment passing a stream section 
during a 2A-hour period. 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 21 

Suspended-sediment discharge (tons per day) Is the rate at which dry weight of sediment passes a section of 
a stream or is the cjuantity of sediment, as measured by dry mass or volume, that passes a section in a given 
time. It is calculated in units of tons per day by multiplying discharge times milligrams per liter times 
0.0027. 

Suspended-sediment load (tons per day) is a general term that refers to material in suspension. It is not 
synonymous with either discharge or concentration. 

Total-sediment discharne or total-sediment load (tons per day) is the sum of suspended-sediment discharge 
and the bedload discharge. It is the total quantity of sediment, as measured by dry mass, that passes a 
section in a given time. 

Total-sediment load or total load is a term which refers to the total sediment (bed load plus suspended- 
sediment load) that is in transport. It is not synonymous with total-sediment discharge. 

Sodium- adsorption-ratio (SAR) is the expression of relative activity of sodium ions in exchange reactions with 
soil and is an index of sodium or alkali hazard to the soil. Waters range In respect to sodium hazard from those 
which can be used for irrigation on almost all soils to those which are generally unsatisfactory for irrigation. 

Solute is any substance that is dissolved in water. 

Specific conductance is a measure of the ability of water to conduct an electrical current. It is expressed in 
microslemens per centimeter at 2S*C. Specific conductance is related to the type and concentration of ions in 
solution and can be used for approximating dlssolved-sollds concentration in water. Commonly, the concentration of 
dissolved solids (in milligrams per liter) is about 65 percent of the specific conductance (in microslemens). This 
relation is not constant from stream to stream, and it may vary in the same source with changes in the composition 
of the water. 

Stane-dlscharRe relation is the relation between gage height (stage) and the volume of water, per unit of time, 
flowing in a channel. 

Streamf low is the discharge that occurs in a natural channel. Although the term "discharge" can be applied to 
the flow of a canal, the word "streamflow" uniquely describes the discharge in a surface stream course. The term 
"streamflow" is more general than "runoff." Streamflow may be applied to discharge whether or not it is affected 
by diversion or regulation. 

Substrate is the physical surface upon which an organism lives. 

Natural substrate refers to any naturally occurring emersed or submersed solid surface, such as a rock or 
tree, upon which an organism lives. 

Artificial substrate is a device which is purposely placed in a stream or lake for colonization of 
organisms. The artificial substrate simplifies the conmunlty structure by standardizing the substrate from 
which each sample is taken. Examples of artificial substrates are basket samplers (made of wire cages filled 
with clean streamside rocks) and multlplate samplers (made of hardboard) for benthic-organlsm collection and 
plexiglass strips for periphyton collection. 

Surface area of a lake is the area, in square miles or acres, outlined on the latest U.S. Geological Survey 
topographic map as the boundary of the lake and measured by a planimeter. In localities not covered by topographic 
maps, the areas are computed from the best maps available. Areas shown are for the lake stage at the time the map 
was made. 

Surficial bed material is the part (upper 0. 1 to 0.2 ft or 0.03 to 0. 06 m) of the bed material that is sampled 
by using U.S. Series Bed-Material Samplers. 

Suspended (as used in tables of chemical analyses) refers to the amount (concentration) of undissolved material 
in a water-sediment mixture. The water-sediment mixture is associated with (or sorbed on) the material retained on 
a 0.45-micrometer filter. 

Suspended, recoverable is the amount of a given constituent that is in solution after the part of a 
representative water-suspended sediment sample that is retained on a 0.4S-micrometer membrane filter has been 
digested by a method (usually using a dilute acid solution) that results in dissolution of only readily soluble 
substances. Complete dissolution of all the particulate matter is not achieved by the digestion treatment; 
thus, the determination represents something less than the "total" amount (that is, less than 95 percent) of 
the constituent present in the sample. To achieve comparability of analytical data, equivalent digestion 
procedures would be required of all laboratories performing such analyses because different digestion 
procedures are likely to produce different analytical results. 

Determinations of "suspended, recoverable" constituents are made either by analyzing portions of the 
material collected on the filter or, more conmonly, by difference, based on determinations of (1) dissolved 
and (2) total recoverable concentrations of the constituent. 

Suspended, total is the total amount of a given constituent In the part of a representative water-suspended 
sediment sample that is retained on a 0.45-mlcrometer membrane filter. This term is used only when the 
analytical procedure assures measurement of at least 95 percent of the constituent determined. A knowledge of 
the expected form of the constituent in the sample, as well as the analytical methodology used, is retjuired to 
determine when the results should be reported as "suspended, total." 

Determinations of "suspended, total" constituents are made either by analyzing portions of the material 
collected on the filter or, more commonly, by difference, based on determinations of (1) dissolved and 
(2) total concentrations of the constituent. 



22 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 



TaTonorov is the division of biology concerned with the classification and naming of organisms. The 
classification of organisms is based upon a hierarchical scheme beginning with Kingdom and ending with Species at 
the base. The higher the classification level, the fewer features the organisms have in cotmon. For example, the 
taxonomy of a particular mayfly, HexaRenla llmbata is the following: 

Kingdom Animal 

Phylum Arthropoda 

Class Insects 

Order Ephemeroptera 

Family Ephemerldae 

Genus HexaRenla 

Species Hexanenla llmbata 

ThermoRraph is a themiometer that continuously and automatically records, on a chart, the water temperature of 
a stream. "Temperature recorder" is the term used to indicate the presence of a thermograph or a digital mechanism 
that records water temperature in a digital format on punched paper tape. 

Tlme-welRhted average is computed by multiplying the number of days in the sampling period by the 
concentrations of individual constituents for the corresponding period and dividing the sum of the products by the 
total number of days. A time-weighted average represents the composition of water that would be contained in a 
vessel or reservoir that had received equal quantities of water from the stream each day for the year. 

Tons per acre-foot indicates the dry mass of dissolved solids in 1 acre-foot of water. It is computed by 
multiplying the concentration in milligrams per liter by 0.00136. 

Tons per day (T/DAY) is the quantity of a substance in solution or suspension that passes a stream section 
during a 2'i-hour period. 

Total load (tons) is the total amount of any individual constituent, as measured by dry mass or volume, that 
is dissolved in a specific amount of water (discharge) during a given time. It is computed by multiplying the 
total discharge, times the milligrams per liter of the constituent, times the factor 0.0027, times the number of 
days. 

Total, recoverable is the amount of a given constituent that is in solution after a representative water- 
suspended sediment sample has been digested by a method (usually using a dilute acid solution) that results in 
dissolution of only readily soluble substances. Complete dissolution of all particulate matter is not achieved by 
the digestion treatment: thus, the determination represents something less than the "total" amount (that is, less 
than 95 percent) of the constituent present in the dissolved and suspended phases of the sample. To achieve 
comparability of analytical data, equivalent digestion procedures would be required of all laboratories performing 
such analyses, because different digestion procedures are likely to produce different analytical results. 

Total Is the total amount of a given constituent in a representative water-suspended sediment sample, 
regardless of the constituent's physical or chemical form. This term is used only when the analytical procedure 
assures measurement of at least 95 percent of the constituent present in the dissolved and suspended phases of the 
sample. A knowledge of the expected form is required to judge when the results should be reported as "total." 
(Note that the word "total" does double duty hertBe, Indicating both that the sample consists of a water-suspended 
sediment mixture and that the analytical method determines all the constituent in the sample.) 

Turbidity of a sample is the reduction of transparency due to the presence of particulate matter. In this 
report it is expressed in Nephelometric turbidity units (NTU), obtained from the Nephelometric method for turbidity 
determination which measures the Intensity of light scattered by suspended particles at 90" from the path of 
Incident light source. 

Water year in U.S. Geological Survey reports dealing with surface-water supply is the 12-month period, October 
1 through September 30. The water year is designated by the calendar year in which it ends and which Includes 9 of 
the 12 months. Thus, the year ending September 30, 1993, is called the "1993 water year." 



WDR Is used as an abbreviation for "Water-Data 
previously published State annual basic-data reports. 



Reports" in the sunnary REVISIONS paragraph to refer to 



WeiKhted average is used in this report to indicate discharge-weighted average. It is computed by multiplying 
the discharge for a sampling period by the concentrations of individual constituents for the corresponding period 
and dividing the sum of the products by the sum of the discharges. A discharge-weighted average approximates the 
composition of water that would be found in a reservoir containing all the water passing a given location during 
the water year after thorough mixing in the reservoir. 



WSP is used as an abbreviation for "Water-Supply Paper" in reference to previously published reports. 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 23 

PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS 

The U.S. Geological Survey publishes a series of manuals describing procedures for planning and conducting 
specialized work in water-resources investigations. The material is grouped under major subject headings called 
books and is further divided into sections and chapters. For example, Section A of Book 3 (Applications of 
Hydraulics) pertains to surface water. The chapter, the unit of publication, is limited to a narrow field of 
subject matter. This format permits flexibility in revision and publication as the need arises. 

The reports listed below are for sale by the U.S. Geological Survey, Map Distribution, Box 2S286, MS 306, 
Denver Federal Center, Denver, CO 80225. Prepayment is required. Remittance should be sent by check or money 
order payable to U.S. Geological Survey, Department of the Interior. Prices are not included because they are 
subject to change. Current prices can be obtained by writing to the above address. When ordering or Inquiring 
about prices for any of these publications, please give the title, book number, chapter number, and "U.S. 
Geological Survey Techniques of Water-Resources Investigations." 

1-Dl. Water temperature--influential factors, field measurement, and data presentation, by H.H. Stevens, Jr., 
J.F. Ficke, and G.F. Smoot: USGS--TWRI Book 1, Chapter Dl. 1975. 65 pages. 

1-D2, Guidelines for collection and field analysis of ground-water samples for selected unstable constituents, 
by W.W. Wood: USGS--TWRI Book 1, Chapter D2. 1976. 24 pages. 

2-Dl. Application of surface geophysics to ground-water investigations, by A.A.R. Zohdy, G.P. Eaton, and 
D.R. Mabey: USGS--TWRI Book 2, Chapter Dl. 1974. 116 pages. 

2-D2. Application of seismic-refraction techniques to hydrologic studies, by F.P. Haeni : USGS — TWRI Book 2, 
Chapter D2 1988. 86 pages. 

2-El. Application of borehole geophysics to water-resources investigations, by W.S. Keys, and L.M. MacCary: 
USGS — TWRI Book 2, Chapter El. 1971. 126 pages. 

2-E2. Borehole geophysics applied to ground-water investigations, by W. Scott Keys: USGS — TWRI Book 2, Chapter 
E2. 1990. 150 pages. 

2-Fl. Application of drilling, coring, and sampling techniques to test holes and wells, by Eugene Shuter and 
Warren E. Teasdale: USGS — TWRI Book 2, Chapter Fl. 1989. 97 pages. 

3-Al. General field and office procedures for indirect discharge measurements, by M.A. Benson and 
Tate Dalrymple: USGS--TWRI Book 3, Chapter Al. 1967. 30 pages. 

3-A2. Measurement of peak discharge by slope-area method, by Tate Dalrymple and M.A. Benson: USGS — TWRI 
Book 3, Chapter A2. 1967. 12 pages. 

3-A3. Measurement of peak discharge at culverts by indirect methods, by G.L. Bodhaine: USGS — TWRI Book 3, 
Chapter A3. 1968. 60 pages. 

3-A4. Measurement of peak discharge at width contractions by indirect methods, by H.F. Matthai: USGS — TWRI 
Book 3, Chapter A4. 1967. <i4 pages. 

3-A5. Measurement of peak discharge at dams by indirect methods, by Harry Hulsing: USGS — TWRI Book 3, 
Chapter A5. 1967. 29 pages. 

3-A6. General procedure for gaging streams, by R.W. Carter and Jacob Davidian: USGS — TWRI Book 3, Chapter A6. 
1968. 13 pages. 

3-A7. Stage measurements at gaging stations, by T.J. Buchanan and W.P. Somers : USGS--TWRI Book 3, Chapter A7. 
1968. 28 pages. 

3-A8. Discharge measurements at gaging stations, by T.J. Buchanan and W.P. Somers: USGS--TWRI Book 3, 
Chapter A8. 1969. 65 pages. 

3-A9. Measurement of time of travel in streams by dye tracing, by F.A. Kilpatrick and J.F. Wilson, Jr.: USGS — 
TWRI Book 3, Chapter A9. 1989. 27 pages. 

3-AlO. Discharge ratings at gaging stations, by E.J. Kennedy: USGS--TWRI Book 3, Chapter AlO. 198'i. 59 pages. 

3-All. Measurement of discharge by moving-boat method, by G.F. Smoot and C.E. Novak: USGS--TWRI Book 3, 
Chapter All. 1969. 22 pages. 

3-A12. Fluorometric procedures for dye tracing, by J.F. Wilson, Jr., E.D. Cobb, and F.A. Kilpatrick: USGS--TWRI 
Book 3, Chapter A12. 1986. 41 pages. 

3-A13. Computation of continuous records of streamflow, by E.J. Kennedy: USGS--TWRI Book 3, Chapter A13. 1983. 
S3 pages. 

3-A14. Use of flumes in measuring discharge, by F.A. Kilpatrick and V.R. Schneider: USGS--TWRI Book 3, 
Chapter Al*. 1983. 46 pages. 

3-A15. Computation of water-surface profiles in open channels, by Jacob Davidian: USGS--TWRI Book 3, 
Chapter AIS. 1984. 48 pages. 

3-A16. Measurement of discharge using tracers, by F.A. Kilpatrick and E.D. Cobb: USGS--TWRI Book 3, Chapter A16. 
1985. 52 pages. 



24 WATER RESOURCES DATA--CALIFORHIA, WATER YEAR 1993 

3-A17. Acoustic velocity meter systems, by Antonlus Laenen: USGS--TWRI Book 3, Chapter A17. 1985. 38 pages. 

3-A18. Determination of stream reaeration coefficients by use of tracers, by F.A. Kilpatrick, R.E. Rathbun, N. 

Yotsukura, G.W. Parker, and L.L. DeLong: USGS--TWRI Book 3, Chapter A18. 1989. 52 pages. 
3-A19. Levels of streamflow gaging stations, by E.J. Kennedy: USGS--TWRI Book 3, Chapter A19. 1990. 27 pages. 

3-Bl. Aquifer-test design, observation, and data analysis, by R.W. Stallman: USGS — TWRI Book 3, Chapter Bl. 
1971. 26 pages. 

3-B2. Introduction to ground-water hydraulics, a programned text for self-instruction, by G.D. Bennett: USGS — 
TWRI Book 3, Chapter B2. 1976. 172 pages. 

3-B3, Type curves for selected problems of flow to wells in confined aquifers, by J.E. Reed: USGS--TWRI Book 3, 
Chapter B3. 1980. 106 pages. 

3-B4. Regression modeling of ground-water flow, by Richard L. Cooley and Richard L. Naff: USGS--TWRI: Book 3, 
Chapter B'l. 1990. 232 pages. 

3-BS. Definition of boundary and Initial conditions in the analysis of saturated ground-water flow ay8tem8--An 
introduction, by O.L. Franke, T.E. Reilly, and G.D. Bennett: USGS--TWRI Book 3, Chapter B5. 1987. 15 pages. 

3-B6. The principle of superposition and its application in ground-water hydraulics, by T.E. Reilly, O.L. Franke, 
and G.D. Bennett: USGS- -TWRI Book 3, Chapter B6. 1987. 28 pages. 

3-B7. Analytical solutions for one-, two-, and three-dimensional solute transport in ground-water systems with 
uniform flow, by Ellezer J. Wexler: USGS--TWRI Book 3, Chapter B7. 1992. 190 pages. 

3-Cl. Fluvial sediment concepts, by H.P. Guy: USGS--TWRI Book 3, Chapter CI. 1970. 55 pages. 

3-C2. Field methods for measurement of fluvial sediment, by H.P. Guy and V.W. Norman: USGS--TWRI Book 3, Chapter 
C2. 1970. 59 pages. 

3-C3. Computation of fluvial sediment discharge, by George Porterfield: USGS--TWRI Book 3, Chapter C3. 1972. 
66 pages. 

4-Al. Some statistical tools in hydrology, by B.C. Riggs: USGS--TWRI Book A, Chapter Al . 1968. 39 pages. 

♦-A2. Frequency curves, by H.C. Riggs: USGS--TWRI Book A, Chapter A2. 1968. 15 pages. 

♦-B1. Low-flow investigations by H.C. Riggs: USGS--TWRI Book d , Chapter Bl. 1972. 18 pages. 

*-B2. Storage analyses for water supply, by H.C. Riggs and C.H. Hardison: USGS--TWRI Book A, Chapter B2. 1973. 
20 pages . 

♦-B3. Regional analyses of streamflow characteristics, by H.C. Riggs: USGS--TWRI Book A, Chapter B3. 1973. 
IS pages. 

4-Dl. Computation of rate and volume of stream depletion by wells, by C.T. Jenkins: USGS — TWRI Book 4, Chapter 
Dl. 1970, 17 pages. 

S-Al. Methods for determination of inorganic substances in water and fluvial sediments, edited by M.J. Fishman 
and L.C. Friedman: USGS--TWRI Book 5, Chapter Al . 1989. 545 pages. 

S-A2. Determination of minor elements in water by emission spectroscopy, by PR. Bamett and E.C. Mallory, Jr.: 
USGS- -TWRI Book 5, Chapter A2. 1971. 31 pages. 

5-A3. Methods for the determination of organic substances in water and fluvial sediments, edited by R.L. Wershaw, 
M.J. Fishman, R.R. Grabbe, and L.E. Lowe: USGS--TWRI Book 5, Chapter A3. 1987. 80 pages. 

S-A4. Methods for collection and analysis of ac[uatic biological and microbiological samples, edited by L.J. 
Brltton and P.E. Greeson: USGS--TWRI Book 5, Chapter A4 . 1989. 363 pages. 

S'AS. Methods for determination of radioactive substances in water and fluvial sediments, by L.L. Thatcher, 
V.J. Janzer, and K.W. Edwards: USGS--TWRI Book 5, Chapter A5. 1977. 95 pages. 

S-A6. Quality assurance practices for the chemical and biological analyses of water and fluvial sediments, by 
L.C. Friedman, and D.E. Erdmann: USGS--TWRI Book 5, Chapter A6 . 1982. 181 pages. 

5-Cl. Laboratory theory and methods for sediment analysis, by H.P. Guy: USGS--TWRI Book 5, Chapter CI. 1969. 
58 pages. 

6-Al. A modular three-dimensional finite-difference ground-water flow model, by M.G. McDonald and A.W. Barbaugh: 
USGS-TWRI Book 6, Chapter Al. 1988. [variously paged) 

6-A2. Documentation of a computer program to simulate aquifer-system compaction using the modular finite- 
difference ground-water flow model, by S.A. Leake and D.E. Prudic: USGS--TWRI Book 6, Chapter A2. 1991. 
68 pages . 

7-Cl. Finite difference model for aquifer simulation in two dimensions with results of numerical experiments, by 
P.C. Trescott, G.F. Finder, and S.P. Larson: USGS--TWRI Book 7, Chapter CI. 1976. 116 pages. 

7-C2. Computer model of two-dimensional solute transport and dispersion in ground water, by L.F. Konikow and J.D. 
Bredehoeft: USGS--TWRI Book 7, Chapter C2. 1978. 90 pages. 



WATER RESOURCES DATA- -CALIFORNIA, WATER YEAR 1993 25 

7-C3. A model for simulation of flow in singular and interconnected channels by R.W. Schaffranek, R.A. Baltzer, 
and D.E. Goldberg: USGS--TWRI Book 7, Chapter C3 . 1981. 110 pages. 

8-Al. Methods of measuring water levels in deep wells, by M.S. Garber and F.C. Koopman: USGS--TWRI Book 8, 
Chapter Al. 1968. 23 pages. 

e-A2. Installation and service manual for U.S. Geological Survey manometers, by J.D. Craig: USGS--TWRI Book 8, 
Chapter A2. 1983. 57 pages. 

8-B2. Calibration and maintenance of vertical-axis type current meters, by G.F. Smoot and C.E. Novak: USGS — TWRI 
Book 8, Chapter B2. 1968. 15 pages. 



26 



WATER RESOURCES DATA-CALIFORNIA, WATER YEAR 1993 






EXPLANATION 
A GAGING STATION 

^ GAGING AND WATER-QUALITY 
STATION 

A GAGING AND WATER-QUALITY 
(TEMPERATURE. SEDIMENT) 
STATION 




10 KILOMETERS 



'''*"" "■(NOTE'^RL^f.'i^'^'f*:/"' "«t«-<I-ality stations in Alan>eda County 
(NOTE. Record for station 11313000 published in volume T) ''°'^^^- 



WATER RESOURCES DATA- -CALIFORNIA. WATER YEAR 1993 



27 




10 KILOMETERS 



EXPLANATION 
▲ GAGING STATION 

A GAGING AND WATER-QUALITY 
^ (CHEMICAL, TEMPERATURE) 
STATION 



Figure 7. Location of discharge and water-c[uallty stations in Contra Costa County. 
(NOTE: Record for station 11337000 published in volume 3.) 



28 



WATER RESOURCES DATA- -CALIFORNIA. WATER YEAR 1993 






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U 



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■^ **' ^ '^ -.^ihMtn/ . A GAGING AND WATER-QUALITY 

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EXPLANATION 



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i 1. J ^ \ 



11530500 N _ v;^ ! ;^' ; . 

I i ^ Blue iittk ' i 

j_ _\-. ^ -Jiiii-; li--- — 

HUMBOLDT CO 



5 

1-^ 



'0 MILES 



10 KILOMETERS 



Figure 8. Location of discharge and water-quality stations in Del Norte County. 



WATER RESOURCES DATA--CAI.IFORNIA, WATER YEAR 1993 



29 



O 




GAGING STATION 



114,79S6a-' ^1 B o CD T 



1T4770tfO 



> 1 Vy-^ - 



f---:* -^ .Vril^il.'l..- £ 



^^ & ^ 114774715 i 
11478500 1^7742^1; 

^.-: 44477450^* 
' r 11477475- 



A GAGING AND WATER-QUALITY 
▼ (SEDIMENT) STATION 



GAGING AND WATER-QUALITY 
(SEDIMENT, TEMPERATURE) 
STATION 

GAGING AND WATER-QUALITY 
(CHEMICAL, SEDIMENT) 
STATION 

POWERHOUSE 



1146M 



J147|5!50fl: 



lO 



■' lA, 






.s, 



-:^% 



'■^f^^^.if■■^'■f. • ,>''\...-„ 



^■ik" 



" ,.w: ';'■!■ 



1147650a. 



41475000 



10 



15 MILES 



Vfe. i I I I I I 

^S 5 10 15 20 KILOMETERS 






-:^;r^ 



MENDOCINO 



CO 



Figure 9. Location of discharge and water-quality stations In Humboldt County. 



30 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 



GLENN 



_ ^ !^^t! 



j\ .^"^ 1° 

ft:,- 





<p«Th-! 



NiK> 



■ V 



Bftftiett Sprs- 



•'■5-) ^ ^ 

j ,. "\" ' - I — ' r\ 

^1' 11450000^ 



^~::I( 
■«!:■ 



K ■ E 

^' l.i;i.<.'.'i!e <"„> ■ 






;0 



\ 



"yli 



\'i 



!.'« V,..- 



Oak J-' 



114^1300 



EXPLANATION 

GAGING STATION 

RESERVOIR SITE AND 
CONTENTS 



T^ 



^.S<i^.Cx^'. 






■1 .,,,4 






\ 11449500 

; ■'.■ 'vn / 



,'''.r,e 



^y .ni -1T451000 



V 



Ln's-er i.i>K« 



/YOLO 
^ CO 






o\ 



^^^%l^' 



r 



10 MILES 



V 



i^J ' 






r 



10 15 KILOMETERS 



V-'Hl*'^ 



-7< 



Figure 10. Location of discharge stations in Lake County. 
(NOTE: Records for stations imgSOO through 11A51300 
published in volume A.) 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



31 



<ri 



.«. 



.,j.i,,y.-.^^ 



"%. \ 



t^aiion 



4 ^t^^'^\r- V-.. "^ 

OiHon Btac^v-' <i 



•'VCv 



EXPLANATION 
A GAGING STATION 



vr^.iii^ Po:Pt: VX' • — y 



Tomales. 



':-^''^^^^'t^ 















\f 



114595001 , 

!/ ...>\.-i-A ' (:>ie-.it ^11468400- ^^^^' -•-*"'^ 



- - - - -^--;-4- - - _..«,^_j;..._>>^.- 




\ _ li. iipre^t i Wqod3c.r>._ /'iVe^f^U^ ^^ 

^.Manri Citv' 




10 MILES 



10 KILOMETERS 



Figure 11. Location of discharge stations in Marin County. 



32 



WATER RESOURCES DATA--CALIFORNIA. WATER YEAR 1993 



^^OLDI^ 99j^^i TRINITY. 






CO _. S H 



V-.J147580(W^,>>-:rfv,-^ -- ,-'r^--.y-.^A^ S.. J 



4jf,^, 






NMUtfTl^t^l 






•( 



O 

o 






11475560 TL^.,: 



iwrltiwd^ ""yia ■- .1,' 






Pet. , 1 

- .^ — tlr 



■fi 









.^-^ % 11472200!^^ 

1 14685€' ;>:m^ E r^ o^Lc Jj,^-^: ' ' 
.^, "^^=. .. ^? ^11471099^ > ^ . 

'■"""■^ ., ..... -^^^ ^^"i-ii^iooaA , , 5 ^ 



\U z 
"■ ' z 

o 
o 



St.. 1 




EXPLANATION 



, V.-- - 



▲ GAGING STATION 

*" ^ GAGING AND WATER-QUALITY 
(TEMPERATURE) STATION 

QUALITY 
PERATURE, 
"S.JW?*4ifeiVl. SEDIMENT) STATION 

" •^-*^^''-'-"' ~T|^''''^ A GAGING AND WATER-QUALITY 

'■',-. .""""1)14620^10' O (SEDIMENT) STATION 



■^>^W ■LMiftus^ J|r GAGING AND WATER- 
'"r-'n^^ ^ (CHEMICAL, TEMPEI 






i!?^--iii4«Z5at''.C 



.- o 



..^ar- 



•«^ -Sx- 



.'.t-,.'. A_G '■|' 









7, " "^ *■ r 



Ml iin..| 



114^7590 



:-^. ->--^^ 









■-.-i' e^Mi. 









CO 



.^.»w^- 



SONOI 



10 MILES 

_J 



I — I — r 

5 10 KILOMETERS 



Figure 12. Location of discharge and water-quality stations In Mendocino County. 



WATER RESOURCES DATA--CALIFORHIA, WATER YEAR 1993 



33 



SAHTA .. 
CRUZ CQ\ 



^^.t-t 



\ 



4L 






ti- 



>'^. 



MfyiW*^' 



»«^ - T^^ 



.^.. 



Kvii- O^cnt 'n 



EXPLANATION 
▲ GAGING STATION 

X GAGING STATION EQUIPPED WITH 
^ A TELEPHONE, RADIO, OR DATA- 
COLLECTION PLATFORM 



inSlTOfrsr- 



^ GAGING (DATA-COLLECTION PLATFORM) 



■-•.% 



AND WATER-QUALITY (SEDIMENT) 
STATION 

# GAGING (MODEM) AND WATER-QUALITY 
(CHEMICAL, SEDIMENT) STATION 

A- GAGING AND WATER-QUALITY 
(SEDIMENT) STATION 



NOTE: The station with no number is a 
miscellaneous measurement site 



-9 



tl 143000 ":"'^ 



V1^20q0 \^j1]51300 s 



N 



11 - 



^^ 






o 







v^-.. 



'"' -A. 



11149900 



'i!-* 






11150500 



■,S^ 



c 



• ■^,:--\ CO 



%sri!?S-r SAN LUIS OBISPO CO 



10 MILES 



I I I 

5 10 KILOMETERS 



Figure 13. Location of discharge and water-quality stations in Monterey County. 



34 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 






6rth 






<G ^ 






/ 



v-<: 






Afi 



Afe 






a*"; 



-"^^Vv ^ e^ 



'K^^^"" 



^^V" 













«4i^-. 






s 



EXPLANATION 
▲ GAGING STATION 



'■ '^ I Hennessey \ J\ \ \ I 

- - ' '.Y^j^umerltjrd Atlas Pkl 

-^ --Vo;n^Pnt458(K)(^.^7'fV 

' V^' - V^\ A^' ^ -A 



ov ^ 



A GAGING AND WATER-QUALITY 
^ (SEDIMENT, CHEMICAL) STATION 

-h: RESERVOIR SITE AND CONTENTS 




10 MILES 
J 



10 KILOMETERS 



Figure 14. Location of discharge and water-quality stations in Napa County. 
(NOTE: Record for station 11453900 published in volume 4.) 



WATER RESOURCES DATA--CALIFORmA, WATER YEAR 1993 



35 



. CLARA CO ( 



s^ X; ^^^ 



Y '■^Sjf ^ . >\ -" Gov't'...-.. 

Hpy.ri^...... ....^t-.--"---«^-is 



*> 
% 







^ f "T^i -*111565l)0 






. x 






*s^ 









X 



'«», ■' X 



^STANI>ARO 



r-AWAJt..i.T:'. 



S ^' 

..-..-j(£-f\-.^^ /. 



1, ^^ «*fk ^A$ .X 



r 
EXPLANATION Q. 

▲ GAGING STATION 

^ GAGING STATION EQUIPPED WITH 
A DATA-COLLECTION PLATFORM 









iO 



Si. .,..^.rr,. 



5 10 MILES 



I I r 

5 10 KILOMETERS 



Figure 15. Location of discharge stations in San Benito County. 



36 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 




ancjsco 
l.y' \ \ ^^, Bruno . 

s., .;"..-:<^,4:^'?ix^%:- 1 1 1 62765^ 

i '--^iirlingatne'-^^.-San Wateo ^f^"^ 




Moss 8eac«|o 



rtsrV Mcciii 



^ 

cX 



i -ba^...... .^4-k V-^\ ^-^^-*'. 

U? lA iH*" ^-^<5r 

11162576. V^-\"t -\ 



Y 



it'.L.^^'l-a fjkJ?V<H 



EXPLANATION 
A GAGING STATION 

X GAGING STATION EQUIPPED WITH 
^ A MODEM 

f GAGING AND WATER-QUALITY 
(SEDIMENT) STATION 

GAGING (MODEM) AND WATER-QUALITY 



f 

^ 



( SEDIMENT) STATION 

WATER-QUALITY (CHEMICAL, 
TEMPERATURE) STATION 



■"'Viy 



^-^'^rf/, 






3-^ 



■*H. 



.^ 



\ — 



NOTE: The four stations with no number are 
miscellaneous measurement sites. 






P'-itwn Poin^-^N. 



■•<j'. 



Crr" 



Y 1 ^^ 



0° 





10 MILES 

J 



10 KILOMETERS 



I \ 



Figure 16. Location of discharge and water-quality stations In San Francisco and San Mateo Counties. 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



37 



11148900 



11149400. 



^«OMTEHEV CD 



'^S 



11148S00. 



EXPLANATION 
A GAGING STATION 

f GAGING AND WATER-QUALITY 
(SEDIMENT) STATION 



▼Tl 147500' 
111^/070 

<' S A N^ \ L UiJ f 



f 






GAGING (TELEPHONE OR RADIO) 
AND WATER-QUALITY (SEDIMENT) 
STATION 



i'^. 



O 6, I S- P O 



"X, 



W : '-'^ ^ 











'■ .-■ •.-rw--;r:*" ■■■..-, 



5 10 MILES 

1 - I 'l l' 

5 10 15 KILOMETERS 



,::;-:l 



^.__: 



Figure 17. Location of discharge and water-quality stations In San Luis Obispo County. 



38 



WATER RESOURCES DATA— CALIFORNIA. WATER YEAR 1993 



\ 






.t*to^. 










./X. _ i^. 



GO 









* V^V V Sarfta,^l5la^v.^S 11168000 x^ --#;i.««".«on% - -.. r ..^, » 

2 '' ' "Jc's ^r.ii<0 I.', , : • .■ IP c'^Ai-'li^Cr C^ '-A -'^ v.?* '-:'~ : ' 




% 



o 
o 






EXPLANATION 
GAGING STATION 















^ GAGING STATION EQUIPPED WITH 
A TELEPHONE OR RADIO 



, ^ "-X ,. -'W 

! Vs.' ' \ > ■■/' 

•^''•«*« \t5ilroy ,...;_, 



.'-.d«.':st..c.(.j»#^>, 

•.„ ^-^..8«li SSanop.. 






..51..'. 



O^^ 



oW 




,<--r^ 



\i 



;^^x&e^^ 



Q 

r- 
CO 






/ 

v.. 



s>^** 



10 MILES 

J 



10 KILOMETfBS 



Figure 18. Location of discharge stations in Ssinta Clara County. 



WATER RESOURCES DATA— CALIFORNIA. WATER YEAR 1993 



39 









^<-f 



r 






1 ff r 

f . I" ■ f' 1 







l)av«?ripO''f 




\ 



Santa C*ti2 



Meckel 

~^ >oH. \ " -" -nT59200 



EXPLANATION 
▲ GAGING STATION 

2 GAGING STATION EQUIPPED WITH 
A DATA-COLLECTION PLATFORM 
OR TELEPHONE 

^ GAGING (TELEPHONE OR MODEM) 
AND WATER-QUALITY (SEDIMENT) 
STATION 



Beach . ^~~ ^ 



h-d/ 



K 



Vaft^ 



WarSv"'^'*'^ 



/ ; ;SAN BENITO 



iOMTEBEY CO 



CO 



■^ 



Mos<. i 



10 MILES 



1 

'0 KILOMETERS 



Figure 19. Location of discharge and water-quality stations in Santa Cruz County. 



40 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 






l^u. 



OREGON 



iwr 



•■■•p^ \y" \j' 



r"- 



v,\ 115215004 - ife 2: ^' -y . /T'f lis; 



-•^Ki.-J^'-?^^5"** 



X .._i*^^:»._vVi3Hj..." ,- ;■■■ 

■J ( ^ . ,.•+-.-.• ^s ,. ' 
ui ,' ■• 



■^ 11516510 

11516530 
11517500 



Y 






11519500 

▲ 

s 




lis iJt:-."^'*y . 



:, f:xpj^-\, 







;i-4-_ 



^^> 



10 



.x^^ 



.<^^ 



.-rs s * . 113§7S00 

-£ ...... iZ^._. A.,.:: 



20 MILES 



-T I r" 

10 20 30 KILOMETERS 



SHASTA CO 



EXPLANATION 

^ GAGING STATION 

"A- RESERVOIR SITE AND CONTENTS 



Figure 20. Location of discharge stations In Siskiyou County. 
(NOTE: Records for station 11367500 published In volume A.) 



WATER RESOURCES DATA— CALIFORNIA, WATER YEAR 1993 



41 






- ^ 

. \X '. 

"'-a*. 



^^j-:^li4S3ZDDr 









1146750B \-\ , 



'^"'^■- fc--?!S 







y ^<^*( 



X* 



114631 7(rA..^^ ; 









\" 



9 






^^ <.*is»o*a(k>n 



8% 



*'f"**^^''' ■^ ^11 455200 V 

^ L.^.... : >•>. '■::x;^ir^4i^640oo - . {. ' ■ 

-% f -— tl4653^\ ^^-^- - - \;-- 








/Mt>i!f Rio U S 



. ■. V 



^ *lI4Sg!90* J^ 



- > -9 

-■■/ . ^ 
T , ,-.j.«.sr,v 

«: HOC- 












^\**»v Valley foe? 



EXPLANATION '-^ 

A GAGING STATION 

A_ GAGING AND WATER-QUALITY 

^ (CHEMICAL, SEDIMENT) STATION 

▲ GAGING AND WATER-QUALITY 
^ (TEMPERATURE) STATION 






\ ^"^'V-^:;:; 



Ocio.-- ©fc*f'i- 









\ 

•"M. 









SI 



5 10 MILES 

h-r^^ ' 

5 10 KILOMETERS 



>i PABLO/bAY "* 
/ 

/ 



Figure 21. Location of discharge and water-quality stations in Sonoma County. 



42 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 






,^.;-; ... 






..h 



- - -J 



-si/'^;- 



"■''^■-x}'"; - .-...r^<;k....». "j, O'/ 



, — ^ . ■^ •■ 



^^^■ 



«f- 



'l t-, , 



11523100 

" ^ i 



-*' •. ■■■• ^— .' 



■,"H 



r.': 









■:«— .irtcn x^T 'v • 



V,-r _- 






sV 



■V 



IS/'^'^""^' 






Sim M<^ 

-"r 

O j *! 1528700 -^- i'^^ 

O ^\ ;.~--% ^ ^ ^ ' .^ 

m " 'r ■? -.^ V- ■^-v?5' ; ,.^ 



~115M40e^,, /; 
^. . 11525500 'j"^ 

N h T/>.^ 1152^0 

^*" 11521^ ^ 



'■5>C ■ 



^:\ 







■ ■"*{;; 



,A^^.__1.._.. 



.et 



zfl^X- 



..fi. is 






«9 



I '-, 



.'>.i:(i\ 



11480500 V, ' 
'^ir«H)400 " 






* I - i 

^1 ■ / / 



I ' 



11480390 



u- 



^^ . f-. I 



! %. 

j 11474780 
.. -X^1 474781 _ 

»«■ »r- -.. > 






EXPLANATION 

A GAGING STATION 

A GAGING AND WATER-QUALITY 
^ (SEDIMENT, TEMPERATURE) 
STATION 

T~ WATER-QUALITY (SEDIMENT) STATION 
-^ RESERVOIR SITE AND CONTENTS 



( 



O 

o 



MENDOCINO CO 



■■..■• ..s, 



_L 



10 MILES 
_J 



I r 

5 10 KILOMETERS 



Figure 22. Location of discharge and water-quality stations in Trinity County. 



WATER RESOURCES DATA--CALIFORNIA, WATER YEAR 1993 43 



GAGING STATION AND WATER-QUALITY RECORDS 

Remark Codes 

The following remark codes may appear with the water-quality data in this report: 

PRINTED OUTPUT REMARK 

e Estimated value 

> Actual value is greater than value shown 

< Actual value is less than value shown 

K Results based on colony count outside the 

acceptable range (non-ideal colony 

count) 
L Biological organism count less than 

0.5 percent (organism may be observed 

rather than counted) 
D Biological organism count equal to or 

greater than 15 percent (dominant) 
& Biological organism estimated as dominant 

* Instantaneous strearaflow at the time of 

cross-sectional measurements 
Laboratory value 



NOTE: MBAS determinations made from January 1, 1970, through August 29, 1993, at the National Water (Quality 
Laboratory in Denver (Analyzing Agency Code 80020) are positively biased. These data can be corrected on the basis 
of the following equation, if concentrations of dissolved nitrate plus nitrite, as nitrogen, and dissolved chloride, 
determined concurrently with the MBAS data, are applied. 

MBASCOR - M - 0.0088N - 0.00019C 

where: 

MBASCOR - corrected MBAS concentration, in mg/L; 

M = reported MBAS concentration, in mg/L; 

N = dissolved nitrate plus nitrite, as nitrogen, concentration, in mg/L; and 

C "■ dissolved-chloride concentration, in mg/L. 

The detection limit of the new method is 0.02 mg/L; whereas, the detection limit for the old method was 0.01 mg/L. 
A detection limit of 0.02 mg/L should be used with corrected MBAS data from January 1, 1970, through August 29, 
1993. 



ARROYO GRANDE BASIN 
111A1280 LOPEZ CREEK NEAR ARROYO GRANDE, CA 



45 



LOCATION. --Lat 35'1A'08", long 120'28'17". in SE 1/A sec. 19, T.31 S., R.!* E., San Luis Obispo County, Hydrologic 
Unit 18060006, on right bank 3 . * mi north of Lopez Lake Spillway and 9.2 mi northeast of Arroyo Grande. 

DRAINAGE AREA. --20. 9 mi^. 

PERIOD OF RECORD. --July 1967 to current year. 
CHEMICAL DATA: Water year 1977. 
WATER TEMPERATURE: Water years 1968-72. 
SEDIMENT DATA: Water years 1968-72. 

GAGE. — Water-stage recorder and crest-stage gage. Elevation of gage is 580 ft above sea level, from topographic 
map. Prior to Oct. 31, ISSA, at site O.A mi downstream at different datum. 

REMARKS. — Records poor. Small diversions upstream from station for domestic use. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 2,830 ft^/s, Jan. 25, 1969, gage height, 9.26 ft in gage well, 
10.8 ft from floodmarks, site and datum then in use, from rating curve extended above 300 ft /s on basis of 
slope-area measurement of peak flow; maximum gage height, 9.62 ft. Mar. 1, 1983, site and datum then in use; 
minimum daily discharge, 0.30 ft^/s, Aug. 1, 1977. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 100 ff*/s and maximum (*): 



Date 



Time 



Discharge Gage height 
(ft^/s) (ft) 



Jan. 13 2200 
Feb. 23 0230 



325 

• 330 



6.53 
*6.59 



Date 
Mar. 27 



Minimum daily, 0.92 ff'/s, Oct. 1. 



Time 
2215 



Discharge 
(ft^/s) 



102 



Gage height 
(ft) 



DAY 



OCT 



DISCHARGE , 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.92 


2.2 


1.8 


8 


9 


13 


42 


20 


6.9 


5.9 


e3.6 


e3.1 


2.6 


2 


.98 


2.1 


1.8 


15 




12 


43 


19 


6.9 


5.7 


e3.6 


e3.1 


2.6 


3 


1.0 


2.0 


1.8 


9 


3 


12 


34 


18 


6.9 


5.7 


e3.5 


e3.1 


2.7 


4 


1.0 


2.0 


1.8 


7 


7 


12 


31 


17 


6.9 


6.2 


e3.5 


e3.2 


2.6 


5 


.99 


2.0 


1.8 


6 


9 


11 


27 


16 


6.9 


7.1 


e3.5 


e3.2 


2.7 


6 


.97 


2.0 


1.8 


9 


7 


11 


26 


16 


6.8 


6.2 


e3.5 


e3.1 


2.6 


7 


.95 


2.0 


3.3 


83 




11 


24 


17 


6.7 


5.9 


e3.4 


e3.0 


2.6 


8 


1.0 


2.1 


2.7 


54 




39 


23 


14 


6.7 


5.7 


e3.4 


2.9 


2.6 


9 


1.1 


2.0 


2.8 


53 




37 


21 


13 


6.4 


5.6 


e3.4 


3.1 


2.5 


10 


1.1 


1.9 


2.9 


67 




25 


20 


12 


6.1 


5.4 


e3.3 


3.1 


2.5 


11 


1.1 


2.0 


5.0 


60 




18 


20 


11 


6.1 


5.4 


e3.2 


3.0 


2.5 


12 


1.2 


2.0 


4.6 


60 




15 


18 


11 


6.1 


e5.1 


e3.2 


3.0 


2.6 


13 


1.3 


2.0 


4.2 


124 




13 


18 


11 


6.2 


e4.7 


e3.1 


3.0 


2.7 


14 


1.4 


1.9 


4.1 


128 




11 


17 


11 


6.0 


e4.4 


e3.1 


3.2 


2.8 


IS 


1.4 


1.9 


3.9 


89 




10 


16 


10 


5.8 


e4.3 


e3.1 


3.2 


2.8 


16 


1.4 


1.9 


3.8 


86 




10 


16 


9.6 


5.8 


e4.2 


e3.0 


3.1 


2.8 


17 


1.4 


1.9 


3.9 


105 




9.2 


16 


9.7 


6.0 


e4.1 


e3.0 


3.6 


2.8 


18 


1.4 


1.6 


3.8 


93 




14 


15 


10 


6.0 


e4.1 


e3.0 


3.3 


2.8 


19 


1.4 


1.8 


3.8 


64 




17 


13 


9.4 


6.0 


e4.1 


e3.0 


2.9 


2.7 


20 


1.4 


1.8 


3.7 


41 




20 


11 


8.9 


5.8 


e4.1 


e3.0 


2.8 


2.7 


21 


1.5 


1.8 


3.6 


31 




19 


11 


8.7 


6.8 


e4.0 


e3.0 


2.7 


2.7 


22 


1.6 


1.8 


3.5 


29 




19 


11 


8.3 


6.3 


e4.0 


e3.1 


2.7 


2.6 


23 


1.4 


1.8 


3.5 


24 




162 


11 


8.3 


6.3 


e3.9 


e3.1 


2.7 


2.7 


24 


1.4 


1.8 


3.4 


22 




98 


11 


8.1 


6.3 


e3.9 


e3.2 


2.7 


2.6 


2S 


1.5 


1.8 


3.3 


20 




98 


36 


7.7 


6.7 


e3.8 


e3.2 


2.6 


2.5 


26 


1.5 


1.8 


3.3 


18 




104 


50 


7.7 


6.4 


e3.8 


e3.1 


2.6 


2.5 


27 


1.5 


1.8 


3.3 


17 




66 


42 


7.6 


5.3 


e3.8 


e3.1 


2.6 


2.5 


28 


1.5 


1.8 


3.5 


16 




51 


49 


7.3 


6.2 


e3.7 


e3.2 


2.5 


2.5 


29 


2.5 


1.8 


17 


15 







36 


6.9 


6.1 


e3.7 


e3.2 


2.5 


2.4 


30 


4.1 


1.8 


25 


14 







26 


6.9 


6.0 


e3.7 


e3.2 


2.5 


2.4 


31 


2.4 





10 


14 







23 





6.1 





e3.1 


2.5 





TOTAL 


44.31 


57.3 


142.7 


1384. 


5 


935.2 


757 


341.1 


196.5 


142.2 


99.9 


90.6 


78.6 


MEAN 


1.43 


1.91 


4.60 


44. 


7 


33.4 


24.4 


11.4 


6.34 


4.74 


3.22 


2.92 


2.62 


MAX 


4.1 


2.2 


25 


128 


162 


50 


20 


6.9 


7.1 


3.6 


3.6 


2.8 


MIN 


.92 


1.8 


1.8 


6. 


9 


9.2 


11 


6.9 


5.8 


3.7 


3.0 


2.5 


2.4 


AC-FT 


88 


114 


283 


2750 


1850 


1500 


677 


390 


282 


198 


180 


156 


e Estimated. 



























A6 



ARROyO GRANDE BASIN 
111*1280 LOPEZ CREEK NEAR ARROYO GRANDE, CA- -Continued 



STATISTICS OF hDNTHLY MEAN DATA FOR WATER YEARS 1967 - 1993, BY WATER YEAR (WY) 
OCT NOV DEC JAN FEB MAR APR MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


2.86 


4.23 


6.79 


20.4 


26.9 


26.2 


13.0 


6.77 


4.43 


3.20 


2.75 


2.56 


MAX 


9.12 


13.6 


26.4 


145 


133 


133 


65.2 


46.1 


20.8 


13.8 


9.82 


6.30 


(WY) 


1984 


1984 


1984 


1969 


1969 


1983 


1983 


1983 


1983 


1983 


1983 


1983 


MIN 


1.03 


1.23 


1.58 


2.00 


2.00 


2.46 


2.08 


1.75 


1.38 


.72 


.44 


.82 


(WY) 


1978 


1978 


1991 


1991 


1991 


1977 


1977 


1990 


1972 


1977 


1977 


1977 



SUNMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



1852.20 
5.06 



FOR 1993 WATER YEAR 



WATER YEARS 1967 



1993 



150 



.82 

.86 



3670 
6.4 
2.2 
.98 



Feb 15 
Sep 27 
Sep 24 



4269.91 






11.7 






162 


Feb 


23 


.92 


Oct 


1 


.97 


Oct 


1 


330 


Feb 


23 


6.59 


Feb 


23 


8470 






25 






3.9 






1.8 







9.91 








37.3 






1983 


1.89 






1977 


1360 


Jan 


25 


1969 


.30 


Aug 


1 


1977 


.34 


Jul 


28 


1977 


2830 


Jan 


25 


1969 


9.62 


Mar 


1 


1983 


7180 








15 








3.8 








1.5 









BIG SUR RIVER BASIN 
111*3000 BIG SUR RIVER NEAR BIG SUR, CA 



47 



LOCATION. --Lat 36*14'45", long 121*46'20", in SW 1/A SW 1/4 sec. 29, T . 19 S., R.2 E., Monterey County, Hydrologlc 
Unit 18060006, on right bank at downstream side of bridge, 0.4 mi upstream from Post Creek, and 2.6 mi 
southeast of town of Big Sur. 

DRAINAGE AREA.— A6.5 mi^. 

PERIOD OF RECORD. --March 1950 to current year. Prior to October 1959, published as Sur River at Big Sur. 
CHEMICAL DATA: Water year 1977. 
WATER TEMPERATURE: Water years 1956-79. 

REVISED RECORDS.— WSP 1445: 1952(P), 1953(M). WSP 1715: 1951, drainage area. 

GAGE. — Water-stage recorder. Elevation of gage is 240 ft above sea level, from topographic map. Prior to 
Oct. 1, 1951, nonrecording gage at site 0.9 mi downstream at different datum. 

REMARKS. --Records fair except for estimated daily discharges, which are poor. No regulation or diversion 
upstream from station. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 10,700 ft^/s, Jan. 5, 1978, gage height, 14.30 ft, from^rating 
Curve extended above 6,800 ft /s on basis of slope-area measurement of peak flow; minimum daily, 2.6 ft /s, 
Aug. 23, 1977, Sept. 9, Oct. 29, Nov. 5, 1990. 

EXTREMES FOR CURRENT YEAR.— Peak discharges greater than base discharge of 1,500 ft^/s and maximum (*): 

Discharge Gage height Discharge 

Date Time (ft^/s) (ft) Date Time (ff*/s) 

Jan. 7 0245 1,650 7.50 Jan. 14 0300 *3,400 *9.25 

Minimum daily, 5.8 ft^/s, Oct. 1. 



Gage height 
(ft) 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


5.8 


14 


17 


283 


259 


548 


141 


74 


57 


639 


e26 


21 


2 


6.0 


12 


23 


281 


240 


496 


133 


73 


56 


838 


826 


20 


3 


6.3 


11 


46 


194 


222 


454 


128 


73 


56 


e38 


825 


20 


4 


6.5 


11 


29 


151 


208 


415 


124 


72 


60 


e38 


82S 


20 


5 


6.3 


11 


27 


127 


215 


381 


120 


70 


65 


e37 


e2S 


19 


6 


6.4 


10 


98 


313 


194 


352 


118 


69 


61 


037 


e25 


19 


7 


7.1 


11 


132 


1120 


197 


327 


115 


68 


60 


e36 


e24 


19 


8 


7.4 


10 


58 


744 


325 


305 


111 


67 


57 


e36 


e24 


18 


9 


7.6 


10 


187 


494 


366 


286 


109 


65 


55 


e35 


e24 


18 


10 


8.1 


11 


172 


450 


339 


269 


106 


63 


53 


e34 


e23 


19 


11 


7.9 


11 


301 


352 


309 


253 


104 


65 


51 


e33 


823 


18 


12 


7.9 


11 


146 


359 


277 


240 


101 


65 


50 


e32 


823 


17 


13 


7.8 


11 


103 


964 


257 


228 


99 


64 


48 


e32 


e23 


18 


14 


8.4 


11 


82 


2070 


241 


221 


98 


62 


47 


e31 


e23 


18 


15 


9.0 


11 


71 


1250 


228 


208 


96 


61 


46 


e30 


822 


20 


16 


9.2 


11 


63 


1110 


221 


199 


94 


60 


45 


29 


e22 


20 


17 


8.6 


12 


63 


1390 


268 


202 


122 


59 


46 


29 


e21 


20 


18 


8.2 


11 


60 


1250 


442 


187 


115 


59 


48 


27 


821 


22 


19 


8.2 


11 


54 


908 


852 


179 


100 


58 


47 


26 


821 


20 


20 


8.4 


12 


52 


964 


943 


171 


95 


58 


46 


26 


820 


20 


21 


10 


11 


49 


1220 


774 


165 


92 


57 


47 


27 


820 


20 


22 


9.7 


17 


47 


1220 


665 


159 


90 


55 


48 


27 


820 


20 


23 


9.0 


14 


46 


936 


788 


156 


88 


55 


48 


27 


820 


18 


24 


8.8 


13 


44 


738 


710 


166 


87 


60 


47 


27 


el9 


18 


25 


9.3 


13 


43 


606 


657 


167 


84 


72 


46 


29 


eig 


18 


26 


10 


13 


42 


513 


776 


171 


82 


69 


45 


30 


el9 


19 


27 


10 


14 


41 


448 


689 


172 


81 


67 


43 


29 


8l9 


19 


28 


11 


14 


131 


392 


613 


171 


79 


60 


42 


27 


el9 


18 


29 


46 


15 


267 


344 





156 


77 


57 


e41 


e27 


8l9 


18 


30 


56 


16 


198 


309 





148 


75 


56 


e40 


e27 


8l9 


18 


31 


20 




151 


285 





142 





59 





e27 


20 


___ 


TOTAL 


350.9 


363 


2843 


21785 


12275 


7694 


3064 


1974 


1501 


967 


679 


572 


MEAN 


11.3 


12.1 


91.7 


703 


438 


248 


102 


63.7 


50.0 


31.2 


21.9 


19.1 


MAX 


56 


17 


301 


2070 


943 


548 


141 


74 


65 


39 


25 


22 


MIN 


5.8 


10 


17 


127 


194 


142 


75 


56 


40 


25 


19 


17 


AC-FT 


696 


720 


5640 


43210 


24350 


15260 


6080 


3920 


2980 


1920 


1350 


1130 


e Estimated. 

























48 



BIG SUR RIVER BASIN 



lll^aOOO BIG SUR RIVER NEAR BIG SUR, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1950 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

17.5 
86.8 
1963 
5.08 
1991 



NOV 

'(7.0 
302 
1951 
*.97 
1991 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

103 

'i'i9 

1956 

7.52 

1991 



JAN 

224 

986 
1952 
8.27 
1991 



FEB 

262 

940 
1983 
11.3 
1977 



FOR 1992 CALENDAR YEAR 



23048.2 
63.0 



1280 Feb 15 
5.8 Oct 1 
6.2 Sep 30 



45720 
158 
20 
8.2 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



218 

964 
1983 
16.8 
1977 



146 

843 

1958 

9.15 

1977 



65.2 
333 
1983 
8.70 
1977 



FOR 1993 WATER YEAR 



54067. 


9 






148 








2070 




Jan 


14 


5. 


8 


Oct 


1 


6. 


3 


Oct 


1 


3400 




Jan 


14 


9. 


25 


Jan 


14 


107200 








372 








SO 








11 









35.3 
90.8 
1983 
6.17 
1977 



JUL 

22.6 

53.5 
1983 
4.94 
1977 



AUG 

16.7 

40.4 
1983 
3.80 
1977 



WATER YEARS 1950 



SEP 

15.0 
39.4 
1983 
4.52 
1961 

1993 



97.2 






319 




1983 


10.0 




1977 


4120 


Dec 


23 1955 


2.6 


Aug 


23 1977 


2,9 


Nov 


4 1990 


10700 


Jan 


5 1978 


14.30 


Jan 


5 1978 


70410 






216 






28 






9.3 







CARMEL RIVER BASIN *9 

llliiSZOO CARMEL RIVER AT ROBLES DEL RIO, CA 

LOCATION. --Lat 36*28'28", long 121°*3'A0". In Los Laureles Grant, Monterey County, Hydrologic Unit 18060012, on 
right bank 10 ft downstream from county road bridge at Robles del Rio, 0.2 mi downstream from Hitchcock 
Canyon, and 11 mi southeast of town of Carmel. 

DRAINAGE AREA.--193 mi^. 

PERIOD OF RECORD. — August 1957 to current year. 

REVISED RECORDS. --WSP 1715: Drainage area. 

GAGE. — Water-Stage recorder and crest-stage gage. Elevation of gage is 270 ft above sea level, from topographic 
map. Prior to June 1981, at site 150 ft upstream at same datum. 

REMARKS. — Records fair. Low flow regulated by Los Padres Reservoir 11 mi upstream, usable capacity, 

2,180 acre-ft, and San Clemente Reservoir « mi upstream, usable capacity, 796 acre-ft. Diversion from San 
Clemente Reservoir for municipal supply amounted to «,320 acre-ft for the current year. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 8.380 ft^/s, Feb. 28, 1983, gage height, 11.49 ft, from rating 
curve extended above 2,800 ft /s on basis of slope-area measurement at gage height 9.97 ft; no flow at times 
in some years. 

EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of Dec. 23, 1955, reached a stage of 11.7 ft from floodmarks, 
discharge, 6,930 ft /s, from slope-area measurement of peak flow. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,200 ft^/s and maximum (*): 

Discharge Gage height Discharge Gage height 

(ft^/s) (ft) Date Time (ff*/s) (ft) 



Date 



Time 



Jan. 


7 


0700 


1,510 


8.51 


Jan. 


14 


0615 


*5,100 


*11.17 



Feb. 19 



0945 



2,800 



9.74 



Minimum daily, 2.5 ft^/s, Nov. 4, 8-11. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


2.9 


2.9 


2.8 


174 


228 


677 


180 


67 


48 


el9 


5.3 


e4.7 


2 


3.0 


2.9 


2.8 


259 


215 


609 


166 


64 


53 


20 


5.4 


e4.7 


3 


3.1 


2.7 


3.6 


167 


201 


555 


156 


63 


79 


19 


5.5 


e4.7 


4 


3.1 


2.5 


3.1 


123 


187 


498 


147 


65 


48 


17 


5.4 


e4.8 


5 


3.1 


2.7 


3.0 


98 


189 


4 52 


139 


60 


53 


el5 


5.3 


e4.8 


6 


3.1 


2.7 


3.7 


94 


179 


413 


141 


60 


52 


el5 


5.1 


e4.8 


7 


3.0 


2.6 


4.2 


925 


175 


378 


137 


59 


43 


15 


5.2 


e4.8 


8 


3.0 


2.5 


3.5 


620 


320 


350 


132 


57 


35 


13 


4.9 


e4.8 


9 


3.0 


2.5 


3.3 


385 


349 


324 


127 


55 


32 


12 


4.8 


e4.8 


10 


3.0 


2.5 


3.4 


389 


324 


304 


124 


56 


29 


12 


5.0 


e4.8 


11 


3.0 


2.5 


5.9 


286 


299 


286 


119 


55 


29 


11 


5.0 


e4.8 


12 


3.1 


2.7 


12 


297 


268 


268 


116 


47 


35 


10 


4.9 


e4.8 


13 


3.1 


3.1 


8.7 


2600 


249 


254 


111 


41 


33 


9.5 


4.8 


e4.8 


14 


3.1 


2.9 


6.9 


3270 


235 


244 


108 


41 


29 


8.9 


4.8 


e4.8 


15 


3.1 


2.9 


6.1 


1330 


222 


232 


106 


42 


28 


9.1 


4.7 


e4.7 


16 


3.1 


2.9 


5.2 


1160 


215 


222 


102 


41 


28 


8.0 


4.7 


e4.7 


17 


3.1 


2.9 


4.9 


1370 


231 


220 


107 


39 


28 


9.2 


4.6 


e4.7 


18 


3.1 


2.9 


4.8 


1470 


441 


209 


124 


32 


e26 


9.4 


4.6 


e4.7 


19 


3.1 


2.9 


4.6 


933 


2140 


197 


el04 


30 


823 


9.6 


e4.6 


64.7 


20 


3.1 


3.0 


4.5 


723 


2050 


188 


e9g 


27 


25 


9.1 


e4.6 


e4.7 


21 


3.3 


3.0 


4.1 


798 


1380 


179 


91 


27 


28 


8.6 


e4.6 


e4.7 


22 


3.1 


3.0 


3.9 


859 


1050 


180 


90 


26 


28 


8.3 


e4.6 


e4.7 


23 


3.1 


3.0 


3.9 


659 


1040 


178 


88 


27 


30 


7.9 


e4.6 


e4.6 


24 


3.0 


2.9 


3.9 


540 


1050 


197 


86 


26 


27 


7.3 


e4.6 


e4.6 


25 


3.1 


2.8 


3.9 


458 


942 


192 


82 


26 


24 


7.0 


e4.6 


e4.6 


26 


3.1 


2.8 


3.8 


396 


1130 


283 


79 


26 


22 


6.5 


e4.6 


e4.6 


27 


3.2 


2.8 


3.8 


350 


900 


248 


76 


26 


21 


6.1 


e4.6 


e4.5 


28 


3.0 


3.0 


6.2 


314 


780 


246 


75 


26 


e20 


5.9 


e4.6 


4.5 


29 


3.0 


2.9 


65 


286 





213 


75 


27 


e20 


5.5 


e4.7 


4.4 


30 


3.1 


2.9 


197 


264 





190 


69 


28 


eig 


5.4 


e4.7 


4.4 


31 


3.0 




133 


245 





181 





29 





5.2 


e4.7 


""" 


TOTAL 


95.2 


84.3 


525.5 


21842 


16989 


9167 


3356 


1295 


995 


324.5 


150.1 


140.7 


MEAN 


3.07 


2.81 


17.0 


705 


607 


296 


112 


41.8 


33.2 


10.5 


4.84 


4.69 


MAX 


3.3 


3.1 


197 


3270 


2140 


677 


180 


67 


79 


20 


5.5 


4.8 


MIN 


2.9 


2.5 


2.8 


94 


175 


178 


69 


26 


19 


5.2 


4.6 


4.4 


AC -FT 


189 


167 


1040 


43320 


33700 


18180 


6660 


2570 


1970 


644 


298 


279 


e Es 


timated. 

























50 



CARMEL RIVER BASIN 



11143200 CARMEL RIVER AT ROBLES DEL RIO, CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1957 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



1.98 
23.3 
1984 
.000 
1960 



14.3 
135 
1984 
.000 
1960 



57.2 

480 
1984 
.000 
1960 



177 
769 

1969 

.26 

1991 



293 

1206 
1969 
.000 
1977 



263 

1855 
1983 
.011 
1977 



168 

1071 
1958 
.000 
1977 



53.3 
410 
1983 
.000 
1977 



16.6 
129 
1983 
.000 
1961 



5.01 

50.9 
1983 
.000 
1959 



1.49 
13.4 
1983 
.000 
1957 



1.35 
10.6 
1983 
.000 
1957 



SIMIARY STATISTICS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1957 



1993 



ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



19642.6 
53.7 



2090 Feb 15 

2.5 Nov 4 

2.6 Nov 4 



38960 
133 
5.1 
2.8 



54964.3 










151 






86.6 
442 

.050 


1983 
1977 


3270 


Jan 


14 


6260 


Mar 1 1983 


2.5 


Nov 




.00 


Aug 1 1957 


2.6 


Nov 




.00 


Aug 1 1957 


5100 


Jan 


14 


8380 


Feb 28 1983 


11.17 


Jan 


14 


11.49 


Feb 28 1983 


109000 






62700 




361 






205 




20 






4.1 




3.0 






.00 





CARMEL RIVER BASIN 



SI 



11143250 CARMEL RIVER NEAR CARMEL, CA 

LOCATION. — Lat 36'32'20", long 121°52'25", in Canada de la Segunda Grant, Monterey County, Hydrologic Unit 
18060012, on right bank 0.3 mi downstream from Potrero Canyon and 3 mi east of Carmel. 

DRAINAGE AREA. --246 mi^. 

WATER-DISCHARGE RECORDS 



PERIOD OF RECORD. — August 1962 to current year. 

GAGE. — Water-stage recorder and crest-stage gage. Elevation of gage is 45 ft above sea level, from topographic 
map. 

REMARKS. --Records fair. Low flow regulated by Los Padres Reservoir, usable capacity, 2,180 acre-ft, and San 
Clemente Reservoir, usable capacity, 796 acre-ft. Diversion from San Clemente Reservoir for municipal supply 
amounted to 4,320 acre-ft for the current year. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 9,590 ft^/s, Feb. 28, 1983, gage height, 18.22 ft, from rating 
curve extended above 2,800 ft /s on basis of slope-area measurement at gage height 17.35 ft; no flow for many 
days most years. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,200 ft^/s and maximum (*): 

Discharge Gage height Discharge Gage height 

Date Time (ft^/s) (ft) Date Time (ft^/s) (ft) 



Jan. 7 1045 
Jan. 14 0815 



1,210 
*4,940 



6.45 
*12.76 



Feb. 19 
Feb. 26 



1245 
0845 



2,870 
1,550 



Mo flow for many days . 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



9.82 
6.96 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


3.2 


363 


825 


219 


74 


32 


6.9 


.00 


.00 


2 


.00 


.00 


.00 


134 


341 


736 


203 


71 


53 


5.6 


.00 


.00 


3 


.00 


.00 


.00 


85 


323 


657 


190 


73 


47 


4.9 


.00 


.00 


4 


.00 


.00 


.00 


54 


308 


580 


175 


71 


67 


4.9 


.00 


.00 


5 


.00 


.00 


.00 


39 


299 


519 


169 


70 


53 


4.9 


.00 


.00 


6 


.00 


.00 


.00 


31 


292 


469 


160 


66 


57 


4.9 


.00 


.00 


7 


.00 


.00 


.00 


697 


279 


427 


158 


65 


54 


4.3 


.00 


.00 


8 


.00 


.00 


.00 


722 


463 


392 


152 


61 


43 


3.1 


.00 


.00 


9 


.00 


.00 


.00 


518 


537 


362 


146 


62 


40 


1.6 


.00 


.00 


10 


.00 


.00 


.00 


563 


504 


336 


139 


60 


34 


.50 


.00 


.00 


11 


.00 


.00 


.00 


428 


462 


315 


130 


64 


31 


.00 


.00 


.00 


12 


.00 


.00 


.00 


408 


421 


296 


130 


57 


33 


.70 


.00 


.00 


13 


.00 


.00 


.00 


2400 


387 


278 


127 


49 


35 


.00 


.00 


.00 


14 


.00 


.00 


.00 


3380 


364 


265 


123 


47 


30 


.00 


.00 


.00 


15 


.00 


.00 


.00 


1370 


346 


247 


119 


47 


29 


.00 


.00 


.00 


16 


.00 


.00 


.00 


1220 


331 


236 


117 


45 


29 


.00 


.00 


.00 


17 


.00 


.00 


.00 


1450 


336 


233 


119 


44 


28 


.00 


.00 


.00 


18 


.00 


.00 


.00 


1620 


527 


220 


140 


39 


28 


.00 


.00 


.00 


19 


.00 


.00 


.00 


1050 


2230 


206 


122 


35 


26 


.04 


.00 


.00 


20 


.00 


.00 


.00 


882 


2300 


196 


112 


32 


23 


1.0 


.00 


.00 


21 


.00 


.00 


.00 


965 


1610 


189 


106 


30 


24 


1.0 


.00 


.00 


22 


.00 


.00 


.00 


1030 


1190 


187 


102 


30 


23 


.18 


.00 


.00 


23 


.00 


.00 


.00 


892 


1130 


185 


99 


29 


e22 


.00 


.00 


.00 


24 


.00 


.00 


.00 


787 


1200 


203 


96 


30 


e20 


.on 


.00 


.00 


25 


.00 


.00 


.00 


700 


1050 


205 


94 


31 


el8 


.00 


.00 


.00 


26 


.00 


.00 


.00 


622 


1420 


391 


89 


30 


el6 


.00 


.00 


.00 


27 


.00 


.00 


.00 


553 


1130 


316 


86 


30 


el4 


.00 


.00 


.00 


28 


.00 


.00 


.00 


497 


946 


298 


83 


28 


el2 


.00 


.00 


.00 


29 


.00 


.00 


.00 


454 





258 


81 


27 


elO 


.00 


.00 


.00 


30 


.00 


.00 


.00 


420 





235 


78 


27 


9.5 


.00 


.00 


.00 


31 


.00 





.00 


390 





221 





29 





.00 


.00 





TOTAL 


0.00 


0.00 


0.00 


24364.2 


21089 


10483 


3864 


1453 


940.5 


44.52 


0.00 


0.00 


MEAN 


.000 


.000 


.000 


786 


753 


338 


129 


46.9 


31.3 


1.44 


.000 


.000 


MAX 


.00 


.00 


.00 


3380 


2300 


825 


219 


74 


67 


6.9 


.00 


.00 


MIN 


.00 


.00 


.00 


3.2 


279 


185 


78 


27 


9.5 


.00 


.00 


.00 


AC-FT 


.00 


.00 


.00 


48330 


41830 


20790 


7660 


2880 


1870 


88 


.00 


.00 


e Es 


itimated. 

























S2 



CARMEL RIVER BASIN 



111A3250 CARMEL RIVER NEAR CARMEL, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1962 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUS 



JUL 



AUG 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1962 



SEP 



MEAN 


.89 


10. A 


62.5 


224 


348 


316 


181 


66.5 


18.0 


3.70 


.69 


.25 


MAX 


22.3 


110 


479 


1034 


1754 


2196 


1006 


533 


130 


51.4 


13.1 


3.80 


<WY) 


1984 


1984 


1983 


1969 


1969 


1983 


1982 


1983 


1983 


1983 


1983 


1983 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1965 


1965 


1969 


1977 


1977 


1977 


1977 


1977 


1968 


1966 


1964 


1964 



1993 



17931.18 






62238.22 










49.0 






171 






101 

508 

.000 


1983 
1977 


2450 


Feb 


15 


3380 


Jan 


14 


8000 


Mar 1 1983 


.00 


Jan 


1 


.00 


Oct 




.00 


Oct 6 1962 


.00 


Jan 


1 


.00 


Oct 




.00 


Jul 9 1964 








4940 


Jan 


14 


9590 


Feb 28 1983 








12.76 


Jan 


14 


18.22 


Feb 28 1983 


35570 






123400 






73500 




132 






510 






256 




.00 






4.9 






.52 




.00 






.00 






.00 





CASMEL RIVER BASIN 
11143250 CARMEL RIVER NEAR CARMEL, CA- -Continued 
WATER-QUALITY RECORDS 



S3 



PERIOD OF RECORD. 
CHEMICAL DATA: 
SEDIMENT DATA: 



■-Water years 1954-66, 1990, December 1991 to current year. 
Water years 1954-66. 
Water years 1990, December 1991 to current year. 



PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



JAN 

08. .. 

13... 

21... 
MAR 

03... 

25... 
MAY 

11... 



TIME 



1415 
1205 



1340 



DIS- 






SEDI- 


SED. 


BED. 


SED. 


SED. 


SED. 


SED. 


CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


INST. 




SEDI- 


DIS- 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


FEET 


ATURE 


sus- 


SUS- 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 



PER 



1450 713 
1725 2690 
1600 953 



646 
198 



64 



WATER 



FENDED FENDED 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



SECOND (DEG C) (MG/L) (T/DAY) .062 Ml .125 VK .250 m .500 hW 1.00 m 2.00 m 



7.0 

11.5 
13.0 

12.0 
13.0 

15.5 



63 121 
940 6830 
431 1110 



63 
5 



110 
2.7 



0.52 



29 

35 

7 

34 
71 

72 



10 



19 



58 



96 



100 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 









DIS- 




BED 


BED 


BED 


BED 






NUMBER 


CHARGE, 




MAI. 


MAT. 


MAT. 


MAT. 






OF 


INST. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 






SAM- 


CUBIC 


TEMPER- 


DIAM. 


DIAM. 


DIAM. 


DIAM. 






PLING 


FEET 


ATURE 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE 


TIME 


POINTS 


PER 


WATER 


THAN 


THAN 


THAN 


THAN 






(COUNT) 


SECOND 


(DEG C) 


.062 m 


.125 ^*^ 


.250 1*1 


.500 m 


JAN 


















06. . . 


1345 




27 


10.0 


-- 


1 


2 


7 


06... 


1346 




27 


10.0 


— 


-- 


-- 


2 


06.. . 


1347 




27 


10.0 


-- 


-- 




7 


06... 


1348 




27 


10.0 


— 


-- 


— 


4 


06... 


1349 




27 


10.0 


— 


— 




6 


06... 


1350 




27 


10.0 


-- 


— 


-- 


5 


06... 


1351 




27 


10.0 


— 


1 




4 


06. .. 


1352 




27 


10.0 


— 


1 




1 


MAR 


















25... 


1240 




202 


13.0 


— 


— 





1 


25... 


1241 




202 


13.0 


— 


-- 


— 


2 


25... 


1242 




202 


13.0 


— 


— 




2 


25... 


1243 




202 


13.0 


— 


— 




3 


25... 


1244 




202 


13.0 


— 


— 


— 


— 


25... 


1245 




202 


13.0 


-- 


— 


— 


— 


25... 


1246 




202 


13.0 


10 


40 


83 


96 


MAY 




















1235 




64 


15.5 


— 


-- 




4 




1240 




64 


15.5 


— 


— 




3 




1243 




64 


15.5 


-- 


— 


-- 


2 




1246 




64 


15.5 


-- 


— 


-- 


2 




1250 




64 


15.5 


— 


— 




2 




1255 




64 


15.5 


— 


1 




2 




1302 




64 


15.5 


4 


20 


44 


52 




1315 




64 


15.5 


15 


60 


90 


98 



54 



CAHMEL RIVER BASIN 
11143250 CARMEL RIVER NEAR CARMEL, CA--Continued 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



JAN 
06 
06 
06 
06 
06 
06 
06 
06 

MAR 
25 
25 
25 
25 
25 
25 
25 

MA 



BED 


BED 


BED 


BED 


BED 


BED 


BED 


BED 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


1.00 t^^ 


2.00 m 


4.00 m 


8.00 hM 


16.0 ^t1 


32.0 »1 


64.0 h« 


128 rw 


32 


55 


67 


72 


82 


89 


100 


__ 


25 


69 


99 


100 


— 


-- 


— 


— 


21 


37 


52 


67 


95 


100 


— 


— 


14 


25 


34 


53 


86 


100 


-- 


— 


17 


28 


37 


48 


72 


100 


-- 


— 


14 


22 


30 


42 


69 


100 


-- 


— 


18 


36 


52 


67 


96 


100 


— 


— 


34 


86 


96 


98 


100 


-- 


— 


— 


22 


73 


95 


99 


100 











8 


16 


21 


27 


43 


91 


100 


— 


g 


15 


19 


26 


46 


72 


100 


— 


10 


22 


29 


36 


48 


87 


100 


-- 


2 


3 


5 


11 


33 


78 


100 


-- 


4 


76 


100 


-- 


-- 


-- 


-- 


-- 


98 


100 


— 


— 


— 


— 


— 


— 


20 


58 


76 


85 


96 


100 


-- 





13 


24 


32 


38 


51 


90 


100 


— 


8 


12 


15 


19 


29 


66 


100 


-- 


8 


12 


15 


21 


33 


60 


88 


100 


12 


18 


23 


32 


51 


75 


100 


-- 


7 


23 


34 


41 


55 


88 


100 


-- 


60 


98 


100 


— 


— 


-- 


-- 


— 


99 


100 


— 


— 


— 


— 


— 


— 



PARTICLE-SIZE DISTRIBUTION OF BEDLOAD. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





















TIME 


HORI- 










BAG 


TETHER 






ON BED 


ZONTAL 










MESH 


LINE 




START- 


END- 


FOR 


WIDTH 






SAM- 




SIZE 


USED 


IN 


ING 


ING 


BED 


OF 






PLING 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


DATE TIME 


METHOD , 


TYPE 


SAMPLER 


(YES= 


1) 


(2400 


(2400 


SAMPLE 


TICAL 






CODES 


(CODE) 


(^♦1) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 


JAN 






















06. . 


1245 


1000 


1150 


0.250 







1235 


1248 


30 


1.5 


06.. 


1305 


1000 


1150 


0.250 







1258 


1310 


30 


1.5 


08.. 


1550 


1000 


1100 


0.250 







1530 


1615 


20 


4.0 


08.. 


1650 


1000 


1100 


0.250 







1630 


1715 


20 


4.0 


13.. 


1600 


1000 


1100 


0.250 







-- 


-- 


10 


3.0 


13.. 


1700 


1000 


1100 


0.250 







-- 


— 


10 


3.0 


21.. 


1620 


1000 


1100 


0.250 







1615 


1628 


10 


5.0 


21. . 


1640 


1000 


1100 


0.250 







1632 


1646 


10 


5.0 


MAR 






















03. . 


1450 


1000 


1100 


0.250 







1442 


1500 


15 


3.0 


03. . 


1515 


1000 


1100 


0.250 







1505 


1517 


15 


3.0 


25.. 


1215 


1000 


1150 


0.250 







1215 


1220 


15 


3.0 


25.. 


1230 


1000 


1150 


0.250 







1225 


1237 


15 


3.0 



CARMEL RIVER BASIN 
11143250 CARMEL RIVER NEAR CARMEL, CA--Continued 



55 



PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





COMPSTD 


VER 








SAMPLE 


DIS- 




DISCH, 


SEDI- 


SED. 




SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE 




BEDLOAD 


MENT 


BEDLOAD 




IN 


IN 




OF 


ATION, 


INST. 




AV UNIT 


DIS- 


SIEVE 




X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 


DIAM. 




BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 


Z FINER 


DATE MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(TONS/ 


THAN 




(NUM) 


(NUM) 


(COUNT) 


L BANK) 


SECOND (DEG C) 


T/D/FT 


DAY) 


.250 MM 


JAN 
























06.. 


2 




21 




21 


5.00 


27 


10.0 


0.005 


0.13 


1 


06.. 


2 




21 




21 


5.00 


27 


10.0 


0.004 


0.13 


2 


08.. 


2 




16 




16 


4.00 


700 


7.0 


9.51 


698 


— 


08.. 


2 




16 




16 


4.00 


686 


7.0 


12.3 


698 


1 


13.. 


2 




21 




21 


— 


2960 


11.5 


31.7 


2260 


1 


13.. 


2 




21 




21 


-- 


2740 


11.5 


40.1 


2260 


1 


21.. 


2 




12 




12 


7.00 


948 


13.0 


45.1 


3210 


1 


21.. 


2 




12 




12 


7.00 


945 


13.0 


61.9 


3210 


1 


MAR 
03.. 


2 




21 




21 


2.00 


651 


12.0 


6.95 


616 


— 


03.. 


2 




21 




21 


2.00 


652 


12.0 


12.6 


616 


— 


25.. 


2 




18 




18 


1.00 


198 


13.0 


0.73 


61 


— 


25.. 


2 




18 




18 


1.00 


198 


13.0 


1.54 


61 


■■ 




SED. 


SED. 


SED . SED . 


SED. SED. SED. 


SED. 




BEDLOAD 


BEDLOAD 


BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD 




SIEVE 


SIEVE 


SIEVE SIEVE 


SIEVE SIEVE SIEVE SIEVE 




DIAM. 


DIAM. 


DIAM. DIAM. 


DIAM. DIAM. DIAM. DIAM. 




Z FINER 


Z FINER 


Z FINER Z FINER Z 


FINER Z FINER Z 


'INER Z 


FINER 




DATE THAN 


THAN 


THAN THAN 


THAN THAN 


rHAN 


THAN 



.500 1*1 1.00 ^f^ 2.00 mi 4.00 m 8.00 tw la.o m 32.0 vti 64. nw 



JAN 

06. . 

06.. 

08.. 

08.. 

13.. 

13.. 

21.. 

21.. 
MAR 

03. . 

03.. 

25.. 

2S.. 



57 
56 
26 

40 
16 
18 
36 
36 

29 
25 
34 
37 



94 
95 
51 
67 
32 
36 
64 
67 

71 
64 
86 
85 



100 
100 
67 
81 
42 
50 
80 
80 

87 
82 
96 
96 



80 
90 
49 
60 
87 
86 

94 
91 
98 
98 



93 
96 
62 
72 
95 
93 

98 

96 

98 

100 



100 

100 

85 

90 

100 

99 

100 

100 
100 



100 
100 



100 



S6 



SALINAS RIVER BASIN 



152540 

^ 



El Toro 



Creek 



152000 Arroyo Seco 



152500 
152300, 



152500 

A 



EXPLANATION 

Gaging station and abbreviated number 
(Complete number as given in the 
station description of report is 
11152500) 

Stream, open flume, or canal show^ing 
direction of flow 



151700 



I 



149 g00 San Antonio 



Lake San Antonio 

330,000 acre-feet 

Since 1965 



San Lorenzo 



Creek 



-L 

151300 



A 



150500 



River 



"i 4 ^00 Nacimiento 



Lake Nacimiento 

340,000 acre-feet 

Since 1957 



River A ^ ^ 
149400 

I 

5 



147^70 gg^^g pijfg Q^g^i^ 



147500 



Estrella 



1^ 
148500 



River 



A 



Diversion for San Luis Obispo municipal supply 



Santa Margarita Lake 
23,000 acre-feet 
Since 1941 



Figure 23. Diversions and storage in Salinas River basin. 



SALINAS RIVER BASIN 57 

111'.7070 SANTA RITA CREEK NEAR TEMPLETON, CA 

LCX;ATION.--Lat 35*31'26", long IZD'AS'Sii", in Asuncion Grant, San Luis Obispo County, HydroLogic Unit 18060005, 
on left bank 1.6 ml upstream from mouth and 4 mi west of Templeton. 

DRAINAGE AREA. — 18.2 mi^. 

PERIOD OF RECORD. — October 1961 to current year. 

GAGE. --Water-stage recorder. Elevation of gage is 860 ft above sea level, from topographic map. 

REMARKS. --No estimated daily discharges. Records fair. Some regulation by stockponds and small diversions by 
irrigation pumps upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 6,060 ft^/s, Jan. 19, 1969, gage height, 11.12 ft in gage 
well, 11.75 ft from floodmarks, from rating curve extended above 1,300 ft /s on basis of slope-area 
measurement of peak flow; no flow for many days in each year. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 600 ff'/s and maximum (*) 

Discharge Gage height Discharge 

Time (ft^/s) (ft) Date Time (ft^/s) 



Date 



Jan. 


7 


0215 


721 


6.17 


Jan. 


14 


0045 


*2,940 


*8.95 



Feb. 22 



Time 
2300 



Gage height 
(ft) 



1,090 



6.87 



No flow for many days . 



DISCHARGE, 



DAY 



CCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


2.3 


.00 


36 


16 


45 




36 


4.9 


1.9 


.05 


.00 


.00 


2 


.00 


.24 


.00 


48 


16 


38 




32 


4.6 


1.7 


.05 


.00 


.00 


3 


.00 


.09 


.01 


23 


14 


36 




30 


4.0 


1.6 


.04 


.00 


.00 


4 


.00 


.06 


.00 


17 


13 


33 




27 


4.0 


2.0 


.07 


.00 


.00 


5 


.00 


.06 


.00 


14 


14 


30 




17 


3.3 


5.2 


.10 


.00 


.00 


6 


.00 


.05 


.02 


60 


14 


27 




15 


3.3 


2.6 


.11 


.00 


.00 


7 


.00 


.04 


105 


386 


52 


25 




13 


3.3 


2.0 


.09 


.00 


.00 


e 


.00 


.04 


11 


131 


209 


22 




13 


2.9 


1.8 


.10 


.00 


.00 


9 


.00 


.03 


5.9 


60 


152 


20 




12 


2.7 


1.5 


.16 


.00 


.00 


10 


.00 


.02 


4.0 


277 


86 


19 




11 


2.7 


1.4 


.20 


.00 


.00 


11 


.00 


.02 


69 


87 


61 


17 




11 


2.7 


1.2 


.25 


.00 


.00 


12 


.00 


.02 


15 


154 


44 


16 




10 


2.9 


.97 


.33 


.00 


.00 


13 


.00 


.02 


8.2 


562 


37 


14 




9.6 


2.6 


.84 


.30 


.00 


.00 


14 


.00 


.02 


4.8 


724 


33 


13 




9.1 


2.5 


.67 


.26 


.00 


.00 


15 


.00 


.02 


3.4 


386 


28 


12 




8.7 


2.4 


.55 


.19 


.00 


.00 


16 


.00 


.02 


2.4 


290 


25 


11 




8.9 


2.3 


.41 


.13 


.00 


.00 


17 


.00 


.02 


5.0 


350 


24 


11 




9.4 


2.3 


.31 


.07 


.00 


.00 


18 


.00 


.02 


9.9 


215 


64 


10 




12 


2.2 


.33 


.06 


.00 


.00 


19 


.00 


.01 


4.6 


111 


63 


9. 


6 


10 


2.2 


.32 


.06 


.00 


.00 


20 


.00 


.01 


2.9 


82 


79 


9. 


1 


8.9 


2.4 


.49 


.04 


.00 


.00 


21 


.00 


.01 


2.3 


89 


64 


8. 


7 


8.6 


2.2 


.58 


.04 


.00 


.00 


22 


.00 


.01 


2.2 


114 


121 


8. 


7 


8.2 


1.9 


.56 


.03 


.00 


.00 


23 


3.5 


.01 


1.7 


68 


465 


8. 


3 


7.7 


1.9 


.27 


.03 


.00 


.00 


24 


7.7 


.01 


1.7 


51 


159 


11 




7.6 


2.1 


.17 


.03 


.00 


.00 


25 


8.7 


.00 


1.5 


41 


101 


144 




7.1 


3.4 


.14 


.02 


.00 


.00 


26 


9.7 


.00 


1.4 


36 


126 


180 




6.9 


2.9 


.13 


.02 


.00 


.00 


27 


3.3 


.00 


1.4 


31 


76 


118 




6.6 


2.6 


.16 


.01 


.00 


.00 


28 


.16 


.00 


17 


26 


58 


141 




6.3 


2.3 


.13 


.00 


.00 


.00 


29 


1.1 


.00 


140 


23 





74 




5.8 


1.9 


.10 


.00 


.00 


.00 


30 


20 


.00 


61 


20 





51 




5.7 


1.8 


.07 


.00 


.00 


.00 


31 


15 





23 


18 





40 







1.9 





.00 


.00 





TOTAL 


69.16 


3.15 


504.33 


4530 


2214 


1202. 


4 


374.1 


85.1 


30.10 


2.84 


0.00 


0.00 


MEAN 


2.23 


.10 


16.3 


146 


79.1 


38. 


8 


12.5 


2.75 


1.00 


.092 


.000 


.000 


MAX 


20 


2.3 


140 


724 


465 


180 


36 


4.9 


5.2 


.33 


.00 


.00 


MIN 


.00 


.00 


.00 


14 


13 


8, 


,3 


5.7 


1.8 


.07 


.00 


.00 


.00 


AC-FT 


137 


6.2 


1000 


8990 


4390 


2380 


742 


169 


60 


5.6 


.00 


.00 



S8 



SALINAS RIVER BASIN 



11147070 SANTA RITA CREEK NEAR TEMPLETON, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1962 - 1993. BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUM 



JUL 



AUG 



SEP 



MEAN 


.35 


3.98 


15.1 


39.6 


49.7 


37.0 


15.8 


2.94 


.67 


.13 


.026 


.029 


MAX 


4.35 


29.0 


131 


227 


207 


185 


114 


24.2 


3.72 


1.29 


.68 


.55 


(WY) 


1983 


1983 


1967 


1969 


1962 


1983 


1982 


1983 


1983 


1983 


1983 


1967 


MIN 


.000 


.000 


.000 


.000 


.000 


.22 


.10 


.015 


.000 


.000 


.000 


.000 


(WY) 


1962 


1962 


1977 


1991 


1991 


1977 


1977 


1990 


1972 


1966 


1962 


1962 



SUhHARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1962 - 1993 



3894.32 






9015.18 




10.6 






24.7 




480 


Feb 


15 


724 


Jan 14 


.00 


Jul 


9 


.00 


Oct 1 


.00 


Jul 


21 


.00 
2940 
8.95 


Oct 1 
Jan 14 
Jan 14 


7720 






17880 




19 






63 




.39 






1.9 




.00 






.00 





13.6 








52.7 






1983 


.16 






1977 


2190 


Dec 


6 


1966 


.00 


Oct 


1 


1961 


.00 


Oct 


1 


1961 


6060 


Jan 


19 


1969 


11.12 


Jan 


19 


1969 


9860 








22 








.24 








.00 









SALINAS RIVER BASIN 



59 



11147500 SALINAS RIVER AT PASO ROBLES, CA 

LOCATION. --Lat 35"37'43", long 120'41'00", in Paso de Robles Grant, San Luis Obispo County, Hydrologic Unit 
16060005, on left bank at upstream side of 13th Street Bridge in Paso Robles and 3 . 5 mi upstream from 
Huerhuero Creek . 

DRAINAGE AREA.— 390 mi^. 



PERIOD OF RECORD. 
CHEMICAL DATA: 
SEDIMENT DATA: 



--October 1939 to September 1965, October 1969 to current year. 
Water years 1963-66. 
June 1990. 



REVISED RECORDS.— WSP 981: 



1942. 



GAGE. — Water-stage recorder and crest-stage gage. Datum of gage is 670.61 ft above sea level. 
1951, nonrecording gage at same site and datum. 



Prior to June 14 , 



REMARKS. --Records fair. Low flows regulated by Santa Margarita Lake 32 mi upstream beginning in December 1941, 
usable capacity, 23,000 acre-ft. Diversion from Santa Margarita Lake for San Luis Obispo municipal supply 
amounted to 5,610 acre-ft for the current year. Small diversions for irrigation upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 18,500 ft^/s, Feb. 16, 1980, gage height, 15.99 ft, from 
rating curve extended above 11,000 ft /s; maximum gage height. 
In each year. 



18.80 ft, Jan. 14, 1993; no flow for many days 



EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of Jan. 25, 1969, reached a stage of 23.8 ft from floodmarks, 
discharge, 28,000 ft^/s. 

EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 850 ft^/s and maximum (*): 



Date 


Time 


Discharge 

(ft^/s) 


Gage height 
(ft) 


Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Jan. 7 
Jan. 14 
Feb. 8 


0945 
0445 
1300 


2,920 

*14,900 

2,310 


8.92 

*18.80 
8.32 


Feb. 23 
Mar. 25 


0900 
2400 


8,010 
2,900 


13.25 
8.90 



No flow for many days . 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


e.OO 


.00 


.00 


66 


199 


1060 


740 


63 


18 


.00 


.00 


.00 


2 


e.OO 


.00 


.00 


125 


182 


896 


647 


55 


16 


.00 


.00 


.00 


3 


e.OO 


.00 


.00 


67 


170 


793 


560 


51 


15 


.00 


.00 


.00 


4 


e.OO 


.00 


.00 


31 


160 


710 


463 


47 


14 


.00 


.00 


.00 


S 


e.OO 


.00 


.00 


25 


155 


646 


369 


45 


16 


.00 


.00 


.00 


6 


e.OO 


.00 


.00 


29 


147 


560 


325 


47 


18 


.00 


.00 


.00 


7 


e.OO 


.00 


.00 


1690 


155 


502 


308 


42 


17 


.00 


.00 


.00 


8 


e.OO 


.00 


.00 


1120 


1650 


437 


286 


40 


14 


.00 


.00 


.00 


9 


e.OO 


.00 


.00 


622 


1510 


391 


277 


36 


11 


.00 


.00 


.00 


10 


e.OO 


.00 


.00 


1160 


1250 


364 


256 


34 


10 


.00 


.00 


e.OO 


11 


e.OO 


.00 


.00 


750 


869 


346 


243 


33 


8.8 


.00 


.00 


e.OO 


12 


e.OO 


.00 


.00 


711 


747 


324 


231 


34 


8.0 


.00 


.00 


e.OO 


13 


e.OO 


.00 


.00 


2250 


609 


313 


214 


33 


6.8 


.00 


.00 


e.OO 


14 


e.OO 


.00 


.00 


7850 


529 


309 


200 


32 


5.9 


.00 


.00 


.00 


IS 


e.OO 


.00 


.00 


4500 


437 


297 


187 


32 


4.6 


.00 


.00 


.00 


16 


e.OO 


.00 


.00 


3760 


376 


271 


172 


30 


3.9 


.00 


.00 


.00 


17 


.00 


.00 


.00 


3470 


345 


256 


168 


29 


7.7 


.00 


.00 


.00 


18 


.00 


.00 


.00 


4210 


791 


250 


179 


28 


1.1 


.00 


.00 


.00 


19 


.00 


.00 


.00 


2610 


1900 


223 


165 


27 


.18 


.00 


.00 


.00 


20 


.00 


.00 


.00 


1600 


1950 


209 


145 


25 


.00 


.00 


.00 


.00 


21 


.00 


.00 


.00 


1230 


1480 


193 


133 


24 


.00 


.00 


.00 


.00 


22 


.00 


.00 


.00 


1060 


1210 


185 


125 


23 


.00 


.00 


.00 


.00 


23 


.00 


.00 


.00 


831 


5790 


176 


118 


25 


.00 


.00 


.00 


.00 


24 


.00 


.00 


.00 


704 


3670 


186 


108 


26 


.00 


.00 


.00 


.00 


25 


.00 


.00 


.00 


580 


2180 


909 


101 


25 


.00 


.00 


.00 


.00 


26 


.00 


.00 


.00 


465 


2220 


2080 


95 


24 


.00 


.00 


.00 


.00 


27 


.00 


.00 


.00 


378 


1720 


1430 


87 


24 


.00 


.00 


.00 


.00 


28 


.00 


.00 


.12 


296 


1330 


1990 


82 


24 


.00 


.00 


.00 


.00 


29 


.00 


.00 


253 


268 





1320 


76 


20 


.00 


.00 


.00 


.00 


30 


.00 


.00 


233 


251 





946 


71 


19 


.00 


.00 


.00 


.00 


31 


.00 





96 


224 





865 





18 





.00 


.00 





TOTAL 


0.00 


0.00 


582.12 


42933 


33731 


19437 


7131 


1015 


195.98 


0.00 


0.00 


0.00 


MEAN 


.000 


.000 


18.8 


1385 


1205 


627 


238 


32.7 


6.53 


.000 


.000 


.000 


MAX 


.00 


.00 


253 


7850 


5790 


2080 


740 


63 


18 


.00 


.00 


.00 


MIN 


.00 


.00 


.00 


25 


147 


176 


71 


18 


.00 


.00 


.00 


.00 


AC-FT 


.00 


.00 


1150 


85160 


66910 


38550 


14140 


2010 


389 


.00 


.00 


.00 


e Es 


timated. 

























60 



SALINAS RIVER BASIN 
11147500 SALINAS RIVER AT PASO ROBLES. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 
OCT NOV DEC JAN FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SUVMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1940 



SEP 



MEAN 


2.82 


5.28 


47.8 


207 


365 


344 


163 


22.2 


2.37 


.27 


.063 


1.01 


MAX 


117 


86.0 


581 


1409 


2026 


1978 


1980 


247 


30.5 


4.84 


1.91 


44.0 


(WY) 


1943 


1983 


1983 


1983 


1980 


1983 


1958 


1983 


1941 


1941 


1942 


1942 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1941 


1940 


1940 


1948 


1948 


1961 


1961 


1959 


1947 


1940 


1940 


1940 



1993 



29197.77 






105025.10 










79.8 






288 






95.2 
526 

.000 


1983 
1961 


4520 


Feb 


15 


7850 


Jan 


14 


11800 


Feb 18 1980 


.00 


Jan 


1 


.00 


Oct 




.00 


Nov 1 1939 


.00 


Jan 


7 


.00 


Oct 




.00 


Nov 1 1939 








14900 


Jan 


14 


18500 


Feb 16 1980 








18.80 


Jan 


14 


18.80 


Jan 14 1993 


57910 






208300 






68990 




143 






845 






144 




.00 






.00 






.00 




.00 






.00 






.00 





SALINAS RIVER BASIN 
11148500 ESTRELLA RIVER NEAR ESTRELLA, CA 



61 



LOCATION. --Lat 35*43'02", long 120*38'21", in NW 1/4 NW 1/4 sec. 36, T.25 S., R.12 E., San Luis Obispo County, 
Hydrologic Unit 18060004, on right bank 0.2 mi dovmstream from mouth of Ranchito Canyon and 1.9 mi northwest 
of Estrella. 

DRAINAGE AREA. --922 mi^, not including Carrizo Plains. 

PERIOD OF RECORD. --October 1954 to December 1992. Discharge measurements and estimated peak data only, January 
1993 to September 1993. Prior to October 1960, published as Estrella Creek near Estrella. 
SEDIMENT DATA: June 1990. 



REVISED RECORDS. ~WSP 2129: 1969, drainage area. 

GAGE. — Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 671.59 ft above sea level 
(levels by U.S. Army Corps of Engineers). 

REMARKS. — Records poor. No regulation; pumpage from wells along river for irrigation upstream from station. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 32,500 ft^/s, Feb. 24, 1969, gage height, 10.4 ft, from 
floodmarks, by slope-area measurement of peak flow; maximum gage height, 10.9 ft, Jan. 25, 1969, from 
floodmarks; no flow for several months in each year. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 300 ft^/s and maximum (*): 



Date Time 

Jan. 14 1900 
Feb. 9 0930 



Discharge 
(ft^/s) 



2,600e 
430 



Gage height 
(ft) 

4.28e 
2.75 



Date 



Feb. 23 
Mar. 26 



Time 



1830 
2000 



Discharge 
(ft^/s) 



*3,210 
614 



Gage height 
(ft) 

*4.59 
2.83 



No flow for many days . 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



CCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


.00 


e3.2 


e65 


elOO 


e.71 


.00 


.00 


.00 


.00 


2 


.00 


.00 


.00 


.00 


e3.0 


e50 


e66 


e.59 


.00 


.00 


.00 


.00 


3 


.00 


.00 


.00 


.00 


e2.9 


e41 


41 


e.49 


.00 


.00 


.00 


.00 


4 


.00 


.00 


.00 


.00 


e2.7 


e33 


25 


e.42 


.00 


.00 


.00 


.00 


5 


.00 


.00 


.00 


.00 


eS.O 


e27 


16 


e.36 


.00 


.00 


.00 


.00 


6 


.00 


.00 


.00 


.00 


elO 


e22 


13 


e.30 


.00 


.00 


.00 


.00 


7 


.00 


.00 


.00 


.00 


e21 


el9 


10 


e.25 


.00 


.00 


.00 


.00 


8 


.00 


.00 


.00 


.00 


32 


el7 


8.6 


e.20 


.00 


.00 


.00 


.00 


9 


.00 


.00 


.00 


.00 


195 


el4 


11 


e.l6 


.00 


.00 


.00 


.00 


10 


.00 


.00 


.00 


.00 


58 


el3 


11 


e.lO 


.00 


.00 


.00 


.00 


11 


.00 


.00 


.00 


.00 


21 


el2 


10 


e.05 


.00 


.00 


.00 


.00 


12 


.00 


.00 


.00 


.00 


16 


elO 


8.3 


e.Ol 


.00 


.00 


.00 


.00 


13 


.00 


.00 


.00 


22 


19 


e9.6 


6.7 


e.OO 


.00 


.00 


.00 


.00 


14 


.00 


.00 


.00 


ell70 


el3 


e8.7 


7.6 


.00 


.00 


.00 


.00 


.00 


IS 


.00 


.00 


.00 


el340 


e9.8 


e8.1 


7.4 


.00 


.00 


.00 


.00 


.00 


16 


.00 


.00 


.00 


e540 


e7.7 


e7.4 


7.6 


.00 


.00 


.00 


.00 


.00 


17 


.00 


.00 


.00 


243 


eS.O 


e7.1 


9.0 


.00 


.00 


.00 


.00 


.00 


18 


.00 


.00 


.00 


614 


e33 


e6.6 


9.2 


.00 


.00 


.00 


.00 


.00 


19 


.00 


.00 


.00 


270 


e438 


e6.1 


7.8 


.00 


.00 


.00 


.00 


.00 


20 


.00 


.00 


.00 


62 


609 


e5.7 


5.9 


.00 


.00 


.00 


.00 


.00 


21 


.00 


.00 


.00 


el3 


483 


e5.5 


5.8 


.00 


.00 


.00 


.00 


.00 


22 


.00 


.00 


.00 


ell 


218 


e5.2 


5.3 


.00 


.00 


.00 


.00 


.00 


23 


.00 


.00 


.00 


e8.8 


1910 


6.2 


5.3 


.00 


.00 


.00 


.00 


.00 


24 


.00 


.00 


.00 


e7.6 


1040 


17 


4.6 


.00 


.00 


.00 


.00 


.00 


25 


.00 


.00 


.00 


e6.6 


402 


95 


3.7 


.00 


.00 


.00 


.00 


.00 


26 


.00 


.00 


.00 


e5.8 


e200 


385 


3.1 


.00 


.00 


.00 


.00 


.00 


27 


.00 


.00 


.00 


e5.2 


el25 


411 


2.2 


.00 


.00 


.00 


.00 


.00 


28 


.00 


.00 


.00 


e4.6 


e86 


285 


el. 6 


.00 


.00 


.00 


.00 


.00 


29 


.00 


.00 


.00 


e4.2 





e386 


el.l 


.00 


.00 


.00 


.00 


.00 


30 


.00 


.00 


.00 


e3.8 





e230 


e.85 


.00 


.00 


.00 


.00 


.00 


31 


.00 





.00 


e3.5 





el60 





.00 





.00 


.00 





TOTAL 


0.00 


0.00 


0.00 


4335.10 


5969.3 


2368.2 


414.65 


3.64 


0.00 


0.00 


0.00 


0.00 


MEAN 


.000 


.000 


.000 


140 


213 


76.4 


13.8 


.12 


.000 


.000 


.000 


.000 


MAX 


.00 


.00 


.00 


1340 


1910 


411 


100 


.71 


.00 


.00 


.00 


.00 


MIN 


.00 


.00 


.00 


.00 


2.7 


5.2 


.85 


.00 


.00 


.00 


.00 


.00 


AC-FT 


.00 


.00 


.00 


8600 


11840 


4700 


822 


7.2 


.00 


.00 


.00 


.00 


e Estimated. 

























62 



SALINAS RIVER BASIN 



11148500 ESTRELLA RIVER NEAR ESTRELLA, CA--Contlnued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1955 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.041 


1.19 


13.0 


43.5 


134 


76.9 


31.1 


1.63 


.14 


.000 


.000 


.26 


MAX 


.93 


29.6 


371 


910 


1671 


1016 


670 


25.1 


2.58 


.000 


.000 


6.53 


(WY) 


1977 


1973 


1967 


1969 


1969 


1978 


1958 


1983 


1959 


1955 


1955 


1976 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1955 


1956 


1960 


1975 


1976 


1976 


1972 


1961 


1956 


1955 


1955 


1955 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1955 



1993 



4921.01 






13090.89 










13.4 






35.9 






24.5 
256 

.000 


1969 
1989 


1460 


Feb 


13 


1910 


Feb 


23 


18500 


Feb 10 1978 


.00 


Jan 


1 


.00 


Oct 


1 


.00 


Oct 1 1954 


.00 


Jan 


7 


.00 


Oct 


1 


.00 


Oct 1 1954 








3210 


Feb 


23 


32500 


Feb 24 1969 








4.59 


Feb 


23 


10.90 


Jan 25 1969 


9760 






25970 






17740 




1.8 






26 






6.8 




.00 






.00 






.00 




.00 






.00 






.00 





SALINAS RIVER BASIN 63 

11148900 NACIMIENTO RIVER BELOW SAPAQUE CREEK, NEAR BRYSON, CA 

LOCATION. --Lat 35*47'19", long 121"05'34", in SW 1/1, NE 1/4 sec. 3, T.25 S., R.8 E.. San Luis Obispo County, 
Bydrologic Unit 18060005, on left bank just downstream from Sapaque Creek and 1.4 mi south of Bryson. 

DRAINAGE AREA.--162 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. — October 1971 to current year. 

REVISED RECORDS. — WDR CA-82-2: Drainage area. 

GAGE. — Water-Stage recorder and crest-stage gage. Elevation of gage is 800 ft above sea level, from topographic 
map. 

REMARKS. — Records fair. No storage or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 57,600 ft^/s, Jan. 14, 1993, gage height, 32.14 ft, from 

rating curve extended above 7,900 ft /s on basis of slope-area measurement at 32.00 gage height; no flow for 
many days In each year. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 10,000 ff'/s and maximum (*): 

Discharge Gage height 
Time (ft^/s) (ft) 



Date Time 
Jan. 14 0215 *57,600 
No flow for many days . 



Discharge Gage height 
(ft^/s) (ft) 



Date 



*32.14 



DISCHARGE, 



DAY 



OCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


2.6 


1.6 


470 


428 


733 


202 


e54 


23 


3.8 


.26 


.00 


2 


.00 


2.0 


2.1 


610 


400 


621 


176 


e52 


22 


3.3 


.29 


.00 


3 


.00 


1.7 


5.9 


282 


376 


545 


158 


e49 


21 


2.9 


.36 


.00 


4 


.00 


1.5 


7.3 


185 


354 


493 


148 


e47 


20 


2.7 


.34 


.00 


S 


.00 


1.3 


12 


142 


403 


437 


134 


e46 


25 


2.7 


.31 


.00 


6 


.00 


1.1 


75 


720 


373 


399 


123 


e44 


28 


2.6 


.27 


.00 


7 


.00 


.81 


316 


3950 


368 


355 


115 


e43 


24 


2.6 


.21 


.00 


8 


.00 


.77 


66 


1550 


2710 


319 


110 


e41 


21 


2.4 


.16 


.00 


9 


.00 


.69 


90 


791 


1750 


e291 


el02 


639 


20 


2.0 


.11 


.00 


10 


.00 


.63 


132 


1310 


1420 


e270 


e97 


e38 


el8 


1.9 


.06 


.00 


11 


.00 


.57 


615 


599 


1160 


243 


e92 


e36 


16 


1.6 


.04 


.00 


12 


.00 


.53 


160 


668 


986 


225 


e90 


e35 


15 


1.5 


.03 


.00 


13 


.00 


.51 


88 


5610 


875 


208 


e85 


e34 


14 


1.3 


.02 


.00 


14 


.00 


.51 


63 


18900 


804 


197 


e83 


e33 


13 


1.2 


.03 


.00 


IS 


.00 


.52 


50 


6310 


737 


180 


e82 


e32 


12 


1.1 


.04 


.00 


16 


.00 


.56 


43 


4310 


685 


170 


elOO 


e31 


11 


.97 


.04 


.00 


17 


.00 


.59 


38 


4480 


705 


174 


113 


e30 


10 


.89 


.02 


.00 


18 


.00 


.65 


44 


4760 


1970 


167 


128 


30 


9.8 


.77 


.00 


.00 


19 


.00 


.60 


39 


2150 


2910 


149 


114 


29 


9.1 


.67 


.00 


.00 


20 


.00 


.63 


35 


1570 


2170 


139 


el02 


28 


9.2 


.59 


.00 


.00 


21 


.00 


.59 


32 


2230 


1460 


131 


e94 


27 


8.3 


.50 


.00 


.00 


22 


.00 


.65 


30 


2040 


1180 


122 


e87 


26 


7.9 


.50 


.00 


.00 


23 


.00 


.74 


28 


1470 


2860 


108 


e83 


25 


7.6 


.54 


.00 


.00 


24 


.00 


.84 


26 


1160 


1550 


126 


e77 


24 


7.4 


.52 


.00 


.00 


2S 


.00 


1.1 


25 


963 


1220 


344 


e73 


29 


6.9 


.50 


.00 


.00 


26 


.00 


1.4 


24 


818 


2060 


539 


e69 


33 


6.2 


.52 


.00 


.00 


27 


.00 


1.4 


23 


715 


1190 


362 


e66 


32 


5.2 


.50 


.00 


.00 


28 


.00 


1.2 


332 


634 


903 


600 


e63 


31 


4.4 


.45 


.00 


.00 


29 


.00 


1.2 


1140 


568 





362 


e59 


27 


4.2 


.45 


.00 


.00 


30 


8.0 


1.2 


680 


513 





274 


e57 


25 


4.1 


.46 


.00 


.00 


31 


2.2 





298 


467 





226 





24 





.35 


.00 




TOTAL 


10.20 


29.09 


4520.9 


70945 


34007 


9509 


3082 


1074 


403.3 


42.78 


2.59 


0.00 


MEAN 


.33 


.97 


146 


2289 


1215 


307 


103 


34.6 


13.4 


1.38 


.084 


.000 


MAX 


8.0 


2.6 


1140 


18900 


2910 


733 


202 


54 


28 


3.8 


.36 


.00 


MIN 


.00 


.51 


1.6 


142 


354 


108 


57 


24 


4.1 


.35 


.00 


.00 


AC-FT 


20 


58 


8970 


140700 


67450 


18860 


6110 


2130 


800 


85 


5.1 


.00 


e Estimated. 

























64 



SALINAS RIVER BASIN 



11148900 NACIMIENTO RIVER BELOW SAPAQUE CREEK, NEAR BRYSON. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1971 
OCT NOV DEC JAH FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SU^mARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1971 



SEP 



MEAN 


.63 


62.2 


177 


541 


682 


509 


175 


42.0 


9.48 


1.89 


.18 


.050 


MAX 


4.90 


413 


911 


2440 


2057 


2048 


1142 


318 


43.1 


11.2 


2.86 


.77 


(WY) 


1973 


1973 


1983 


1978 


1973 


1983 


1982 


1983 


1983 


1983 


1983 


1983 


MIN 


.000 


.000 


.000 


.000 


3.82 


16.0 


4.20 


1.61 


.11 


.000 


.000 


.000 


(WY) 


1972 


1978 


1991 


1991 


1991 


1977 


1977 


1990 


1977 


1972 


1972 


1972 



1993 



39710.23 




123625.86 










108 




339 






181 

623 
5.74 


1983 
1977 


5960 


Feb 12 


18900 


Jan 


14 


18900 


Jan 14 1993 


.00 


Jul 16 


.00 


Oct 


1 


.00 


Sep 16 1971 


.00 


Jul 16 


.00 


Oct 


1 


.00 


Sep 16 1971 






57600 


Jan 


14 


57600 


Jan 14 1993 






32.14 


Jan 


14 


32.14 


Jan 14 1993 


78770 




245200 






131100 




170 




796 






302 




5.4 




21 






5.8 




.00 




.00 






.00 





SALINAS RIVER BASIN 65 

lll^iSgOO NACIMIENTO RIVER BELOW SAPAQUE CREEK, NEAR BRYSON, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. — Water years 1972 to current year. Published as station 111*8800 "near Bryson" in water years 
1958-59, 1961-71. 
WATER TEMPERATURE: Water years 1972-73. 
SEDIMENT DATA: Water years 1972 to current year. 

PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: October 1971 to September 1973. 
SUSPENDED-SEDIMENT DISCHARGE: October 1971 to September 1973. 

REMARKS. --Zero bedload discharge observed for flows less than 261 ft /s during current year. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DIS- 






SEDI- 


SED. 


SED. 


SED. 


SED. 


SED. 






CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 






INST. 




SEDI- 


DIS- 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 






CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 






FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE 


TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 


THAN 


THAN 






SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.062 hW 


.125 1*1 


.250 h*1 


.500 hm 


1.00 m 


NOW 






















17... 


liiOS 


0.62 


14.0 





0.0 


— 


-- 


-- 


— 


— 


DEC 






















29... 


1455 


774 


8.5 


63 


132 


88 


92 


98 


100 


— 


JAN 






















07... 


1405 


2490 


12.0 


132 


887 


76 


83 


90 


97 


100 


MAR 






















10... 


1825 


261 


14.5 


2 


1.4 


-- 


-- 


-- 


-- 


— 


MAY 






















17... 


1510 


31 


22.0 


2 


0.17 


— 


— 


— 


— 


— 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

BED BED 

MAT . MAT . 

SIEVE SIEVE 

DIAM. DIAM. 



DATE 



TIME 





DIS- 




BED 


NUMBER 


CHARGE, 




MAT. 


OF 


INST. 




SIEVE 


SAM- 


CUBIC 


TEMPER- 


DIAM. 


PLING 


FEET 


ATURE 


Z FINE] 


POINTS 


PER 


WATER 


THAN 



Z FINER Z FINER Z FINER 



THAN 



THAN 



(COUNT) SECOND (DEG C) .062 ^t1 . 125 »1 .250 1*1 



MAY 



DATE 



MAY 



1400 




31 


22.0 


2 


8 


34 


1401 




31 


22.0 


-- 


1 


4 


1402 




31 


22.0 


-- 


1 


2 


1403 




31 


22.0 


-- 


1 


3 


1404 




31 


22.0 


— 


— 


3 


1405 




31 


22.0 


-- 


— 


2 


1406 




31 


22.0 


-- 


1 


6 


BED 


BED 


BED 


BED 


BED 


BED 


BED 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


.500 m 


1.00 m 


2.00 m 


4.00 tn 


8.00 rm 


16.0 »1 


32.0 m 


78 


98 


100 











_- 


10 


13 


16 


28 


48 


76 


100 


3 


3 


3 


7 


20 


58 


100 


5 


6 


6 


10 


22 


71 


100 


11 


24 


30 


39 


55 


86 


100 


8 


16 


26 


39 


58 


90 


100 


28 


58 


78 


93 


99 


100 


— 



66 



SALINAS RIVER BASIN 
111*8900 NACIMIENTO RIVER BELOW SAPAQUE CREEK, NEAR BRYSON, CA— Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



















TIME HORI- 










BAG TETHER 




ON BED ZONTAL 










MESH LINE START- END- 


FOR 


WIDTH 






SAM- 


SIZE USED 


IN ING 


ING 


BED 


OF 






PLING SAMPLER BEDLOAD SAMPLNG TIME TIME 


LOAD VER- 


1 


DATE 


TIME METHOD, TYPE SAMPLER (YES^ 


-1) (2400 (2400 SAMPLE TICAL 






CODES (CODE) (^W) (CODE) HOURS) HOURS (SEC) (FEET) 


DEC 




















29 




1525 ] 


LOOO 


1100 0. 


250 





1515 1530 


20 4.0 


29 




1540 1000 


1100 0. 


250 





1535 1548 


20 4.0 


JAN 




















07 




1430 1000 


1100 0. 


250 





1428 1435 


15 10.0 


07 




14A5 1000 


1100 0. 


250 





1441 1446 


15 10.0 






COMPSTD 


VER- 




SAMPLE 


DIS- 




DISCH, 


SEDI- 






SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE. 




BEDLOAD 


MENT 






IN 


IN 


OF 


ATION, 


INST. 




AV UNIT 


DIS- 






X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 






BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 




DATE 


MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(TONS/ 






(NUM) 


(NUM) 


(COUNT) 


L BANK) 


SECOND 


(DEG C) 


T/D/FT 


DAY) 




DEC 




















29. .. 


2 


20 


20 


8.00 


759 


8.5 


0.22 


22 




29. . . 


2 


20 


20 


8.00 


754 


8.5 


0.32 


22 




JAN 




















07... 


2 


10 


10 


5.00 


2380 


12.0 


3.96 


512 




07... 


2 


10 


10 


5.00 


2310 


12.0 


6.27 


512 






SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 






BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 






SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 






DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 






Z FINER 


Z FINER 


Z FINER 


X FINER 


Z FINER 


I FINER 


Z FINER 


Z FINER 




DATE 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 






.250 m 


.500 m 


1.00 r*i 


2.00 Ml 


4.00 r« 


8.00 h« 


16.0 m 


32.0 ^« 




DEC 




















29... 


1 


5 


41 


78 


94 


98 


100 


— 




29... 


1 


10 


52 


84 


97 


100 


-- 


— 




JAN 




















07... 


-- 


2 


14 


45 


70 


87 


96 


100 




07... 


-- 


2 


17 


57 


81 


92 


98 


100 



SALINAS RIVER BASIN 67 

11149400 NACIMIENTO RIVER BELOW NACIMIENTO DAM, NEAR BRADLEY, CA 

LOCATION.— Lat 35*45'41", long 120*51'16", in NE l/A NE 1/A seel*, T.25 S., R. 10 E., San Luis Obispo County, 
Hydrologic Unit 18060005, Camp Roberts Military Reservation, on left bank 2.2 mi downstream from Nacimiento 
Dam, and 7.6 ml southwest of Bradley. 

DRAINAGE AREA. --329 mi^. 

PERIOD OF RECORD. — October 1957 to current year. 
CHEMICAL DATA: Water years 1963-66. 

REVISED RECORDS.— WDR CA-84-2: Drainage area. 

GAGE. --Water-stage recorder. Elevation of gage is 597 ft above sea level, from topographic map. 

REMARKS. --Records fair except for estimated daily discharges, which are poor. Flow regulated by Lake Nacimiento 
(formerly Nacimiento Reservoir) beginning in February 1957, usable capacity, 3A0,000 acre-ft. No diversion 
upstream from station. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 7,340 ft^/s, Feb. 25, 1969, gage height, 10.92 ft; no flow at 
times in 1958-63, 1965, 1977, 1990. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 4,420 ft^/s. Feb. 20, gage height, 9.38 ft; minimum daily, 
5.7 ft^/8, Nov. 30. 



DISCHARGE , 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


376 


342 


8.1 


11 




24 


347 


e27 


28 


399 


532 


572 


549 


2 


368 


323 


8.8 


9. 


7 


24 


90 


30 


28 


440 


531 


572 


546 


3 


369 


253 


11 


9. 





24 


31 


30 


28 


439 


526 


572 


544 


4 


369 


324 


7.7 


8. 


3 


24 


30 


31 


28 


407 


525 


570 


538 


5 


370 


324 


8.8 


8, 


5 


24 


30 


30 


30 


360 


525 


570 


534 


6 


371 


324 


11 


10 




23 


29 


31 


28 


357 


535 


573 


531 


7 


372 


324 


12 


12 




24 


30 


30 


29 


358 


563 


579 


524 


8 


374 


324 


8.5 


8. 


6 


497 


30 


30 


29 


358 


559 


576 


517 


9 


374 


324 


10 


7. 


7 


1060 


28 


30 


29 


358 


584 


575 


515 


10 


372 


323 


9.2 


12 




1120 


29 


30 


109 


372 


599 


574 


585 


11 


369 


322 


11 


6. 


9 


1090 


28 


29 


206 


409 


596 


570 


544 


12 


345 


321 


11 


9. 





1060 


28 


29 


200 


408 


592 


568 


560 


13 


211 


318 


11 


16 




1040 


30 


29 


206 


405 


588 


570 


547 


14 


367 


319 


11 


21 




1020 


26 


29 


206 


406 


587 


571 


534 


IS 


369 


319 


10 


19 




1000 


26 


29 


206 


407 


584 


568 


519 


16 


371 


251 


6.0 


10 




997 


25 


29 


206 


407 


583 


557 


501 


17 


371 


315 


8.8 


11 




1020 


25 


28 


249 


408 


592 


550 


485 


18 


372 


314 


9.2 


8. 


2 


957 


25 


28 


299 


422 


589 


588 


471 


19 


374 


313 


7.9 


13 




923 


25 


28 


299 


443 


588 


584 


444 


20 


374 


276 


9.1 


25 




2960 


25 


28 


299 


442 


559 


578 


416 


21 


352 


296 


7.9 


25 




4110 


23 


27 


308 


444 


585 


575 


397 


22 


369 


307 


8.5 


24 




3210 


20 


27 


322 


444 


583 


572 


384 


23 


366 


303 


8.8 


25 




2250 


20 


28 


323 


445 


580 


550 


370 


24 


365 


301 


8.2 


25 




3480 


23 


27 


337 


446 


576 


538 


365 


2S 


366 


284 


8.7 


25 




3940 


31 


28 


369 


446 


576 


533 


359 


26 


366 


270 


8.6 


25 




4180 


26 


28 


370 


445 


576 


529 


356 


27 


364 


198 


8.5 


25 




4160 


22 


27 


371 


444 


575 


525 


355 


28 


362 


75 


11 


24 




2720 


23 


28 


373 


466 


574 


520 


349 


29 


361 


20 


13 


24 







e23 


28 


374 


509 


574 


515 


348 


30 


359 


5.7 


10 


24 







e24 


28 


374 


534 


573 


512 


346 


31 


350 





9.3 


24 







e25 





375 





573 


521 





TOTAL 


11218 


8312.7 


292.6 


505. 


9 


42961 


1197 


861 


6638 


12628 


17682 


17327 


14033 


MEAN 


362 


277 


9.44 


16. 


3 


1534 


38.6 


28.7 


214 


421 


570 


559 


468 


MAX 


376 


342 


13 


25 


4180 


347 


31 


375 


534 


599 


588 


585 


MIN 


211 


5.7 


6.0 


6. 


9 


23 


20 


27 


28 


357 


525 


512 


346 


AC-FT 


22250 


16490 


580 


1000 


85210 


2370 


1710 


13170 


25050 


35070 


34370 


27830 


e Estimated. 



























68 



SALINAS RIVER BASIN 



11149400 NACIMIENTO RIVER BELOW NACIMIENTO DAM, NEAR BRADLEY, CA--Contlnued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1958 
OCT NOV DEC JAN FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


231 


107 


113 


228 


460 


280 


167 


225 


300 


381 


410 


3S8 


MAX 


501 


618 


1629 


1868 


2787 


3016 


1501 


1067 


581 


662 


802 


571 


(WY) 


1983 


1983 


1983 


1980 


1983 


1969 


1958 


1983 


1969 


1958 


1967 


1967 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


1.16 


2.44 


.000 


.000 


(WY) 


1958 


1958 


1958 


1962 


1962 


1961 


1961 


1961 


1990 


1990 


1961 


1961 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1958 - 1993 



62962.6 






133556.2 








172 






366 




271 

1038 
3.43 


1983 
1990 


456 


Sep 


23 


4180 


Feb 26 


6770 


Feb 26 1969 


1.4 


Aug 


2 


5.7 


Nov 30 


.00 


Oct 1 1957 


1.6 


Aug 


1 


8.2 


Dec 16 


.00 


Oct 1 1957 








4420 


Feb 20 


7340 


Feb 25 1969 








9.38 


Feb 20 


10.92 


Feb 25 1969 


124900 






265100 




196000 




378 






581 




516 




65 






337 




123 




3.0 






11 




.84 





SALINAS RIVER BASIN 69 

lll'i9900 SAN ANTONIO RIVER NEAR LOCKWOOD, CA 

LOCATION. --Lat 35*53'48", long 121*05" lii", in Los Ojitos Grant, Monterey County. Hydrologic Unit 18060005, on 
downstream side of highway bridge, 0.4 mi upstream from Tule Canyon, and 3.3 mi south of Lockwood. 

DRAINAGE AREA.--217 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. --October 1965 to current year. 

REVISED RECORDS. --WDR CA-82-2: Drainage area. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 795.00 ft above sea level. Prior to Aug. 28, 
1975, at datum 5.00 ft higher. 

REMARKS. --No estimated daily discharges. Records fair except for daily discharges less than 5.0 ft /s, which are 
poor. No regulation; some pumping upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 14,000 ft^/s, Jan. 26, 1969, gage height, 13.25 ft, current 
datum; no flow for many days in each year. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,500 ft^/s and maximum (*): 



Date 



Jan. 7 
Jan. lA 



Discharge 
Time (ft^/s) 



0900 
0815 



3,170 
*13,100 



Gage height 
(ft) 

9.53 
*12.64 



Date 
Feb. 19 



Time 
1215 



Discharge Gage height 
(ft^/s) (ft) 



2,880 



9.42 



No flow for many days . 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


114 


236 


796 


177 


62 


31 


3.6 


.00 


.00 


2 


.00 


.00 


.00 


473 


216 


723 


165 


60 


30 


3.6 


.00 


.00 


3 


.00 


.00 


.00 


233 


195 


660 


156 


57 


28 


3.9 


.00 


.00 


4 


.00 


.00 


.00 


136 


177 


601 


151 


56 


28 


3.6 


.00 


.00 


5 


.00 


.00 


.00 


91 


173 


543 


142 


54 


28 


3.2 


.00 


.00 


6 


.00 


.00 


.00 


79 


191 


494 


135 


51 


30 


3.4 


.00 


.00 


7 


.00 


.00 


.00 


1510 


166 


451 


125 


51 


30 


3.3 


.00 


.00 


8 


.00 


.00 


.00 


1010 


833 


400 


122 


49 


28 


3.2 


.00 


.00 


9 


.00 


.00 


.00 


701 


682 


363 


117 


46 


26 


2.4 


.00 


.00 


10 


.00 


.00 


.00 


693 


535 


333 


115 


44 


24 


1.7 


.00 


.00 


11 


.00 


.00 


.00 


565 


446 


310 


111 


45 


21 


1.4 


.00 


.00 


12 


.00 


.00 


.00 


491 


390 


288 


110 


47 


19 


1.3 


.00 


.00 


13 


.00 


.00 


5.6 


2520 


331 


271 


102 


47 


18 


1.2 


.00 


.00 


14 


.00 


.00 


11 


5820 


288 


250 


99 


46 


16 


1.1 


.00 


.00 


15 


.00 


.00 


10 


2700 


252 


232 


99 


44 


14 


.68 


.00 


.00 


16 


.00 


.00 


8.7 


2160 


226 


217 


94 


43 


13 


.36 


.00 


.00 


17 


.00 


.00 


7.0 


1950 


220 


213 


92 


42 


12 


.89 


.00 


.00 


18 


.00 


.00 


5.7 


2250 


928 


208 


107 


40 


11 


1.5 


.00 


.00 


19 


.00 


.00 


4.9 


1300 


2220 


196 


101 


39 


9.9 


1.2 


.00 


.00 


20 


.00 


.00 


5.2 


1010 


1930 


185 


94 


37 


9.1 


.96 


.00 


.00 


21 


.00 


.00 


5.1 


1100 


1390 


175 


89 


36 


8.5 


.77 


.00 


.00 


22 


.00 


.00 


4.8 


987 


1180 


169 


85 


35 


7.8 


.40 


.00 


.00 


23 


.00 


.00 


4.5 


843 


1750 


165 


82 


35 


7.3 


.15 


.00 


.00 


24 


.00 


.00 


4.5 


710 


1290 


170 


80 


34 


6.4 


.00 


.00 


.00 


25 


.00 


.00 


4.4 


605 


1090 


204 


77 


36 


5.9 


.00 


.00 


.00 


26 


.00 


.00 


4.1 


515 


1410 


310 


76 


38 


5.3 


.02 


.00 


.00 


27 


.00 


.00 


3.9 


442 


1070 


242 


75 


36 


4.6 


.01 


.00 


.00 


28 


.00 


.00 


9.2 


380 


913 


307 


71 


36 


4.2 


.00 


.00 


.00 


29 


.00 


.00 


294 


332 





242 


68 


34 


3.9 


.02 


.00 


.00 


30 


.00 


.00 


414 


295 





210 


63 


33 


3.6 


.02 


.00 


.00 


31 


.00 





202 


264 





190 





32 





.00 


.00 





TOTAL 


0.00 


0.00 


1008.60 


32279 


20728 


10118 


3180 


1345 


483.5 


43.88 


0.00 


0.00 


MEAN 


.000 


.000 


32.5 


1041 


740 


326 


106 


43.4 


16.1 


1.42 


.000 


.000 


MAX 


.00 


.00 


414 


5820 


2220 


796 


177 


62 


31 


3.9 


.00 


.00 


MIN 


.00 


.00 


.00 


79 


166 


165 


63 


32 


3.6 


.00 


.00 


.00 


AC-FT 


.00 


.00 


2000 


64030 


41110 


20070 


6310 


2670 


959 


87 


.00 


.00 



70 



SALINAS RIVER BASIN 



llUggOO SAM AMTONIO river near LOCKWOOD, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1966 - 1993. BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN .42 16.2 


82.4 


286 


373 


330 


130 


40.6 


11.8 


2.71 


.24 




.068 


MAX 11.7 108 


573 


1515 


1807 


1856 


637 


167 


51.9 


22.9 


6.83 




1.91 


(WY) 1984 1984 


1967 


1969 


1986 


1983 


1982 


1983 


1978 


1983 


1983 




1983 


MIN .000 .000 


.000 


.000 


.000 


.058 


.005 


.000 


.000 


.000 


.000 




.000 


(WY) 1966 1967 


1977 


1977 


1977 


1977 


1977 


1977 


1972 


1966 


1966 




1966 


SUmARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




WATER YEARS 1966 


i - 


1993 


ANNUAL TOTAL 




16870.73 






69185.98 














ANNUAL MEAN 




46.1 






190 






105 








HIGHEST ANNUAL MEAN 
















455 






1983 


LOWEST ANNUAL MEAN 
















.005 






1977 


HIGHEST DAILY MEAN 




1530 


Feb 12 




5820 


Jan 14 




8440 


Mar 


2 


1983 


LOWEST DAILY MEAN 




.00 


Jan 1 




.00 


Oct 1 




.00 


Oct 


1 


1965 


ANNUAL SEVEN-DAY MINIMUM 




.00 


Jun 13 




.00 


Oct 1 




.00 


Oct 


1 


1965 


INSTANTANEOUS PEAK FLOW 










13100 


Jan 14 




14000 


Jan 


26 


1969 


INSTANTANEOUS PEAK STAGE 










12.64 


Jan 14 




13.25 


Jan 


26 


1969 


ANNUAL RUNOFF (AC -FT) 




33460 






137200 






75940 








10 PERCENT EXCEEDS 




129 






538 






212 








50 PERCENT EXCEEDS 




.00 






6.4 






3.3 








90 PERCENT EXCEEDS 




.00 






.00 






.00 









SALINAS RIVER BASIN 

111*9900 SAN ANTONIO RIVER NEAR LOCKWOOD, CA--Continued 

WATER-QUALITY RECORDS 



71 



PERIOD OF RECORD. — Water years 1966 to current year. 
WATER TEMPERATURE: Water years 1966-73. 
SEDIMENT DATA: Water years 1966 to current year. 

PERIOD OF DAILY RECORD.— 

WATER TEMPERATURE: October 1965 to September 1973. 
SUSPENDED-SEDIMENT DISCHARGE: October 1965 to September 1973. 



PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE TIME 



DIS- 






SEDI- 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


INST. 




SEDI- 


DIS- 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


CUBIC 


TEMPER- 


MENT. 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 



SECOND (DEG C) (MG/L) (T/DAY) .062 Ml .125 ^t^ .250 ^« .500 tt^ 1.00 m 2.00 m 



DEC 


























29... 


1225 


451 


10.0 


168 


205 




34 


35 


42 


82 


98 


100 


JAN 


























07... 


1355 


1790 


11.0 


682 


3300 




22 


23 


27 


65 


85 


97 


17... 


1545 


2400 


12.5 


380 


2460 




36 


42 


56 


83 


97 


100 


FEB 


























03... 


1235 


192 


11.0 


26 


13 




23 


36 


49 


86 


100 


— 


10... 


1345 


524 


13.0 


74 


105 




19 


21 


37 


81 


97 


100 


MAR 


























17. .. 


1735 


217 


19.0 


8 


4 


7 


-- 


— 


— 


— 


— 


— 


MAY 


























18... 


1300 


39 


23.0 


3 





32 


— 


-- 


— 


— 


-- 


— 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 



NUMBER 
OF 
SAM- 
PLING 
POINTS 



DIS- 
CHARGE, 
INST. 
CUBIC 
FEET 
PER 



TEMPER- 
ATURE 
WATER 



BED 

MAT. 

SIEVE 

DIAM. 

Z FINER 

THAN 



BED 

MAT. 

SIEVE 

DIAM. 

Z FINER 

THAN 



BED 

MAT. 

SIEVE 

DIAM. 

Z FINER 

THAN 



(COUNT) SECOND (DEG C) .062 VK . 125 h*1 .250 »1 



DEC 

29.. 

29.. 

29.. 

29.. 

29.. 

29.. 

29.. 

29.. 

29.. 

29.. 
FEB 

03.. 

03.. 

03.. 

03.. 

03. . 

03.. 

03. . 

03.. 

03.. 

03.. 



1338 
1340 
1342 
1344 
1346 
1348 
1350 
1352 
1354 
1356 

1320 
1321 
1322 
1323 
1324 
1325 
1326 
1327 
1328 
1329 



453 
453 
453 
453 
453 
453 
453 
453 
453 
453 

192 
192 
192 
192 
192 
192 
192 
192 
192 
192 



10.0 
10.0 
10.0 
10.0 
10.0 
10.0 
10.0 
10.0 
10.0 
10.0 

11.0 
11.0 
11.0 
11.0 
11.0 
11.0 
11.0 
11.0 
11.0 
11.0 



72 



SALINAS RIVER BASIN 
11149900 SAN ANTONIO RIVER NEAR LOCKWOOD, CA--Continued 
PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





BED 


BED 


BED 


BED 


BED 


BED 


BED 




MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




X FINER 


I FINER 


1 FINER 


Z FINER 


Z FINER 


Z FINER 


I FINER 


DATE THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 




.500 Hi 


1.00 ^f^ 


2.00 »1 


4.00 m 


8.00 h*1 


16.0 tV 


32.0 m 


DEC 
















29. . 


7 


32 


59 


76 


87 


98 


100 


29.. 


12 


49 


78 


90 


95 


100 


— 


29.. 


5 


26 


54 


72 


84 


98 


100 


29.. 


12 


48 


76 


89 


94 


96 


100 


29.. 


IS 


45 


71 


86 


94 


97 


100 


29.. 


22 


58 


78 


88 


93 


98 


100 


29.. 


15 


51 


75 


87 


92 


98 


100 


29.. 


10 


40 


69 


85 


93 


100 


— 


29.. 


15 


68 


93 


98 


99 


100 


-- 


29. . 


19 


73 


97 


100 


— 


— 


— 


FEB 
















03. . 


10 


39 


65 


80 


88 


98 


100 


03.. 


12 


34 


57 


74 


82 


90 


100 


03. . 


11 


42 


69 


83 


90 


98 


100 


03. . 


14 


48 


75 


87 


92 


97 


100 


03. . 


14 


39 


66 


82 


90 


98 


100 


03.. 


11 


20 


28 


39 


52 


70 


100 


03.. 


7 


33 


82 


97 


100 


— 


— 


03.. 


12 


33 


63 


87 


95 


99 


100 


03.. 


15 


26 


49 


71 


83 


93 


100 


03.. 


9 


17 


29 


37 


46 


62 


100 



PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





















TIME 


HORI- 










BAG 


TETHER 






ON BED 


ZONTAL 










MESH 


LINE 




START- 


END- 


FOR 


WIDTH 






SAM- 




SIZE 


USED 


IN 


ING 


ING 


BED 


OF 






PLING 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


DATE TIME 


METHOD . 


TYPE 


SAMPLER 


(YES- 


1) 


(2400 


(2400 


SAMPLE 


TICAL 






CODES 


(CODE) 


(Ml) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 


DEC 






















29.. 


1250 


1000 


1120 


0.250 







1240 


1300 


20 


6.0 


29.. 


1315 


1000 


1120 


0.250 







1305 


1325 


20 


6.0 


JAN 






















07.. 


1450 


1000 


1140 


0.250 







1435 


1500 


10 


7.0 


07.. 


1520 


1000 


1140 


0.250 







1510 


1530 


10 


7.0 


17.. 


1640 


1000 


1140 


0.250 







1620 


1655 


20 


10.0 


FEB 






















03.. 


1300 


1000 


1150 


0.250 







1255 


1305 


10 


4.0 


03.. 


1310 


1000 


1150 


0.250 







1310 


1315 


10 


4.0 


10.. 


1405 


1000 


1150 


0.250 







1400 


1408 


15 


10.0 


10.. 


1415 


1000 


1150 


0.250 







1415 


1420 


15 


10.0 


MAR 






















17.. 


1750 


1000 


1120 


0.250 







1744 


1758 


20 


5.0 


17.. 


1805 


1000 


1120 


0.250 







1800 


1809 


20 


5.0 


MAY 






















18.. 


1305 


1000 


1120 


0.250 







1302 


1312 


30 


3.0 


18. . 


1320 


1000 


1120 


0.250 







1315 


1325 


30 


3.0 



SALINAS RIVER BASIN 
11149900 SAN ANTONIO RIVER NEAR LOCKWOOD, CA--Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD , WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



73 







COMPSTD VER 


- 




SAMPLE 


DIS- 




DISCH. 


SEDI 


SED. 






SAMPLES TICALS NUMBER 


LOC- 


:harge 




BEDLOAD 


MENT 


BEDLOAD 






IN IN 


OF 


ATION, 


INST. 




AV 


UNIT 


DIS- 


SIEVE 






X-SEC COM- SAM- 


CROSS 


CUBIC 


TEMPER- FOR COM 


CHARGE. DIAM. 






BEDLOAD POSITE PLING 


SECTION 


FEET 


ATURE POSITE 


BEDLOAD Z FINER 


DATE 


MEASMNT SAMPLE POINTS 


(FT FM 


PER 


WATER SAMPLE 


(TONS/ THAN 






(NUM) (NUM) (COUNT) L BANK) 


SECOND (DEC C) T/D/FT 


DAY) 


.250 m 


DEC 


























29 




2 


25 


25 


3.00 


453 




10.0 


2 


80 


409 


1 


29 




2 


25 


25 


3.00 


453 




10.0 


2 


65 


409 


1 


JAN 


























07 




2 


22 


22 


3.50 


1600 




11.0 


10 


5 


1640 


2 


07 




2 


22 


22 


3.50 


1530 




11.0 


10 


8 


1640 


2 


17 




1 


22 


22 


5.00 


2520 




12.5 


10 


9 


2400 


1 


FEB 


























03 




2 


21 


21 


3.00 


192 




11.0 


4 


76 


386 


1 


03 




2 


21 


21 


3.00 


192 




11.0 


4 


43 


386 


1 


10 




2 


19 


19 


5.00 


519 




13.0 


5 


77 


1200 


1 


10 




2 


19 


19 


5.00 


519 




13.0 


6 


90 


1200 


1 


MAR 


























17 




2 


23 


23 


— 


217 




19.0 


1 


30 


166 


1 


17 




2 


23 


23 


— 


217 




19.0 


1 


59 


166 




MAY 


























18 




2 


18 


18 


1.00 


39 




23.0 





57 


26 


— 


18 




2 


18 


18 


1.00 


39 




23.0 





39 


26 


-- 






SED. 


SED. 


SED. SED. 


SED. 


SED. 




SED. 


SED. 






BEDLOAD 


BEDLOAD 


BEDLOAD BEDLOAD BEDLOAD BEDLOAD 


BEDLOAD 


BEDLOAD 






SIEVE 


SIEVE 


SIEVE SIEVE 


SIEVE 


SIEVE 




SIEVE 


SIEVE 






DIAM. 


DIAM. 


DIAM. DIAM. 


DIAM. 


DIAM. 




DIAM. 


DIAM. 






Z FINER 


Z FINER 


Z FINER Z FINER Z 


FINER Z FINER 


!t FINER 


Z FINER 




DATE THAN 


THAN 


THAN THAN 


THAN 


THAN 




THAN 


THAN 






.500 ^W 


1.00 ^W 


2.00 


MM 4.00 


m 8 


.00 rw 16.0 t^ 


32.0 


tti 


64.0 t*1 




DEC 


























29.. 


20 


50 


72 


84 




89 


96 




100 









29.. 


21 


54 


75 


85 




89 


95 




100 




— 




JAN 


























07.. 


25 


54 


79 


89 




93 


98 




100 




__ 




07.. 


20 


45 


69 


81 




87 


92 




96 




100 




17.. 


14 


43 


70 


82 




89 


96 




99 




100 




FEB 


























03.. 


30 


58 


80 


89 




94 


97 




98 




100 




03.. 


14 


52 


78 


90 




95 


99 




100 








10.. 


14 


46 


72 


86 




92 


97 




100 




-- 




10.. 


27 


52 


75 


86 




92 


96 




99 




100 




MAR 


























17.. 


15 


56 


84 


95 




98 


100 




- 


- 







17.. 


12 


44 


74 


88 




94 


98 




100 









MAY 


























18.. 


6 


48 


84 


94 




98 


100 




- 


- 







18.. 


8 


49 


82 


93 




96 


97 




100 




— 



74 



SALINAS RIVER BASIN 
11150500 SALINAS RIVER NEAR BRADLEY. CA 



LOCATION. --Lat 35*55'49", long IZO'SZ-O*" , in SW l/U NW 1/4 sac. 14. T.23 S.. R.IO E.. Monterey County, Hydrologic 
Unit 18060005, on left bank 6 ml northwest of Bradley and 7 ml downstream from San Antonio River. 

DRAINAGE AREA.— 2,535 ml 2. 

PERIOD OF RECORD. --October ig^S to September 1956, October 1957 to current year. Monthly discharge only for some 
periods, published in WSP 1315-B. 
CHEMICAL DATA: Water years 1958, 1962-66, 1972-75, 1977, 1980, 1981. 
SEDIMENT DATA: Water years 1950, 1990. 

REVISED RECORDS. --WSP 1285: 1950. WDR CA-8'.-2: 1978. 

GAGE. — Water-stage recorder and crest-stage gage. Datum of gage is 442.69 ft above sea level (levels by U.S. 
Army Corps of Engineers). 

REMARKS. — No estimated dally discharges. Records fair. Flow regulated by Santa Margarita Lake beginning in 

December 1941, usable capacity, 23,000 acre-ft; Lake Nacimiento (formerly Naclmiento Reservoir) beginning In 

February 1957, usable capacity, 340,000 acre-ft; and Lake San Antonio beginning in December 1965, usable 

capacity, 330,000 acre-ft. Several small diversions upstream from station. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 117,000 ft^/s, Feb. 24, 1969, gage height, 20.34 ft, from 
floodmarks; no flow at times in 1951. 1954-55. 1957. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 23,200 ft^/s, Jan. 14, gage height, 14.42 ft; minimum daily, 
25 ft^/s, Dec. 22-27. 



DISCHARGE, 



CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


433 


404 


58 


37 


243 


2240 


1060 


121 


363 


507 


530 


545 


2 


421 


394 


48 


44 


211 


1510 


879 


117 


423 


505 


548 


534 


3 


416 


342 


44 


72 


201 


1210 


669 


113 


424 


530 


574 


515 


A 


410 


361 


39 


70 


192 


1050 


532 


112 


419 


548 


584 


496 


5 


400 


373 


36 


61 


179 


886 


422 


107 


374 


541 


582 


478 


6 


396 


373 


37 


61 


173 


773 


342 


104 


373 


525 


577 


461 


7 


391 


370 


40 


207 


174 


646 


300 


103 


379 


569 


572 


467 


8 


384 


364 


36 


1070 


1020 


563 


279 


101 


372 


591 


547 


470 


9 


379 


358 


34 


787 


2860 


485 


275 


100 


363 


596 


560 


485 


10 


370 


355 


32 


708 


2920 


432 


271 


98 


363 


638 


577 


532 


11 


357 


350 


34 


973 


2410 


395 


266 


172 


395 


634 


584 


535 


12 


352 


344 


31 


681 


2140 


366 


267 


225 


391 


615 


573 


550 


13 


254 


343 


30 


1230 


1980 


339 


262 


225 


404 


595 


574 


536 


14 


369 


343 


29 


12800 


1840 


320 


249 


228 


412 


596 


560 


522 


15 


747 


343 


29 


8010 


1760 


295 


228 


230 


421 


620 


537 


511 


16 


1020 


296 


28 


7320 


1710 


279 


209 


226 


426 


644 


533 


500 


17 


1060 


312 


28 


4180 


1730 


265 


193 


225 


423 


670 


507 


480 


18 


1060 


331 


29 


6540 


1990 


260 


184 


286 


409 


662 


511 


469 


19 


1080 


335 


27 


4040 


3690 


237 


191 


301 


421 


647 


531 


455 


20 


629 


331 


26 


2300 


5260 


213 


193 


306 


424 


620 


541 


435 


21 


765 


275 


26 


1650 


6720 


197 


183 


308 


436 


627 


550 


411 


22 


762 


313 


25 


1350 


5210 


195 


171 


330 


444 


625 


556 


396 


23 


762 


320 


25 


1170 


11300 


198 


159 


334 


450 


605 


573 


380 


24 


762 


311 


25 


922 


10300 


217 


156 


326 


444 


589 


561 


358 


25 


744 


305 


25 


764 


7580 


336 


153 


350 


435 


607 


551 


347 


26 


669 


280 


25 


623 


7110 


1960 


148 


368 


419 


616 


562 


352 


27 


568 


265 


25 


443 


6700 


2100 


142 


382 


416 


614 


560 


362 


28 


471 


173 


28 


358 


5500 


2130 


141 


380 


429 


605 


549 


377 


29 


445 


109 


35 


315 





2050 


136 


374 


469 


582 


546 


382 


30 


452 


74 


37 


288 





1510 


129 


370 


507 


550 


536 


382 


31 


416 





35 


264 





1250 





370 





533 


528 





TOTAL 


17944 


9447 


1006 


59338 


93103 


24907 


8789 


7392 


12428 


18406 


17174 


13723 


MEAN 


579 


315 


32.5 


1914 


3325 


803 


293 


238 


414 


594 


554 


457 


MAX 


1080 


404 


58 


12800 


11300 


2240 


1060 


382 


507 


670 


584 


550 


MIN 


254 


74 


25 


37 


173 


195 


129 


98 


363 


505 


507 


347 


AC-FT 


35590 


18740 


2000 


117700 


184700 


49400 


17430 


14660 


24650 


36510 


34060 


27220 



SALINAS RIVER BASIN 

11150500 SALINAS RIVER NEAR BRADLEY, CA--Continued 

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 1956, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



75 



SEP 



MEAN 


3.23 


100 


752 


1457 


685 


878 


310 


139 


21.1 


3.41 


2.03 


1.74 


MAX 


4.04 


742 


2319 


5372 


1449 


2724 


580 


249 


55.3 


6.26 


4.16 


4.46 


(HY) 


1951 


1951 


1956 


1952 


1950 


1952 


1952 


1955 


1956 


1953 


1952 


1952 


HIM 


1.64 


4.40 


11.0 


140 


238 


293 


87.4 


40.7 


7.87 


1.64 


.000 


.000 


(Wf) 


1955 


1956 


1954 


1949 


1953 


1950 


1951 


1949 


1950 


1951 


1955 


1955 



SUW1ARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1949 - 1956 



363 








945 






1952 


152 






1955 


22000 


Dec 


24 


1955 


.00 


Aug 


15 


1951 


.00 


Aug 


15 


1951 


26800 


Jan 


15 


1952 


12.35 


Jan 


15 


1952 


263100 








745 








16 








1.6 









STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1958 - 1993, BY WATER YEAR (WY) 

MAR APR MAY 



OCT 



NOV 



DEC 



JAN 



FEB 



JUN 



JUL 



AUG 



SEP 



MEAN 


273 


149 


209 


506 


1347 


912 


510 


330 


382 


462 


508 


427 


MAX 


632 


559 


2152 


4641 


8425 


6415 


5642 


1792 


641 


661 


770 


743 


(WY) 


1970 


1983 


1983 


1969 


1969 


1983 


1958 


1983 


1983 


1983 


1991 


1969 


MIN 


3.00 


5.00 


7.58 


9.26 


10.6 


16.3 


12.1 


4.50 


2.98 


.84 


.37 


1.47 


(WY) 


1962 


1962 


1991 


1991 


1991 


1990 


1990 


1961 


1990 


1990 


1990 


1990 



SU»1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1958 



1993 



115540. 


7 






283657 










316 








777 






505 
1997 
9.39 


1983 
1990 


6150 




Feb 


13 


12800 




Jan 14 


60400 


Feb 25 1969 


8. 


1 


Aug 


19 


25 




Dec 22 


.07 


Sep 9 1990 


8. 


6 


Aug 


13 


25 
23200 




Dec 21 
Jan 14 


.09 
117000 


Sep 4 1990 
Feb 24 1969 










14. 


42 


Jan 14 


20.34 


Feb 24 1969 


229200 








562600 






365800 




504 








1290 






644 




291 








412 






302 




18 








71 






19 





76 



SALINAS RIVER BASIN 
11151700 SALINAS RIVER AT SOLEDAD, CA 



LOCATION. --Lat Se'EA'^O", long 121*19'06", on boundary between San Vicente and Los Coches Grants, Monterey 

County, Hydiologlc Unit 18060005, near right bank on upstream end of pier on U.S. Highway 101, 0.9 mi south of 
Soledad, and 1 mi upstream from Arroyo Seco. 

DRAINAGE AREA.— 3,563 mi 2. 

PERIOD OF RECORD. --October 1968 to September 1978, October 1983 to current year. 
CHEMICAL DATA: Water years 1972-75, 1977. 
SEDIMENT DATA: Water years 1990. 1992. 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage is 170 ft above sea level, from topographic 

map. 

REMARKS. --Records poor. Flow regulated by Santa Margarita Lake beginning in December 19*1, usable capacity, 
23,000 acre-ft; Lake Naclmiento (formerly Nacimlento Reservoir) beginning in February 1957, usable capacity, 
340,000 acre-ft; and by Lake San Antonio beginning in December 1965, usable capacity, 330,000 acre-ft. 
Several small diversions for irrigation upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 106,000 ft^/s, Feb. 25, 1969, gage height, 23.31 ft; maximum 
gage height, 23.39 ft, Jan. 26, 1969; no flow at times in some years. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 17,600 ft^/s, Feb. 24, gage height, 16.71 ft; maximum gage height, 
16.87 ft, from highwater mark, Jan. 15; no flow for many days. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


e.OO 


82 


37 


e. 


00 


551 


4200 


1220 


115 


177 


189 


258 


206 


2 


e.OO 


79 


e9.7 


e. 


00 


516 


2180 


920 


105 


174 


199 


256 


210 


3 


e.OO 


73 


e4.0 


e3. 


2 


488 


2150 


793 


100 


173 


203 


254 


217 


4 


e.OO 


67 


e.OO 


e. 


00 


454 


1990 


715 


92 


190 


213 


250 


218 


5 


e.OO 


59 


e.OO 


e. 


00 


445 


1600 


644 


84 


204 


227 


248 


229 


6 


e.OO 


64 


e.OO 


e. 


00 


427 


1280 


582 


77 


204 


234 


244 


243 


7 


e.OO 


64 


e.OO 


ell6 




427 


1020 


519 


68 


195 


236 


246 


247 


8 


e.OO 


68 


e.OO 


91 




588 


853 


472 


61 


189 


238 


247 


237 


9 


e.OO 


73 


e.OO 


244 




1770 


777 


437 


55 


185 


240 


250 


237 


10 


e.OO 


69 


e.OO 


302 




3280 


704 


403 


51 


178 


243 


253 


236 


11 


e.OO 


69 


e.OO 


405 




3590 


641 


378 


49 


168 


251 


244 


238 


12 


e.OO 


72 


e.OO 


470 




3140 


591 


354 


49 


163 


273 


245 


250 


13 


e.OO 


72 


e.OO 


681 




2710 


558 


330 


48 


171 


284 


243 


259 


1<> 


e.OO 


73 


e.OO 


65230 




2480 


523 


308 


56 


179 


287 


239 


260 


15 


e.OO 


73 


e.OO 


ell200 




2310 


494 


288 


64 


177 


291 


241 


258 


16 


e.OO 


78 


e.OO 


elOlOO 




2160 


468 


271 


72 


173 


294 


248 


257 


17 


e45 


77 


e.OO 


e6010 




2020 


449 


256 


77 


164 


292 


250 


251 


18 


168 


64 


e.OO 


e5430 




2060 


429 


244 


83 


162 


294 


242 


252 


19 


233 


71 


e.OO 


5610 




4040 


407 


234 


84 


157 


297 


227 


252 


20 


279 


72 


e.OO 


3480 




6200 


391 


224 


92 


160 


294 


229 


254 


21 


284 


75 


e.OO 


2340 




8420 


373 


212 


102 


176 


293 


230 


244 


22 


226 


75 


e.OO 


1790 




9090 


360 


197 


108 


177 


271 


241 


234 


23 


221 


77 


e.OO 


1510 




8640 


345 


188 


114 


176 


274 


245 


221 


24 


246 


83 


e.OO 


1320 




14400 


344 


177 


124 


175 


274 


244 


216 


25 


263 


81 


e.OO 


1160 




9120 


369 


165 


132 


173 


274 


227 


206 


26 


281 


77 


e.OO 


1030 




7430 


825 


157 


137 


165 


281 


215 


201 


27 


234 


78 


e.OO 


915 




7060 


2030 


150 


144 


166 


291 


209 


202 


28 


177 


78 


e.OO 


819 




5710 


2440 


142 


153 


176 


297 


197 


192 


29 


134 


73 


e.OO 


723 







2640 


133 


156 


181 


288 


194 


185 


30 


108 


54 


e.OO 


656 







2400 


123 


162 


181 


276 


207 


178 


31 


95 





e.OO 


596 







1770 





172 





271 


213 





TOTAL 


2994.00 


2170 


50.70 


62231. 


20 


109536 


35601 


11236 


2986 


5289 


8169 


7336 


6890 


MEAN 


96.6 


72.3 


1.64 


2007 


3912 


1148 


375 


96.3 


176 


264 


237 


230 


MAX 


284 


83 


37 


11200 


14400 


4200 


1220 


172 


204 


297 


258 


260 


MIH 


.00 


54 


.00 




00 


427 


344 


123 


48 


157 


189 


194 


178 


AC-FT 


5940 


4300 


101 


123400 


217300 


70610 


22290 


5920 


10490 


16200 


14550 


13670 


e Estimated. 



























SALINAS RIVER BASIN 



77 



11151700 SALINAS RIVER AT SOLEDAD, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1969 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


170 


106 


137 


747 


1390 


924 


277 


135 


131 


137 


156 


IBS 


MAX 


488 


336 


876 


5099 


9295 


5428 


1834 


661 


456 


390 


327 


478 


(WY) 


1970 


1970 


198* 


1969 


1969 


1969 


1969 


1959 


1969 


1969 


1969 


1969 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1990 


1990 


1990 


1990 


1990 


1990 


1990 


1990 


1990 


1990 


1990 


1990 



SUmARY STATISTICS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1969 - 1993 



ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



35979.38 






254488.90 










98.3 






697 






369 
1981 

.000 


1969 
1990 


4210 


Feb 


16 


14400 


Feb 


24 


68300 


Feb 25 1969 


.00 


Jan 


1 


.00 


Oct 


1 


.00 


Mar 9 1977 


.00 


Jan 


1 


.00 


Oct 


1 


.00 


Mar 9 1977 








17600 


Feb 


24 


106000 


Feb 25 1969 








16.87 


Jan 


15 


23.39 


Jan 26 1969 


71370 






504800 






267600 




198 






1780 






452 




.00 






218 






120 




.00 






.00 






.00 





78 



SALINAS RIVER BASIN 
11152000 ARROYO SECO NEAR SOLEDAD, CA 



LOCATION. --Lat 36'16'50". long 121"19'18", in SW !/« NE 1/4 sec. 16, T.19 S.. R.6 E., Monterey County. Hydrologle 
Unit 18060005, on right bank under county road bridge, 1.5 mi downstream from Vaquero Creek, and 10 mi south 
of Soledad. 

DRAINAGE AREA. --244 mi^. 

PERIOD OF RECORD. --November 1901 to current year. Records for water year 1902 incomplete; yearly estimate 
published in WSP 1315-B. 

REVISED RECORDS. --WSP 881: 1902-9 (yearly suimiary only). WSP 1565: 1916-19, 1920-21(M), 1922, 1926-27, 
1928-30(M), 1932, 1934, 1936(M) . WSP 1715: Drainage area. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 339.20 ft above sea level. Prior to June 16, 
1929, nonrecording gage, and June 16, 1929, to Dec. 2, 1941, water-stage recorder at site 1 mi upstream at 
different datum. Dec. 3, 1941, to Sept. 30, 1959, water-stage recorder at datum 2.00 ft higher. Jan. 30 to 
Mar. 26, 1969, nonrecording gage at bridge at same datum. 

REMARKS. --Records good except for estimated daily discharges and for discharges from Jul. S to Aug. 1, which are 
poor. No regulation or large diversion upstream from station. Low flows affected by upstream gravel mining 
during suimer months . 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 28 300 ft^/s, Apr. 3, 1958, gage height, 16.40 ft, datum then 



in use, from rating curve extended above 12,000 ft /s on basis of slope-area measurement at gage height 

3, 



16.30 ft; no flow at times during several years 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 2,500 ff'/s and maximum (*) 

Discharge Gage height D: 

Date Time (ft^/s) (ft) Date Time 

Feb. 19 0815 3,850 6.50 



Gage height 
(ft) 



Jan. 


7 


0145 


5,630 


*7.33 


Jan. 


14 


0530 


*18,800 


*13.40 



No flow for many days . 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



CCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


9.7 


7.5 


449 


363 


1040 


253 


104 


61 


24 


8.9 


62.9 


2 


.00 


5.9 


8.4 


635 


332 


931 


236 


101 


60 


23 


eS.O 


62.9 


3 


.00 


4.2 


9.0 


291 


324 


836 


225 


98 


59 


23 


ee.o 


62.8 


4 


.00 


3.1 


15 


192 


309 


756 


217 


100 


59 


23 


e7.2 


e2.8 


5 


.00 


3.1 


19 


147 


336 


689 


209 


98 


73 


22 


e7.0 


62.7 


6 


.00 


2.7 


16 


188 


321 


632 


202 


95 


72 


22 


e6.3 


62.7 


7 


.00 


2.9 


270 


e3470 


e313 


585 


197 


94 


67 


21 


e6.2 


e2.6 


B 


.00 


3.5 


120 


el8e0 


el220 


545 


189 


91 


62 


20 


e6.1 


62.6 


9 


.00 


3.9 


183 


elOOO 


6908 


508 


183 


91 


58 


19 


e6.0 


62.5 


10 


.00 


4.0 


199 


e992 


e805 


474 


177 


85 


53 


24 


e5.8 


62.5 


11 


.00 


4.0 


451 


e632 


700 


446 


173 


83 


50 


23 


e5.6 


62.4 


12 


.00 


4.2 


228 


6916 


606 


421 


167 


89 


49 


21 


e5.6 


62.4 


13 


.00 


4.4 


132 


e4S90 


538 


396 


162 


88 


46 


20 


e5.3 


62.3 


14 


.00 


4.8 


94 


e7740 


490 


379 


159 


84 


43 


18 


e5.0 


62.3 


15 


.00 


5.0 


74 


e3280 


450 


360 


153 


81 


43 


19 


e4.7 


62.4 


16 


.00 


5.4 


62 


e2830 


419 


341 


152 


79 


41 


18 


e4.7 


62.4 


17 


.00 


5.5 


54 


e3100 


536 


335 


153 


77 


39 


17 


e4.4 


e2.5 


18 


.00 


5.5 


54 


e3100 


1490 


321 


222 


76 


38 


16 


e4.4 


62.5 


19 


.00 


5.7 


49 


e2060 


2940 


303 


164 


72 


37 


14 


e4.2 


62.7 


20 


.00 


6.3 


44 


el900 


2730 


290 


150 


74 


36 


13 


e4.2 


e2.7 


21 


.00 


6.6 


41 


e2310 


1880 


275 


141 


72 


35 


12 


e4.1 


e2.9 


22 


.00 


6.5 


37 


e2180 


1480 


264 


139 


70 


33 


11 


e4.0 


62.9 


23 


.00 


6.7 


35 


1610 


2000 


255 


135 


67 


32 


12 


e3.8 


e3.1 


24 


.00 


7.3 


34 


1270 


1660 


278 


133 


67 


30 


12 


e3.8 


e3.1 


25 


.00 


8.2 


32 


1030 


1410 


288 


126 


74 


29 


11 


e3.7 


e3.3 


26 


.00 


7.7 


31 


865 


1840 


345 


121 


74 


27 


10 


e3.6 


63.3 


27 


.00 


7.4 


28 


739 


1420 


304 


117 


86 


26 


10 


63.4 


63.5 


28 


.00 


7.0 


35 


639 


1200 


367 


115 


76 


23 


11 


63.3 


63.6 


29 


.00 


7.0 


1020 


550 





301 


112 


67 


25 


11 


e3.2 


63.8 


30 


.00 


7.0 


468 


475 





276 


107 


64 


24 


11 


63.0 


63.8 


31 


1.5 





222 


412 





261 





66 





10 


63.0 





TOTAL 


1.50 


165.3 


4071.9 


51452 


29020 


13802 


4989 


2543 


1330 


521 


156.5 


84.9 


MEAN 


.048 


5.51 


131 


1660 


1036 


445 


166 


82.0 


44.3 


16.8 


5.05 


2.83 


MAX 


1.5 


9.7 


1020 


7740 


2940 


1040 


253 


104 


73 


24 


8.9 


3.8 


MIN 


.00 


2.7 


7.5 


147 


309 


255 


107 


64 


23 


10 


3.0 


2.3 


AC-FT 


3.0 


328 


8080 


102100 


57560 


27380 


9900 


5040 


2640 


1030 


310 


168 


• Estimated. 

























SALINAS RIVER BASIN 



70 



11152000 ARROYO SECO NEAR SOLEDAD, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1902 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


9.30 


55.0 


168 


380 


568 


AAA 


255 


91.9 


38.3 


14.2 


5.69 


4.70 


MAX 


75.5 


650 


1161 


2A25 


2611 


23A4 


2043 


644 


185 


90.8 


54.5 


38.8 


(WY) 


1905 


1927 


1956 


1914 


1938 


1983 


1958 


1983 


1983 


1983 


1983 


1978 


MIN 


.000 


.000 


2.87 


5.95 


8.98 


18.5 


7.82 


4.14 


.66 


.000 


.000 


.000 


(WY) 


1914 


1991 


1991 


1991 


1991 


1977 


1977 


1977 


1924 


1924 


1913 


1913 



SUhWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1902 - 1993 



39525.50 






108137.10 










108 






296 






167 
709 
6.97 


1983 
1977 


3430 


Feb 


12 


7740 


Jan 


14 


16500 


Dec 23 1955 


.00 


Aug 


19 


.00 


Oct 




.00 


Aug 27 1904 


.00 


Aug 


19 


.00 


Oct 




.00 


Aug 27 1904 








18800 


Jan 


14 


28300 


Apr 3 1958 








13.40 


Jan 


14 


16.40 


Apr 3 1958 


78400 






214500 






121200 




229 






817 






353 




13 






43 






28 




.00 






2.4 






.00 





80 



SALINAS RIVER BASIN 



11152300 SALINAS RIVER NEAR CHUALAR, CA 
(National Stream Quality Accounting Network Station) 

LOCATION. --Lat 36'33'20", long 121'32'55", In Guadalupe y Llanitos de Los Correos Grant, Monterey County, 

Hydrologlc Unit 18060005, near left bank on upstream side of bridge on Chualar-Rlver Road and 2 mi southwest 
of Chualar. 

DRAINAGE AREA.— 4,042 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. --October 1976 to current year. 

REVISED RECORDS. --WDR CA-85-2: 1983-84(M). 

GAGE. — Hater-stage recorder and crest-stage gage. Datum of gage Is 68.00 ft above sea level. Prior to January 
1979, nonrecording gage at same site and datum. Prior to Aug. 19, 1991, at site 0.2 mi upstream at same 
datum. 

REMARKS. --Records fair except for estimated dally discharges, which are poor. Daily discharges prior to January 
1979 determined by discharge measurements at this site correlated to streamflow for Salinas River at Soledad 
(station 11151700) and Salinas River near Spreckels (station 11152500). Flow regulated by Santa Margarita 
Lake beginning in December 1941, usable capacity, 23,000 acre-ft; Lake Nacimlento (formerly Nacimlento 
Reservoir) beginning in February 1957, usable capacity, 340,000 acre-ft; and Lake San Antonio beginning in 
December 1965, usable capacity, 330,000 acre-ft. Large withdrawals from ground water and small surface-water 
diversions for municipal use and for irrigation upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 53,000 ft^/s. Mar. 3, 1983, gage height, 14.92 ft, from rating 
curve extended above 21,000 ft /s; no flow at times during most years. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 15,800 ft^/s, Feb. 24, gage height, 13.12 ft; no flow for many 
days. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 




00 


651 


4590 


1170 


15 


.00 




00 


49 


26 


2 


.00 


.00 


.00 




00 


581 


2980 


994 


3.6 


.00 




00 


49 


19 


3 


.00 


.00 


.00 




00 


522 


2570 


845 


.16 


.00 




00 


50 


21 


4 


.00 


.00 


.00 




00 


474 


2130 


744 


.00 


.00 


9. 





40 


24 


5 


.00 


.00 


.00 




00 


427 


1840 


657 


.00 


.00 


29 




33 


28 


6 


.00 


.00 


.00 




00 


392 


1650 


576 


.00 


e2.5 


39 




30 


35 


7 


.00 


.00 


.00 


470 




370 


1480 


501 


.00 


e20 


41 




35 


44 


8 


.00 


.00 


.00 


662 




700 


1310 


435 


.00 


e31 


38 




34 


44 


9 


.00 


.00 


.00 


591 




1330 


1170 


386 


.00 


e28 


35 




40 


40 


10 


.00 


.00 


.00 


460 




2180 


1030 


345 


.00 


e25 


33 




40 


35 


11 


.00 


.00 


.00 


426 




2460 


904 


317 


.00 


e20 


31 




36 


32 


12 


.00 


.00 


.00 


386 




2350 


804 


296 


.00 


el5 


38 




31 


39 


13 


.00 


.00 


.00 


1540 




2180 


729 


273 


.00 


elO 


56 




31 


52 


14 


.00 


.00 


.00 


5410 




2010 


663 


248 


.00 


e8.0 


60 




30 


61 


15 


.00 


.00 


.00 


9920 




1880 


603 


216 


.00 


11 


61 




26 


59 


16 


.00 


.00 


.00 


12000 




1760 


547 


193 


.00 


9.2 


60 




27 


58 


17 


.00 


.00 


.00 


9600 




1640 


504 


177 


.00 


2.6 


57 




e30 


57 


18 


.00 


.00 


.00 


8820 




1970 


467 


162 


.00 


.00 


53 




e28 


57 


19 


.00 


.00 


.00 


8460 




3880 


421 


172 


.00 


.00 


60 




e23 


59 


20 


.00 


.00 


.00 


5130 




4880 


383 


145 


.00 


.00 


69 




el8 


63 


21 


.00 


.00 


.00 


4020 




5270 


343 


126 


.00 


.00 


71 




e23 


63 


22 


.00 


.00 


.00 


3210 




5840 


316 


112 


.00 


.00 


63 




e28 


52 


23 


.00 


.00 


.00 


2470 




5690 


291 


100 


.00 


.00 


53 




e40 


43 


24 


.00 


.00 


.00 


1930 




10700 


277 


87 


.00 


.00 


56 




e48 


31 


25 


.00 


.00 


.00 


1570 




9900 


294 


72 


.00 


.00 


55 




e4e 


22 


26 


.00 


.00 


.00 


1320 




7840 


521 


60 


.00 


.00 


62 




30 


15 


27 


.00 


.00 


.00 


1160 




6820 


1020 


51 


.00 


.00 


73 




20 


14 


28 


.00 


.00 


.00 


1040 




5850 


1500 


42 


.00 


.00 


78 




15 


10 


29 


.00 


.00 


.00 


919 







1580 


32 


.00 


.00 


71 




11 


1.6 


30 


.00 


.00 


.00 


821 







1710 


23 


.00 


.00 


64 




21 


.00 


31 


.00 





.00 


727 







1420 





.00 


— 


57 




28 





TOTAL 


0.00 


0.00 


0.00 


83062. 


00 


90547 


36047 


9557 


18.76 


182.30 


1472. 


00 


990 


1104.60 


MEAN 


.000 


.000 


.000 


2679 


3234 


1163 


319 


.61 


6.08 


47 


'.5 


31.9 


36.8 


MAX 


.00 


.00 


.00 


12000 


10700 


4 590 


1170 


15 


31 




78 


50 


63 


MIN 


.00 


.00 


.00 




00 


370 


277 


23 


.00 


.00 




00 


11 


.00 


AC-FT 


.00 


.00 


.00 


164800 


179600 


71500 


18960 


37 


362 


2920 


1960 


2190 


e Estimated. 





























SALINAS RIVER BASIN 



81 



11152300 SALINAS RIVER NEAR CHUALAR, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1977 - 1993, BY WATER YEAR (WY) 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

58.6 
286 
1983 
.000 
1990 



NOV 

72.1 
A7A 
1983 
.000 
1981 



DEC 

319 
2757 
1983 
.000 
1990 



JAN 

933 
5000 
1983 
.000 
1990 



FEB 

1698 
780^ 
1983 
.000 
1989 



MAR 

1A99 
10690 
1983 
.000 
1977 



APR 

*55 
2793 
1982 
.000 
1989 



MAY 

199 
2'>18 
1983 
.000 
1990 



JUN 

66.2 
767 
1983 
.000 
1990 



SUl«ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



17219.29 
«7.0 



35A0 Feb 17 
. 00 Jan 1 
. 00 Jan 1 



3<il50 
15 



FOR 1993 WATER YEAR 



.00 
.00 



222980. 


66 






611 








12000 




Jan 


16 




00 


Oct 


1 




00 


Oct 


1 


15800 




Feb 


24 


13. 


12 


Feb 


24 


'■'.2300 








16'.0 








28 









JUL 

53.9 
462 
1983 
.000 
1990 



AUG 

60.4 
381 
1983 
.000 
1990 



WATER YEARS 1977 



SEP 

79.7 
425 
1983 
.000 
1990 

1993 



.00 



452 










2796 


000 






1983 
1990 


43500 




Mar 


3 


1983 




00 


Jetn 


27 


1977 




,00 


Feb 


3 


1977 


53000 




Mar 


3 


1983 


14. 


,92 


Mar 


3 


1983 


327200 










700 










36 


.00 









62 SALINAS RIVER BASIN 

11152300 SALINAS RIVER NEAR CHUALAR, CA- -Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1977 to current year. 
CHEMICAL DATA: Water years 1977 to current year. 
BIOLOGICAL DATA: Water years 1977-81. 
SPECIFIC CONDUCTANCE: Water years 1977-81. 
WATER TEMPERATURE: Water years 1977-81. 
SEDIMENT DATA: Water years 1977 to current year. 

PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: January 1977 to September 1981. 
WATER TEMPERATURE: January 1977 to September 1981. 

INSTRUMENTATION. --Water-quality monitor from January 1977 to September 1981. 

WATER-QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



JAN 

12., 
MAR 

09. , 
JUN 

1*. , 
JUL 

12. , 
AUG 

09. , 
SEP 

08.. 



TIME 

1415 
1315 
1320 
1415 
1215 
1245 



DIS- 
CHARGE, 

INST. 
CUBIC 

FEET 

PER 



347 

1170 

8.3 

41 

43 

46 



SPE- 
CIFIC 
CON- 
DUCT- 
ANCE 



PH 

WATER 
WHOLE 
FIELD 
(STAND- 
ARD 



460 
625 
482 
356 
350 
348 



8.1 
8.3 
8.8 
8.5 
8.5 
8.4 



TEMPER- 
ATURE 
WATER 



SECOND (US/CM) UNITS) (DEG C) 



TUR- 
BID- 
ITY 
(NTU) 



7.0 1600 

17.0 51 

28.0 23 

25.0 37 

23.5 47 

24.5 33 



BARO- 
METRIC 
PRES- 
SURE 

cm 

OF 
BG) 



752 
764 
760 
760 
762 
760 



OXYGEN . 
DIS- 
SOLVED 
(MG/L) 



12.2 

9.6 
12.4 
9.4 
9.5 
9.8 



OXYGEN, 
DIS- 
SOLVED 
(PER- 
CENT 
SATUR- 



102 
99 
159 
114 
112 
118 



COLI- 
FORM, 
FECAL, 
0.7 
UM-MF 
(COLS./ 



2400 
K16 

K70 
58 
70 



STREP- 
TOCOCCI 

FECAL, 
KF AGAR 
(COLS. 
PER 



ATION) 100 ML) 100 ML) 



7900 

K65 

K33 

140 

70 

78 



HARD- 
NESS 
TOTAL 
(MG/L 
AS 
CAC03 ) 



150 
230 
180 
150 
150 
150 



DATE 



JAN 

12. 
MAR 

09. 
JUN 

14. 
JUL 

12. 
AUG 

09. 
SEP 

08. 



HARD- 
NESS 

NONCARB CALCIUM 

DISSOLV DIS- 

FLD. AS SOLVED 

CAC03 (MG/L 

(MG/L) AS CA) 



55 
73 
57 
29 
30 
33 



35 
55 
42 
35 
35 
35 



MAGNE- 
SIUM, SODIUM, 
DIS- DIS- 
SOLVED SOLVED 
(MG/L (MG/L 



15 
22 

19 
14 
14 
15 



31 
40 
28 
16 
16 
16 



SODIUM 



AS ti3) AS NA) PERCENT 



30 
27 
25 
19 
19 
19 



SODIUM 

AD- 
SORP- 
TION 
RATIO 



1 

1 

0.9 

0.6 

0.6 

0.6 



POTAS- 
SIUM, 
DIS- 
SOLVED 
(MG/L 
AS K) 



2.0 
2.9 
2.2 
1.5 
1.6 
1.6 



BICAR- CAR- ALKA- 

BONATE BONATE LINIIY 

WATER WATER WAT DIS SULFATE 

DIS IT DIS IT TOT IT DIS- 

FIELD FIELD FIELD SOLVED 

MG/L AS MG/L AS MG/L AS (MG/L 

HC03 C03 CAC03 AS S04 ) 



118 
189 
120 
136 
129 
136 





17 
3 
6 
3 



97 99 
155 120 



126 
117 
116 
117 



90 
53 
50 
50 



CHLO- 
RIDE, 
DIS- 
SOLVED 
(MG/L 
AS CD 



23 
34 
23 
11 
10 
11 



DATE 



JAN 

12. 
MAR 

09. 
JUN 

14. 
JUL 

12. 
AUG 

09. 
SEP 

08. 



FLUO- 


SILICA, 


RIDE, 


DIS- 


DIS- 


SOLVED 


SOLVED 


(MG/L 


(MG/L 


AS 


AS F) 


SI02) 


0.20 


16 


0.20 


23 


0.20 


15 


0.20 


16 


0.20 


15 


0.20 


15 



SOLIDS, SOLIDS, 

RESIDUE SUM OF 

AT 180 CONSTI- 

DEG. C TUENTS, 

DIS- DIS- 
SOLVED SOLVED 
(MG/L) (MG/L) 



292 
392 
300 
223 
224 
213 



283 
394 
296 
217 
212 
215 



NITRO- NITRO- NITRO- NITRO- 

SOLIDS, GEN, GEN, GEN, GEN.AM- 

DIS- NITRITE N02+N03 A»10NIA MONIA + PHOS- 

SOLVED DIS- DIS- DIS- ORG/^IC PHORUS 

(TONS SOLVED SOLVED SOLVED TOTAL TOTAL 

PER (MG/L (MG/L (MG/L (MG/L (MG/L 

AC-FT) AS N) AS N) AS N) AS N) AS P) 



0.40 0.030 0.510 0.110 4.6 

0.53 0.020 0.790 <0.010 0.30 

0.41 <0.010 0.150 <0.010 0.20 

0.30 <0.010 <0.050 0.020 0.30 

0.30 <0.010 0.100 0.020 0.20 

0.29 <0.010 0.130 0.020 0.40 



PHOS- 
PHOS- PHORUS 
PHORUS ORTHO, 
DIS- DIS- 
SOLVED SOLVED 
(MG/L (MG/L 
AS P) AS P) 



6.50 0.070 

0.230 0.100 

0.060 

0.220 

0.060 <0.010 

0.110 0.050 



0.050 
0.110 
0.020 <0.010 
0.020 0.010 

0.020 
0.020 



SALINAS RIVER BASIN 
11152300 SALINAS RIVER NEAR CHUALAR, CA— Continued 
WATER-QUALITY DATA. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



83 



ALUM- 



MANGA- 



MOLYB- 



SELE- 



STRON- 



VANA- 





INUM, 


BARIUM. 


COBALT. 


IRON. 


LITHIUM 


NESE, 


DENUM, 


NICKEL, 


NIUM, 


SILVER, 


TIUM, 


DIUM, 




DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 




SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


DATE 


(UG/L 
AS AL) 


(UG/L 
AS BA) 


(UG/L 
AS CO) 


(UG/L 
AS FE) 


(UG/L 
AS LI) 


(UG/L 
AS MN) 


(UG/L 
AS MO) 


(UG/L 
AS NI) 


(UG/L 
AS SE) 


(UG/L 
AS AG) 


(UG/L 
AS SR) 


(UG/L 
AS V) 


JAN 
12... 


60 


31 


<3 


64 


14 


1 


<10 


4 


1 


<1.0 


240 


<6 


MAR 


























09... 


-- 


— 


-- 


— 


— 


— 


-- 


— 


— 


— 


— 


-- 


JUH 
14... 


<10 


33 


<3 


10 


11 


2 


<10 


2 


2 


<1.0 


300 


<6 


JUL 


























12... 


— 


— 


-- 


-- 


-- 


-- 


-- 


— 


-- 


-- 


— 


— 


AUG 
09... 


<10 


27 


<3 


15 


7 


1 


<10 


2 


1 


<1.0 


220 


<6 


SEP 
08... 


30 


28 


<3 


4 


8 


1 


<10 


1 


<1 


<1.0 


230 


<6 



CROSS-SECTIONAL ANALYSES, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



JAN 

12.. 

12.. 

12.. 

12.. 

12.. 
MAR 

09.. 

09.. 

09.. 

09.. 

09.. 



TIME 



1348 
1350 
1354 
1356 
1358 

1251 
1257 
1311 
1320 
1329 



DEPTH 


SAMPLE 




PH 


AT 


LOC- 


SPE- 


WATER 


SAMPLE 


ATION , 


CIFIC 


WHOLE 



LOC- 
ATION, 
TOTAL 



CROSS 



CON- 



SECTION DUCT- 



FIELD TEMPER- 
( STAND- ATURE 



(FT FM 



ANCE 



ARD 



1.40 


82.0 


1.70 


120 


2.10 


140 


2.40 


158 


1.55 


186 


2.70 


18.0 


0.80 


84.0 


2.40 


129 


2.40 


167 


2.40 


228 



WATER 



(FEET) L BANK) (US/CM) UNITS) (DEG C) 



460 
460 
460 
461 
461 

628 
625 
625 
625 
626 



8.1 


7.0 


8.1 


7.0 


8.1 


7.0 


8.1 


7.0 


8.1 


7.0 


8.3 


17.0 


8.3 


17.0 


8.3 


17.0 


8.3 


17.0 


8.3 


17.0 



BARO- 




OXYGEN, 




SED. 


METRIC 




DIS- 




SUSP. 


PRES- 




SOLVED 


SEDI- 


SIEVE 


SURE 


OXYGEN , 


(PER- 


MENT, 


DIAM. 


(»1 


DIS- 


CENT 


SUS- 


Z FINER 



OF 
BG) 



SOLVED SATUR- 



PENDED 



THAN 



(MG/L) ATION) (MG/L) .062 ^M 



* Instantaneous streamflow at the time of cross-sectional measurements: 



752 


12.2 


102 


5340 


100 


752 


12.2 


102 


5480 


100 


752 


12.2 


102 


5480 


100 


752 


12.2 


102 


5430 


100 


752 


12.1 


101 


5440 


100 


764 


9.8 


101 


341 


52 


764 


9.8 


101 


212 


87 


764 


9.6 


99 


409 


39 


764 


9.6 


99 


607 


26 


764 


9.6 


99 


438 


42 


Jan. 


12, 347 


ft^/s; 


Mar. 09, 


1,170 ft^/s 



PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DIS- 






SEDI- 


SED. 






CHARGE, 






MENT, 


SUSP. 






INST. 




SEDI- 


DIS- 


SIEVE 






CUBIC 


TEMPER- 


MENT. 


CHARGE, 


DIAM. 






FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


DATE 


TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 






SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.062 in 


JAN 














12. .. 


1355 


347 


7.0 


5440 


5100 


100 


MAR 














09. .. 


1310 


1170 


17.0 


402 


1270 


49 


JUN 














14... 


1315 


8.0 


28.0 


35 


0.76 


100 


JUL 














12... 


1400 


41 


25.0 


103 


11 


100 


AUG 














09.. . 


1345 


45 


25.0 


111 


13 


100 


SEP 














08. . . 


1305 


46 


24.5 


74 


9.2 


99 



84 



SALINAS RIVER BASIN 
11152500 SALINAS RIVER NEAR SFRECKELS, CA 



LOCATION. --Lat 36'37'52", long 121*A0'17", in Naclonal Grant, Monterey County, Hydrologlc Unit 18060005, on right 
bank on downstream side of bridge on Salinas-Monterey Highway, 0.8 mi upstream from El Toro Creek, 1.6 mi 
northwest of Spreckels, and 2 mi south of Salinas. 

DRAINAGE AREA. --4, 156 mi^. 



PERIOD OF RECORD. --January 1900 to August 1901, October 1929 to current year. Records for water year 1930 

incomplete; yearly estimate published in WSP 1315-B. Published as "near Salinas" 1900-01. 
CHEMICAL DATA: Water years 1952-54, 1958-70, 1972-79. Published incorrectly as station 11152300 "near 

Chualar" in 1967. 
BIOLOGICAL DATA: Water years 1975-77. 

SPECIFIC CONDUCTANCE: Water years 1975 to January 1977, daily. 
WATER TEMPERATURE: Water years 1967-79, daily. Published incorrectly as station 11152300 "near Chualar" in 

1967-69. 
SEDIMENT DATA: Water years 1950-51; 1967-79. daily; 1986, monthly; August 1990. Published incorrectly as 

station 11152300 "near Chualar" in 1967-69. 
TURBIDITY: Water year 1973. 

REVISED RECORDS. --WSP 1565: 1930. 1935, 1945. WSP 1715: 1959. WSP 1929: Drainage area. WDR CA-85-2: 1983. 

GAGE. — Water-staga recorder and crest-stage gage. Datum of gage is 20.56 ft above sea level. 1900-01, May 10 to 
July 29, 1940, nonrecording gages at site 0.3 mi downstream at different datum. July 29. 1940, to May 22, 
1969, water-stage recorder at site 0.3 ml downstream at datum 0.69 ft lower. May 23, 1969, to Jan. 13, 1970, 
nonrecording gage at same site and datum. Mar. 17, 1941, to June 30, 1961, supplementary nonrecording gages. 

REMARKS. --No estimated daily discharges. Records fair. Flow regulated by Santa Margarita Lake (formerly Salinas 
Reservoir) beginning in 1941, usable capacity, 23,000 acre-ft; Lake Nacimiento (formerly Naclmiento Reservoir) 
beginning in February 1957, usable capacity, 340,000 acre-ft; and by Lake San Antonio beginning in December 
1965. usable capacity. 330,000 acre-ft. Large withdrawals from ground water and small surface-water 
diversions for municipal use and for Irrigation of about 95,000 acres upstream from station. 



EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 83,100 
datum then in use; maximum gage height. 26.85 ft. Jan. 
no flow at times in 1929-40, many days in 1990-92. 



ft^/s, 



16, 



Feb. 26, 1969, gage height, 26.51 ft, site and 
1952, site and datum then in use, from floodmarks; 



EXTREMES FOR CURRENT YEAR. —Maximum discharge, 12,300 ft^/s. Feb. 
days . 



25. gage height. 20.21 ft; no flow for many 



DISCHARGE. 



CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 




00 


544 


6250 


1250 


.57 


.00 


.00 


.00 


.00 


2 


.00 


.00 


.00 




00 


494 


3540 


1080 


.52 


.00 


.00 


.00 


.00 


3 


.00 


.00 


.00 




00 


454 


2570 


949 


.44 


.00 


.00 


.00 


.00 


4 


.00 


.00 


.00 




00 


415 


2070 


836 


.41 


.00 


.00 


.00 


.00 


5 


.00 


.00 


.00 




00 


375 


1750 


746 


.32 


.00 


.00 


.00 


.00 


6 


.00 


.00 


.00 




00 


357 


1520 


656 


.31 


.00 


.00 


.00 


.00 


7 


.00 


.00 


.00 




00 


346 


1340 


574 


.25 


.00 


.00 


.00 


.00 


8 


.00 


.00 


.00 




00 


4 52 


1180 


496 


.23 


.00 


.00 


.00 


.00 


9 


.00 


.00 


.00 


117 




1150 


1050 


433 


.13 


.00 


.00 


.00 


.00 


10 


.00 


.00 


.00 


387 




1800 


941 


383 


.07 


.00 


.00 


.00 


.00 


11 


.00 


.00 


.00 


356 




2280 


839 


341 


.05 


.00 


.00 


.00 


.00 


12 


.00 


.00 


.00 


306 




2110 


757 


313 


.02 


.00 


.00 


.00 


.00 


13 


.00 


.00 


.00 


566 




1850 


689 


284 


.00 


.00 


.00 


.00 


.00 


14 


.00 


.00 


.00 


3010 




1680 


633 


254 


.02 


.00 


.00 


.00 


.00 


15 


.00 


.00 


.00 


6430 




1550 


580 


221 


.05 


.00 


.00 


.00 


.00 


16 


.00 


.00 


.00 


7330 




1430 


534 


191 


.05 


.00 


.00 


.00 


.00 


17 


.00 


.00 


.00 


6700 




1320 


498 


173 


.05 


.00 


.00 


.00 


.00 


18 


.00 


.00 


.00 


6080 




1470 


463 


155 


.05 


.00 


.00 


.00 


.00 


19 


.00 


.00 


.00 


5910 




2950 


428 


156 


.05 


.00 


.00 


.00 


.00 


20 


.00 


.00 


.00 


4800 




5190 


391 


142 


.05 


.00 


.00 


.00 


.00 


21 


.00 


.00 


.00 


3620 




5730 


356 


114 


.03 


.00 


.00 


.00 


.00 


22 


.00 


.00 


.00 


3050 




6730 


326 


94 


.00 


.00 


.00 


.00 


.00 


23 


.00 


.00 


.00 


2550 




6590 


301 


77 


.00 


.00 


.00 


.00 


.00 


24 


.00 


.00 


.00 


1930 




8560 


286 


63 


.00 


.00 


.00 


.00 


.00 


25 


.00 


.00 


.00 


1520 




10600 


289 


43 


.09 


.00 


.00 


.00 


.00 


26 


.00 


.00 


.00 


1220 




8520 


861 


24 


.00 


.00 


.00 


.00 


.00 


27 


.00 


.00 


.00 


1020 




8020 


1240 


10 


.00 


.00 


.00 


.00 


.00 


28 


.00 


.00 


.00 


883 




7310 


1640 


3.3 


.00 


.00 


.00 


.00 


.00 


29 


.00 


.00 


.00 


771 







1610 


1.5 


.00 


.00 


.00 


.00 


.00 


30 


.00 


.00 


.00 


680 







1700 


.77 


.00 


.00 


.00 


.00 


.00 


31 


.00 


— 


.00 


605 







1460 





.00 


— 


.00 


.00 





TOTAL 


0.00 


0.00 


0.00 


59841. 


00 


90277 


38092 


10063.57 


3.76 


0,00 


0.00 


0.00 


0.00 


MEAN 


.000 


.000 


.000 


1930 


3224 


1229 


335 


.12 


.000 


,000 


.000 


.000 


MAX 


.00 


.00 


.00 


7330 


10600 


6250 


1250 


.57 


.00 


.00 


.00 


.00 


MIN 


.00 


.00 


.00 




,00 


346 


286 


.77 


.00 


.00 


.00 


.00 


.00 


AC-FT 


.00 


.00 


.00 


118700 


179100 


75560 


19960 


7.5 


.00 


.00 


.00 


.00 



SALINAS RIVER BASIN 



85 



11152500 SALINAS RIVER NEAR SPRECKELS, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1930 - 19A0. BY WATER YEAR (WY) 
OCT NOV DEC JAN FEB MAR APR MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


3.24 


5.04 


378 


491 


3003 


1656 


520 


75.7 


7.80 


1.53 


.81 


1.82 


MAX 


12.0 


12.0 


3215 


1742 


11940 


9543 


2019 


340 


49.3 


9.00 


5.00 


6.10 


(Wf) 


1939 


1939 


1932 


1940 


1938 


1938 


1935 


1938 


1938 


1938 


1938 


1932 


MIN 


.000 


.000 


.000 


6.33 


9.23 


3.86 


.70 


.10 


.10 


.000 


.000 


.000 


(WY) 


1940 


1940 


1940 


1931 


1931 


1931 


1931 


1931 


1931 


1931 


1931 


1931 



SUNMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUM. RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1930 - 1940 



497 








1931 






1938 


2.66 






1931 


69900 


Feb 


12 


1938 


.00 


Jul 


1 


1931 


.00 


Jul 


1 


1931 


75000 


Feb 


12 


1938 


25.00 


Feb 


12 


1938 


360400 








727 








4.7 









.00 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1942 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


27.6 


34.5 


224 


857 


1314 


1168 


502 


120 


34.2 


20.0 


21.6 


32.9 


MAX 


402 


389 


2511 


5959 


9862 


12640 


6714 


2839 


767 


403 


354 


394 


(WY) 


1970 


1983 


1983 


1969 


1969 


1983 


1958 


1983 


1983 


1983 


1983 


1983 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1991 


1991 


1991 


1991 


1990 


1990 


1990 


1990 


1990 


1990 


1990 


1990 



SUW1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1942 



1993 



12872.11 






198277.33 








35.2 






543 




358 
2997 

.81 


1983 
1990 


3330 


Feb 


17 


10600 


Feb 25 


64800 


Feb 26 1969 


.00 


Jan 


1 


.00 


Oct 1 


.00 


Jan 31 1990 


.00 


Jan 


1 


.00 


Oct 1 


.00 


Jan 31 1990 








12300 


Feb 25 


83100 


Feb 26 1969 








20.21 


Feb 25 


26.51 


Feb 26 1969 


25530 






393300 




259500 




1.4 






1520 




542 




.00 






.00 




3.3 




.00 






.00 




.80 





86 



SALINAS RIVER BASIN 
111525*0 EL TORO CRZEX NEAR SPRECKELS, CA 



LOCATION. --Lat 36'35'00", long 121*42'50", in El Toro Grant, Monterey County, Hydrologic Unit 18060005, on right 
bank 0.3 mi downstream from San Benancio Gulch and 4.7 mi southwest of Spreckels. 

DRAINAGE AREA. --31. 9 mi'^. 

PERIOD OF RECORD. --October 1961 to current year. 
SEDIMENT DATA: Water years 1986, 1990. 

GAGE. --Water-stage recorder, concrete weir control since Oct. 1, 1992, and crest-stage gage. Elevation of gage 
is 210 ft above sea level, from topographic map. Prior to Sept. 16, 1983, gage was at site 700 ft upstream at 
different datum. 



REMARKS. --Records good. No regulation or diversion upstream from station except for small stock ponds. Low flow 
at times affected by Irrigation runoff from upstream golf course. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 630 ft^/s, Mar. 2, 1983, gage height, 6.10 ft, site and datum 
then in use, from rating curve extended above 93 ft /s on basis of slope-area measurement at gage height 
6.07 ft; no flow for many days in most years. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 20 ft^/s and maximum (*), from rating 
curve extended above 240 ft /s: 



Date 



Time 



Discharge 
(ft^/s) 



Gage height 
(ft) 



Date 



Time 



Discharge 
(ft^/s) 



Gage height 
(ft) 



Jan. 


10 


0145 


Jan. 


14 


0500 


Jan. 


17 


1145 



49 

»463 

438 



2.16 

*5.71 

5.52 



Feb. 8 

Feb. 19 

Feb. 26 

Mar. 26 



1330 
2345 
1000 
0945 



53 
396 
205 
227 



2.19 
5.20 
3.69 
3.87 



No flow for many days . 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


3.2 


.85 


33 


20 


.31 


.18 


.08 


.04 


.02 


2 


.00 


.00 


.00 


.23 


.66 


27 


13 


.29 


.19 


.09 


.05 


.02 


3 


.00 


.00 


.00 


.13 


.51 


21 


10 


.31 


.21 


.06 


.05 


.03 


4 


.00 


.00 


.00 


.11 


.51 


17 


8.6 


.34 


.47 


.05 


.04 


.04 


5 


.00 


.00 


.00 


.11 


.52 


14 


7.3 


e.34 


.69 


.06 


.08 


.03 


6 


.00 


.00 


.00 


2.1 


.51 


11 


6.1 


e.30 


.36 


.07 


.10 


.04 


7 


.00 


.00 


.71 


1.9 


1.2 


8.8 


5.0 


e.33 


.24 


.09 


.12 


.05 


8 


.00 


.00 


.00 


1.9 


24 


7.6 


4.2 


e.30 


.15 


.10 


.06 


.05 


9 


.00 


.00 


.00 


3.3 


21 


6.4 


3.5 


e.25 


.11 


.10 


.06 


.05 


10 


.00 


.00 


.22 


14 


9.0 


5.3 


3.0 


e.22 


.13 


.09 


.06 


.06 


11 


.00 


.00 


.90 


.77 


8.2 


4.2 


2.4 


.34 


.14 


.07 


.07 


.05 


12 


.00 


.00 


.14 


11 


6.2 


3.6 


2.1 


.27 


.10 


.07 


.07 


.03 


13 


.00 


.00 


.03 


118 


4.8 


3.9 


1.8 


.24 


.09 


.08 


.10 


.03 


14 


.00 


.00 


.02 


196 


4.1 


3.6 


1.6 


.23 


.09 


.09 


.10 


.05 


15 


.00 


.00 


.02 


72 


3.4 


2.7 


1.2 


.20 


.11 


.08 


.05 


.05 


16 


.00 


.00 


.02 


31 


3.5 


2.2 


1.1 


.20 


.11 


.10 


.06 


.08 


17 


.00 


.00 


.42 


177 


3.7 


2.9 


2.4 


.23 


.10 


.07 


.06 


.06 


18 


.00 


.00 


.06 


93 


21 


2.5 


1.4 


.21 


.10 


.06 


.08 


.06 


19 


.00 


.00 


.03 


36 


180 


2.6 


1.1 


.23 


.08 


.08 


.07 


.05 


20 


.00 


.00 


.03 


21 


189 


2.3 


.91 


.22 


.07 


.10 


.06 


.04 


21 


.00 


.00 


.04 


15 


103 


1.8 


.72 


.21 


.08 


.09 


.07 


.04 


22 


.00 


.00 


.04 


14 


56 


1.4 


.63 


.19 


.08 


.08 


.04 


.05 


23 


.00 


.00 


.04 


8.4 


49 


2.0 


.62 


.18 


.08 


.10 


.03 


.07 


24 


.00 


.00 


.04 


5.9 


58 


2.4 


.55 


.38 


.07 


.10 


.03 


.05 


25 


.00 


.00 


.03 


4.6 


71 


13 


.51 


.46 


.07 


.08 


.04 


.03 


26 


.00 


.00 


.03 


3.2 


133 


136 


.51 


.23 


.06 


.09 


.03 


.02 


27 


.00 


.00 


.03 


2.1 


75 


61 


.49 


.27 


.05 


.11 


.03 


.02 


28 


.00 


.00 


.20 


1.4 


47 


39 


.42 


.22 


.06 


.11 


.02 


.02 


29 


.00 


.00 


1.2 


1.2 





27 


.35 


.17 


.08 


.12 


.02 


.03 


30 


.00 


.00 


.22 


1.1 





21 


.33 


.21 


.08 


.12 


.03 


.03 


31 


.00 





.09 


1.1 





17 





.22 





.08 


.04 





TOTAL 


0.00 


0.00 


4.56 


840.75 


1074.66 


503.2 


101.84 


8.10 


4.43 


2.67 


1.76 


1.25 


MEAN 


.000 


.000 


.15 


27.1 


38.4 


16.2 


3.39 


.26 


.15 


.086 


.057 


.042 


MAX 


.00 


.00 


1.2 


196 


189 


136 


20 


.46 


.69 


.12 


.12 


.08 


MIN 


.00 


.00 


.00 


.11 


.51 


1.4 


.33 


.17 


.05 


.05 


.02 


.02 


AC-FT 


.00 


.00 


9.0 


1670 


2130 


998 


202 


16 


8.8 


5.3 


3.5 


2.5 


e Estimated. 

























SALINAS RIVER BASIN 



87 



lllSaSAO EL TORO CREEK NEAR SPRECKELS, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1962 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.11 


.25 


.67 


4.01 


7.34 


6.03 


2.30 


.35 


.11 


.072 


.048 


.047 


MAX 


1.52 


2.23 


7.08 


27.4 


77.8 


62.2 


14.8 


5.18 


.63 


.49 


.28 


.22 


(WY) 


1960 


1983 


1983 


1969 


1969 


1983 


1982 


1983 


1983 


1969 


1983 


1983 


MIN 


.000 


.000 


.000 


.000 


.000 


.058 


.022 


.000 


.000 


.000 


.000 


.000 


(WY) 


1965 


1989 


1990 


1991 


1991 


1966 


1990 


1966 


1966 


1965 


1962 


1964 



SU>MARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAX FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1962 - 1993 



566.23 






2543.22 




1.55 






6.97 




159 


Feb 


15 


196 


Jan 14 


.00 


Jan 


1 


.00 


Oct 1 


.00 
120 


Jul 


29 


.00 
463 
5.71 
5040 


Oct 1 
Jan 14 
Jan 14 


.58 






13 




.01 






.10 




.00 






.00 





1.75 








11.3 






1983 


.034 






1990 


390 


Mar 


2 


1983 


.00 


Oct 


1 


1961 


.00 


Oct 


6 


1961 


630 


Mar 


2 


1983 


6.10 


Mar 


2 


1983 


1270 








1.2 








.10 








.00 









88 



TEMBLADERO SLOUGH BASIN 
11152600 GABILAN CREEK NEAR SALINAS, CA 



LOCATION. --Lat 36*'.5'21", long 121"36'3*", in La Nativldad Grant, Monterey County, Hydrologic Unit 18060011, on 
left bank at downstream side of county road bridge, 0.3 mi downstream from small left-bank tributary, and 
6.2 mi northeast of Salinas. 

DRAINAGE AREA. --36. 7 mi^. 



PERIOD OF RECORD. --October 1970 to current year. 
Flood Control and Water Conservation District. 



January 1959 to September 1970 in reports of Monterey County 



REVISED RECORDS. --WDR CA- 84 -2: 1974(M), 1978(P), 1980-83(P). 



GAGE. --Water-stage recorder and crest-stage gage. 
200 ft above sea level, from topographic map. 



Concrete control since Oct. 9, 1975. Elevation of gage is 
Prior to Oct. 9, 1975, on right bank at different datum. 



REMARKS. --Records fair above 10 ft /s, poor below. Natural flow of stream affected by small diversions, storage 
reservoirs, and return flow from irrigated areas. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 898 ft^/s, Apr. 1, 1974, gage height, 11.13 ft, at datum then 
in use, from rating curve extended above 260 ft^/s on basis of slope-area measurement of peak flow; no flow 
for many days each year. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 60 ff^/s and maximum (*): 



Date 



Time 



Jan. 


10 


0015 


Jan. 


14 


0900 


Jan. 


17 


1115 



Discharge 
(ft^/s) 



65 

400 
»446 



Gage height 
(ft) 

2.63 

3.57 

*3.69 



Date 



Time 



Jan. 


21 


0445 


Feb. 


20 


0600 


Mar. 


26 


1230 



Discharge 
(ft^/s) 



85 

146 
117 



Gage height 
(ft) 

2.74 
2.93 
2.85 



No flow for many days. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR CCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


3.5 


.00 


.94 


17 


4.1 


.87 


.06 


.00 


.00 


2 


.00 


.00 


.00 


.00 


.06 


.69 


14 


3.8 


.86 


.04 


.00 


.00 


3 


.00 


.00 


.00 


.00 


.00 


1.2 


12 


4.3 


.79 


.03 


.00 


.00 


4 


.00 


.00 


.00 


.00 


.00 


1.1 


12 


4.2 


1.1 


.00 


.00 


.00 


5 


.00 


.00 


.00 


.00 


.00 


1.5 


11 


3.5 


1.4 


.00 


.00 


.00 


6 


.00 


.00 


.00 


2.7 


.00 


2.5 


9.4 


1.6 


1.3 


.00 


.00 


.00 


7 


.00 


.00 


.00 


3.1 


.00 


2.6 


8.5 


2.0 


1.0 


.00 


.00 


.00 


e 


.00 


.00 


.00 


6.9 


18 


2.9 


6.0 


1.8 


.76 


.00 


.00 


.00 


9 


.00 


.00 


.00 


5.6 


12 


3.2 


5.2 


1.4 


e.70 


.00 


.00 


.00 


10 


.00 


.00 


.20 


20 


4.9 


3.2 


7.6 


.81 


e.70 


.00 


.00 


.00 


11 


.00 


.00 


.12 


1.7 


6.8 


2.8 


5.2 


.56 


e.60 


.00 


.00 


.00 


12 


.00 


.00 


.00 


17 


6.8 


3.0 


3.4 


.73 


e.60 


.00 


.00 


.00 


13 


.00 


.00 


.00 


60 


7.4 


3.3 


3.7 


.50 


e.60 


.00 


.00 


.00 


14 


.00 


.00 


.00 


138 


7.3 


e3.5 


6.8 


.37 


e.50 


.00 


.00 


.00 


IS 


.00 


.00 


.00 


42 


6.1 


e3.6 


6.7 


.31 


e.50 


.00 


.00 


.00 


16 


.00 


.00 


.00 


16 


4.3 


e3.7 


5.7 


.25 


e.50 


.00 


.00 


.00 


17 


.00 


.00 


.00 


146 


3.3 


e3.7 


7.0 


.23 


e.40 


.00 


.00 


.00 


IB 


.00 


.00 


.00 


74 


5.2 


e3.8 


6.7 


.17 


e.40 


.00 


.00 


.00 


19 


.00 


.00 


.00 


34 


26 


e3.8 


5.8 


.17 


e.40 


.00 


.00 


.00 


20 


.00 


.00 


.00 


25 


74 


e3.9 


5.2 


.31 


e.30 


.00 


.00 


.00 


21 


.00 


.00 


.00 


38 


58 


e4.0 


6.2 


.06 


e.30 


.00 


.00 


.00 


22 


.00 


.00 


.00 


14 


30 


e4.5 


6.9 


.10 


e.20 


.00 


.00 


.00 


23 


.00 


.00 


.00 


.83 


30 


2.5 


7.0 


.07 


e.20 


.00 


.00 


.00 


24 


.02 


.00 


.00 


.24 


19 


.47 


7.0 


.82 


e.20 


.00 


.00 


.00 


23 


.00 


.00 


.00 


.16 


11 


1.9 


7.1 


7.0 


e.lO 


.00 


.00 


.00 


26 


.02 


.00 


.00 


.14 


20 


69 


6.6 


3.6 


e.lO 


.00 


.00 


.00 


27 


.00 


.00 


.00 


.12 


2.9 


38 


6.8 


2.0 


e.lO 


.00 


.00 


.00 


28 


.00 


.00 


.00 


.07 


1.7 


30 


6.3 


.85 


e.lO 


.00 


.00 


.00 


29 


.00 


.00 


.68 


.03 





23 


5.6 


.72 


.07 


.00 


.00 


.00 


30 


.00 


.00 


.02 


.01 





18 


4.8 


.85 


.05 


.00 


.00 


.00 


31 


.00 





.00 


.00 





16 





1.0 





.00 


.00 


— 


TOTAL 


0.04 


0.00 


1.02 


649.10 


354.76 


262.30 


223.2 


48.18 


15.70 


0.13 


0.00 


0.00 


MEAN 


.001 


.000 


.033 


20.9 


12.7 


8.46 


7.44 


1.55 


.52 


.004 


.000 


.000 


MAX 


.02 


.00 


.68 


146 


74 


69 


17 


7.0 


1.4 


.06 


.00 


.00 


MIN 


.00 


.00 


.00 


.00 


.00 


.47 


3.4 


.06 


.05 


.00 


.00 


.00 


AC-FT 


.08 


.00 


2.0 


1290 


704 


520 


443 


96 


31 


.3 


.00 


.00 


e Es 


;timated. 

























TEMBLADERO SLOUGH BASIN 



89 



11152600 GABILAN CREEK NEAR SALINAS, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1971 



OCT 



NOV 



DEC 



JAM 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUH 



JUL 



AUG 



SEP 



MEAN .042 .53 


2.40 


7.09 


11.8 




14.0 


8.49 


2.20 




.90 


.30 


.13 




.033 


MAX .50 6.20 


20.0 


35.1 


88.6 




124 


58.7 


23.4 




9.27 


5.14 


2.85 




.58 


(WY) 1984 1983 


1983 


1983 


1983 




1983 


1974 


1983 




1983 


1983 


1983 




1983 


MIN .000 .000 


.000 


.000 


.000 




.000 


.000 


.000 




.000 


.000 


.000 




.000 


(WY) 1971 1971 


1972 


1972 


1972 




1972 


1972 


1971 




1971 


1971 


1971 




1971 


SUMWRY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




WATER YEARS 1971 


- 


1993 


ANNUAL TOTAL 




119.49 








1554.43 
















ANNUAL MEAN 




.33 








4.26 








3.95 








HIGHEST ANNUAL MEAN 




















29.7 






1983 


LOWEST ANNUAL MEAN 




















.000 






1972 


HIGHEST DAILY MEAN 




31 


Mar 


6 




146 


Jan 


17 




298 


Apr 


2 


1974 


LOWEST DAILY MEAN 




.00 


Jan 


1 




.00 


Oct 






.00 


Oct 


1 


1970 


ANNUAL SEVEN-DAY MINIMUM 




.00 


Jan 


7 




.00 


Oct 






.00 


Oct 


1 


1970 


INSTANTANEOUS PEAK FLOW 












446 


Jan 


17 




898 


Apr 


1 


1974 


INSTANTANEOUS PEAK STAGE 












3.69 


Jan 


17 




11.13 


Apr 


1 


1974 


ANNUAL RUNOFF (AC-FT) 




237 








3080 








2870 








10 PERCENT EXCEEDS 




.00 








7.5 








7.1 








50 PERCENT EXCEEDS 
80 PERCENT EXCEEDS 




.00 
.00 








.00 
.00 








.00 
.00 









90 



PAJARO RIVER BASIN 
11156500 SAN BENITO RIVER NEAR WILLOW CREEK SCHOOL, CA 



LOCATION. --Lat 36'36'3'i", long 121'12'07", in BE l/* SE 1/4 sec. 21. T.15 S., R.7 E., San Benito County, Hydrologic 
Unit 18060002, on left bank 0.9 mi northwest of Willow Creek School, 1.3 mi downstream from Willow Creek, and 
10 ml northwest of San Benito. 

DRAINAGE AREA.— 249 mi^. 

PERIOD OF RECORD. — October 1939 to current year. Monthly discharge only for some periods, published in WSP 1315-B. 

REVISED RECORDS. --WSP 1565: 19A8(M), 1949. WSP 1315-B: Drainage area. 

GAGE. — Water-stage recorder and crest-stage gage. Datum of gage is 925.52 ft above sea level. Prior to Jan. 28, 
1948, and Nov. 11, 1955, to Sept. 30, 1965, at site 0.9 mi downstream at different datum. Jan. 28, 1948, to 
Nov. 10, 1955, and Oct. 1, 1965, to Oct. 22, 1970, at present site at datum 2.37 ft higher. 

REMARKS. --Records fair except for estimated daily discharges, which are poor. Low flow regulated by Hernandez 
Reservoir 40 mi upstream beginning in December 1961, capacity, 18,500 acre-ft. Small diversions upstream from 
station for Irrigation. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 8,210 ft^/s, Apr. 3, 1958, gage height, 8.35 ft, site and datum 
then in use, from rating curve extended above 600 ft /s on basis of slope-area measurement of peak flow; no flow 
at times . 

EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of February 1938 reached a stage of about 9.0 ft, from floodraarks at 
former site 0.9 mi downstream, referenced to datum used at that site. 



Date 



Time 



)ischai 
(ft^/s 



Discharge 
Is) 



Jan. 14 1300 
Jan. 17 62400 
Feb. 8 eiaOO 



1,660 

»2,470 

e573 



Gage height 
(ft) 

8.51 
*9.44 
e7.22 



Date 



Feb. 19 
Mar. 26 



Time 



1300 
31000 



Discharge 
(ft^/s) 



987 
556 



Minimum daily, 0.26 ff'/s, Oct. 14-16, 19, 20. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



Gage height 
(ft) 

7.77 
7.22 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUH 



JUL 



AUG 



SEP 



1 


.35 


.38 


.46 


12 


ell 


245 


el41 


35 


32 


27 


63 


63 


2 


.33 


.35 


.48 


42 


elO 


202 


el29 


40 


30 


26 


59 


60 


3 


.37 


.35 


.52 


13 


elO 


176 


ell3 


33 


31 


27 


59 


57 


4 


.36 


.35 


.49 


7.6 


e9.8 


155 


elOO 


32 


36 


28 


60 


55 


5 


.33 


.35 


.46 


11 


el2 


139 


e91 


27 


50 


27 


56 


55 


6 


.37 


.35 


1.3 


12 


elO 


125 


e83 


21 


46 


27 


56 


54 


7 


.40 


.35 


11 


72 


el6 


113 


e76 


22 


44 


28 


55 


54 


a 


.40 


.35 


7.4 


83 


e263 


95 


e70 


23 


39 


27 


56 


55 


9 


.40 


.38 


2.8 


57 


320 


88 


e65 


30 


37 


26 


56 


57 


10 


.37 


.40 


2.1 


64 


247 


83 


e60 


26 


33 


36 


54 


59 


11 


.35 


.40 


9.8 


91 


173 


76 


e56 


26 


33 


45 


56 


60 


12 


.35 


.44 


9.1 


62 


121 


69 


e53 


36 


32 


45 


59 


59 


13 


.29 


.44 


5.3 


183 


82 


65 


e50 


32 


30 


46 


58 


59 


14 


.26 


.40 


3.6 


686 


56 


64 


e47 


29 


29 


45 


60 


57 


15 


.26 


.40 


3.6 


177 


e33 


62 


e45 


29 


28 


45 


62 


59 


16 


.26 


.40 


3.4 


215 


e42 


59 


e43 


27 


28 


44 


63 


63 


17 


.27 


.40 


2.8 


e672 


e60 


62 


e41 


25 


27 


45 


62 


64 


18 


.27 


.40 


3.7 


e891 


el23 


58 


e39 


30 


27 


42 


60 


69 


19 


.26 


.41 


2.2 


e290 


ee05 


54 


e38 


36 


26 


40 


58 


66 


20 


.26 


.44 


2.3 


el66 


e749 


50 


e36 


43 


27 


42 


60 


65 


21 


.31 


.43 


2.4 


el09 


e480 


47 


e35 


45 


27 


46 


61 


62 


22 


.29 


.46 


1.9 


ees 


e300 


46 


e34 


42 


28 


47 


63 


64 


23 


.27 


.46 


1.5 


e40 


6389 


47 


e35 


39 


29 


46 


63 


64 


24 


.28 


.46 


1.5 


e29 


e416 


72 


32 


37 


28 


43 


63 


63 


25 


.28 


.46 


1.8 


e22 


e256 


162 


30 


40 


26 


43 


65 


45 


26 


.27 


.46 


1.7 


elS 


e287 


e460 


29 


36 


26 


43 


64 


37 


27 


.28 


.46 


1.6 


el6 


389 


e324 


29 


33 


26 


53 


64 


36 


28 


.28 


.46 


1.9 


el4 


309 


e261 


31 


30 


26 


62 


63 


35 


29 


.36 


.41 


51 


el3 





e226 


25 


28 


28 


64 


62 


36 


30 


.55 


.43 


42 


el2 





el93 


22 


28 


28 


65 


65 


36 


31 


.43 





9.0 


ell 





el66 





33 





64 


66 


__. 


TOTAL 


10.11 


12.23 


189.11 


4158.6 


5978.8 


4044 


1678 


993 


937 


1294 


1871 


1668 


MEAN 


.33 


.41 


6.10 


134 


214 


130 


55.9 


32.0 


31.2 


41.7 


60.4 


55.6 


MAX 


.55 


.46 


51 


891 


805 


460 


141 


45 


50 


65 


66 


69 


MIN 


.26 


.35 


.46 


7.6 


9.8 


46 


22 


21 


26 


26 


54 


35 


AC-FT 


20 


24 


375 


8250 


11860 


8020 


3330 


1970 


1860 


2570 


3710 


3310 


e Es 


timated. 

























PAJARO RIVER BASIN 



91 



11156500 SAN BENITO RIVER NEAR WILLOW CREEK SCHOOL, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 19«0 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN S.2S 4.36 


15.9 


29.2 


59.7 


69.0 


42.8 


21.1 




20.0 


14.7 


13.4 




10.1 


MAX 42.2 20.1 


181 


238 


471 


655 


532 


130 




88.5 


79.2 


71.0 




67.2 


(WY) 1974 1976 


1956 


1952 


1941 


1983 


1958 


1983 




1962 


1967 


1967 




1978 


MIN .013 .069 


.095 


.081 


.11 


.23 


.21 


.15 




.078 


.019 


.000 




.000 


(WY) 1962 1990 


1991 


1990 


1991 


1977 


1990 


1961 




1989 


1961 


1961 




1961 


SU^«ARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




WATER YEARS 1940 


- 


1993 


ANNUAL TOTAL 




6501.87 






22833.85 
















ANNUAL MEAN 




17.8 






62.6 








25.3 








HIGHEST ANNUAL MEAN 


















126 






1941 


LOWEST ANNUAL MEAN 


















.15 






1990 


HIGHEST DAILY MEAN 




333 


Feb 15 




891 


Jan 


18 




3540 


Apr 


3 


1958 


LOWEST DAILY MEAN 




.23 


Jul 9 




.26 


Oct 


14 




.00 


Sep 


19 


1947 


ANNUAL SEVEN-DAY MINIMUM 




.26 


Oct 14 




.26 


Oct 


14 




.00 


Sep 


19 


1947 


INSTANTANEOUS PEAK FLOW 










2470 


Jan 


17 




8210 


Apr 


3 


1958 


INSTANTANEOUS PEAK STAGE 










9.44 


Jan 


17 




8.35 


Apr 


3 


1958 


ANNUAL RUNOFF (AC-FT) 




12900 






45290 








18310 








10 PERCENT EXCEEDS 




51 






127 








55 








50 PERCENT EXCEEDS 




.98 






36 








3.2 








90 PERCENT EXCEEDS 




.34 






.40 








.17 









92 



PAJARO RIVER BASIN 
1H58600 SAN BENITO RIVER AT STATE HIGHWAY 156, NEAR HOLLISTER, CA 



L(XATION.--Lat 36*51'07", long IZl'aS'**", in San Justo Grant, San Benito County, Hydrologlc Unit 18060002, on 
right bank at downstream side of bridge on State Highway 156 and 1 . 6 mi west of Hollister. 

DRAINAGE AREA.--607 mi^. 

PERIOD OF RECORD. --October 1970 to current year. 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage Is 260 ft above sea level, from topographic 
map. 

REMARKS. — Records fair except for estimated daily discharges, which are poor. Low flows regulated by Hernandez 
Reservoir 73 mi upstream, capacity, 18,500 acre-ft. Some diversions upstream from station for irrigation. 
Percolation ponds are constructed upstream from station during suimer months . 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 13,900 ft^/s. Mar. 1, 1983, gage height, 11.97 ft, from rating 
curve extended above A, 100 ft /s; no flow for many days in most years. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 500 ff^/s and maximum (•): 



Date 

Jan. 15 
Jan. 17 
Feb. 09 



Time 

0530 
2100 
1100 



Discharge 
(ft^/s) 



1,590 
1,890 
1,090 



Gage height 
(ft) 

5.97 
6.30 
5.33 



Date 

Feb. 20 
Feb. 26 
Mar. 26 



Time 

1615 
1545 
0830 



Discharge 
(ft^/s) 

*1,960 

1,810 

el, 000 



Gage height 
(ft) 

*6.37 

6.21 

eS.20 



No flow for many days . 



DAY 



OCT 



DISCHARGE, 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


3.1 


5.7 


2.1 


366 


106 


e3.3 


7.6 


elO 


5.3 


8.2 


2 


.00 


.00 


3.2 


.54 


1.7 


251 


78 


e2.1 


7.3 


elO 


5.0 


9.0 


3 


.00 


.00 


3.1 


.00 


3.4 


el75 


54 


el.l 


7.6 


elO 


4.4 


9.7 


4 


.00 


.00 


2.4 


.00 


8.8 


el38 


e44 


e3.9 


9.7 


elO 


3.9 


10 


5 


.00 


.00 


.20 


.00 


6.2 


el08 


e41 


e2.4 


12 


elO 


4.1 


11 


6 


.00 


.00 


1.3 


2.0 


7.0 


e85 


e40 


e5.9 


14 


10 


4.2 


12 


7 


.00 


.00 


1.6 


4.7 


5.0 


e64 


e37 


e5.9 


11 


9.9 


4.6 


9.0 


a 


.00 


.00 


.14 


2.7 


77 


e60 


e31 


e6.3 


6.6 


10 


4.8 


.00 


9 


.00 


.41 


.00 


9.8 


639 


e44 


e28 


e6.3 


5.3 


10 


4.8 


.00 


10 


.00 


1.3 


1.3 


22 


294 


e40 


e27 


e5.6 


3.3 


10 


5.2 


.00 


11 


.00 


1.6 


2.0 


4.5 


85 


e38 


e26 


84.7 


3.2 


11 


6.4 


.01 


12 


.00 


1.7 


.53 


11 


44 


e27 


e24 


e5.6 


.00 


elO 


6.8 


.44 


13 


.00 


1.7 


.00 


41 


26 


e29 


e21 


e6.7 


.00 


10 


7.0 


2.9 


14 


.00 


1.6 


.00 


406 


14 


e29 


el7 


e7.5 


.00 


11 


8.3 


5.5 


15 


.00 


1.6 


.00 


599 


4.7 


e23 


el7 


e6.7 


.00 


10 


9.2 


5.3 


16 


.00 


1.6 


.00 


252 


3.8 


e25 


el5 


e6.3 


2.7 


10 


8.9 


5.9 


17 


.00 


1.7 


.09 


550 


14 


e20 


el5 


e6.7 


55 


9.4 


9.2 


7.2 


IS 


.00 


2.3 


.00 


1170 


23 


e28 


el4 


e6.7 


60 


8.7 


9.7 


8.5 


19 


.00 


2.6 


.00 


356 


485 


e21 


el3 


e6.7 


37 


7.7 


9.8 


9.7 


20 


.00 


2.7 


.00 


91 


1490 


el7 


ell 


e6.7 


2.6 


7.0 


9.8 


8.2 


21 


.30 


3.0 


.00 


70 


1200 


el5 


e4.1 


e6.7 


.00 


6.9 


10 


7.9 


22 


.00 


3.0 


.00 


212 


e582 


el2 


el. 3 


e7.9 


.00 


5.7 


11 


8.6 


23 


.00 


3.0 


.00 


108 


396 


el2 


e7.9 


e8.3 


.02 


5.5 


10 


8.9 


24 


.00 


3.1 


.00 


43 


631 


el2 


e7.0 


e8.3 


e9.7 


5.3 


9.2 


9.2 


2S 


.00 


3.1 


.00 


18 


451 


26 


e3.5 


e3.9 


el2 


4.4 


8.3 


9.2 


26 


.00 


3.0 


.00 


7.3 


1180 


e495 


e3.5 


el. 7 


el2 


4.2 


8.8 


9.2 


27 


.00 


2.7 


.00 


4.8 


eSOO 


541 


e6.7 


6.0 


ell 


4.3 


8.9 


5.2 


28 


.00 


2.7 


.70 


3.4 


e502 


425 


e9.7 


7.0 


ell 


4.2 


8.5 


.00 


29 


.00 


2.9 


1.7 


2.5 





334 


e9.2 


6.2 


ell 


4.2 


8.5 


.54 


30 


.49 


3.0 


1.0 


2.0 





227 


e6.7 


4.8 


ell 


4.8 


8.3 


3.6 


31 


.00 





.00 


2.3 





151 





6.3 





5.0 


8.1 





TOTAL 


0.79 


50.31 


22.36 


4011.24 


8975.7 


3838 


718.6 


174.2 


322.62 


249.2 


231.0 


184.89 


MEAN 


.025 


1.68 


.72 


129 


321 


124 


24.0 


5.62 


10.8 


8.04 


7.45 


6.16 


MAX 


.49 


3.1 


3.2 


1170 


1490 


541 


106 


8.3 


60 


11 


11 


12 


MIN 


.00 


.00 


.00 


.00 


1.7 


12 


1.3 


1.1 


.00 


4.2 


3.9 


.00 


AC -FT 


1.6 


100 


44 


7960 


17800 


7610 


1430 


346 


640 


494 


458 


367 


e Es 


tiraated. 

























PAJARO RIVER BASIN 



93 



11158600 SAN BENITO RIVER AT STATE HIGHWAY 156, NEAR HOLLISTER, CA- -Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1971 - 1993. BY WATER YEAR (WY) 



OCT 



NOV 



MEAN 


1.93 


4.60 


MAX 


8.73 


38.2 


(WY) 


1974 


1984 


MIN 


.000 


.000 


(WY) 


1973 


1975 



SU»1ARY STATISTICS 



DEC 



JAN 



FEB 



16.1 52.1 108 

154 335 613 

1984 1983 1978 

.000 .000 .000 

1977 1977 1977 

FOR 1992 CALENDAR YEAR 



MAR 



APR 



MAY 



FOR 1993 WATER YEAR 



JUN 



113 


33.9 


10.7 


6.10 


1545 


373 


184 


18.1 


1983 


1983 


1983 


1983 


.000 


.000 


.000 


.000 


1977 


1977 


1976 


1972 



JUL 



AUG 



SEP 



4.94 5.28 4.70 

18.0 18.6 16.3 

1980 1978 1973 

.000 .000 .000 

1972 1972 1972 

WATER YEARS 1971 - 1993 



ANNUAL TOTAL 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



1208.02 






18778.91 












3.30 






51.4 






29.7 
269 

.000 




1983 
1977 


200 


Feb 


13 


1490 


Feb 


20 


8860 


Mar 


1 1983 


.00 


Jan 


1 


.00 


Oct 


1 


.00 


Feb 


1 1971 


.00 


Jan 


1 


.00 


Oct 


1 


.00 


Oct 


11 1971 








1960 


Feb 


20 


13900 


Mar 


1 1983 








6.37 


Feb 


20 


11.97 


Mar 


1 1983 


2400 






37250 






21540 






8.S 






77 






24 






.00 






6.6 






.63 






.00 






.00 






.00 







94 



PAJARO RIVER BASIN 



11159000 PAJARO RIVER AT CHITTENDEN. CA 

LOCATION. — Lat 36*54'01". long 121*35'48", in Salslpuedes Grant. Santa Cruz Count/. Hydrologlc Unit 18060002, on 
left bank at downstream side of bridge on State Highway 129. . 6 mi downstream from Pescadero Creak. . 6 mi 
southeast of Chittenden, and 2.3 ml downstream from San Benito River. 
DRAINAGE AREA. --1. 186 mi^. 

PERIOD OF RECORD. --October 1939 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. Prior to October 1954, published as "near Chittenden." 
CHEMICAL DATA: Water years 1952-92. 
BIOLOGICAL DATA: Water years 1978-81. 
SPECIFIC CONDUCTANCE: Water years 1978-81, daily. 
WATER TEMPERATURE: Water years 1978-81. daily. 
SEDIMENT DATA: Water years 1978-92. 
GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 81.89 ft above sea level 



1949. nonrecording gage on former bridge 
when a water-stage recorder was in use. 



Prior to May 13, 
100 ft downstream at same datum except for periods in 1947 and 1948 



REMARKS. --Records fair except for estimated daily discharges, which are poor. Low flows regulated by Hernandez 
Reservoir, capacity. 18.500 acre-ft; Pacheco Lake, capacity. 6.140 acre-ft; Chesbro Reservoir, capacity. 
8,090 acre-ft; Uvas Reservoir, capacity, 9,950 acre-ft; and San Felipe Lake. Many diversions upstream from 
station for irrigation. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge. 24.000 ft^/s. Dec. 24, 1955, gage height, 32.46 ft, from 
rating curve extended above 8.300 ft /s on basis of slope-conveyance study; maximum gage height, 33.11 ft, 
Apr. 3, 1958; no flow at times in July and August 1948. 

EXTREMES OUTSIDE PERIOD OF RECORD. --Flood in February 1938 reached a stage of 31.3 ft, from floodmarks. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 500 ft^/s and maximum (*): 



Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Jan. 7 
Jan. 14 
Feb. 9 


1730 
0230 
1700 


1.470 

•6.630 

2.080 


12.90 
•24.85 

14.34 


Feb. 20 
Mar. 27 


1545 
1545 


4,050 
1,720 


19.65 

13.10 



Minimum dally, 0.12 ff*/s. Nov. 15. 20. 



DISCHARGE. 



CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.18 


.73 


.17 


60 


327 


1300 


486 


55 


27 


12 


10 


7.8 


2 


.16 


.95 


.17 


230 


288 


1060 


415 


51 


26 


14 


8.7 


7.5 


3 


.16 


.97 


.36 


109 


255 


871 


351 


49 


25 


13 


8.8 


8.9 


4 


.30 


.60 


.49 


42 


230 


722 


309 


46 


25 


13 


9.2 


9.6 


S 


.32 


.45 


.49 


26 


208 


618 


263 


43 


28 


12 


9.8 


8.5 


6 


.46 


.39 


.85 


21 


193 


528 


225 


41 


29 


12 


9.9 


7.6 


7 


.50 


.23 


2.1 


787 


180 


456 


198 


41 


30 


11 


10 


7.4 


8 


.44 


.22 


2.2 


753 


450 


384 


187 


41 


28 


11 


10 


6.6 


9 


.27 


.25 


3.5 


361 


1580 


325 


175 


41 


25 


11 


9.3 


5.9 


10 


.27 


.19 


4.0 


360 


1410 


295 


151 


40 


24 


11 


8.5 


6.5 


11 


.19 


.17 


7.8 


286 


1010 


272 


151 


38 


23 


11 


8.5 


6.1 


12 


.18 


.22 


7.7 


235 


849 


246 


142 


36 


21 


11 


9.3 


6.4 


13 


.19 


.20 


5.0 


3310 


713 


243 


135 


30 


22 


10 


9.4 


7.0 


14 


.19 


.13 


3.3 


5600 


611 


235 


128 


30 


20 


10 


10 


6.8 


IS 


.19 


.12 


2.5 


3710 


521 


221 


122 


28 


19 


11 


11 


6.2 


16 


.19 


.13 


2.1 


2930 


454 


207 


115 


27 


17 


11 


9.6 


6.7 


17 


.19 


.16 


1.8 


2960 


412 


221 


114 


27 


20 


11 


9.1 


8.1 


18 


.23 


.15 


1.9 


4940 


449 


225 


135 


27 


16 


15 


8.7 


9.8 


19 


.27 


.13 


1.7 


3480 


1400 


209 


135 


28 


15 


15 


9.1 


8.7 


20 


.23 


.12 


el. 5 


1960 


3580 


189 


120 


28 


17 


14 


8.5 


7.5 


21 


.33 


.13 


el. 4 


3160 


3080 


175 


107 


28 


16 


13 


8.5 


7.0 


22 


.27 


.14 


el. 3 


3400 


1940 


167 


91 


27 


15 


15 


8.5 


6.6 


23 


.27 


.16 


el. 2 


2580 


1620 


163 


80 


27 


16 


14 


8.1 


7.2 


24 


.29 


.17 


el. 2 


1720 


1870 


186 


77 


29 


15 


13 


7.8 


7.4 


25 


.30 


.16 


el.l 


1320 


1510 


215 


73 


33 


15 


13 


8.0 


7.2 


26 


.30 


.17 


el.l 


1040 


2650 


758 


68 


33 


14 


12 


7.9 


7.1 


27 


.32 


.19 


el.O 


854 


2600 


1380 


65 


33 


14 


11 


7.8 


7.3 


28 


.28 


.17 


2.1 


701 


1740 


1130 


59 


33 


14 


11 


6.8 


6.2 


29 


.49 


.18 


58 


558 





911 


57 


29 


12 


10 


7.2 


6.2 


30 


.37 


.18 


133 


467 





703 


59 


27 


12 


12 


8,0 


6.6 


31 


.32 





69 


385 





571 





27 





11 


7.6 





TOTAL 


8.65 


8.16 


320.03 


48345 


32130 


15186 


4803 


1073 


600 


374 


273.6 


218.4 


MEAN 


.28 


.27 


10.3 


1560 


1147 


490 


160 


34.6 


20.0 


12.1 


8.83 


7.28 


MAX 


.50 


.97 


133 


5600 


3580 


1380 


486 


55 


30 


15 


11 


9.8 


MIN 


.16 


.12 


.17 


21 


180 


163 


57 


27 


12 


10 


6.8 


5.9 


AC-FT 


17 


16 


635 


95890 


63730 


30120 


9530 


2130 


1190 


742 


543 


433 


e Estimated. 

























PAJARO RIVER BASIN 



95 



11159000 PAJARO RIVER AT CHITTENDEN, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 19A0 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

5.16 
22.7 
1984 
.10 
1962 



NOV 

32.1 
843 

1951 
.27 

1993 



SIMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

138 
1990 
1956 

.60 
1962 



JAN 

382 
2350 
1952 
1.22 
1991 



FEB 

508 
2641 
1969 
1.28 
1991 



FOR 1992 CALENDAR YEAR 



10614.65 
29.0 



1160 



Feb 16 
.12 Nov 15 
.13 Nov 14 



21050 
57 
3.1 
.23 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



426 
4227 
1983 
1.50 
1977 



254 
3165 
1958 

.97 
1977 



45.6 
646 

1983 
.75 

1977 



FOR 1993 WATER YEAR 



103339.84 
283 



5600 

.12 
.13 
6630 
24.85 
205000 
770 
14 
.23 



Jan 14 

Nov 15 

Nov 14 

Jan 14 

Jan 14 



13.5 
92.9 
1983 
.66 
1977 



JUL 

7.25 

26.2 

1983 

.37 

1961 



AUG 

5.74 
22.1 
1983 
.37 
1948 



SEP 

6.25 

93.3 

1959 

.24 

1961 



WATER YEARS 1940 - 1993 



150 








905 






1983 


1.06 






1977 


21700 


Dec 


24 


1955 


.00 


Jul 


11 


1948 


.00 


Aug 


16 


1948 


24000 


Dec 


24 


1955 


33.11 


Apr 


3 


1958 


108800 








218 








10 








1.0 









96 



PAJARO RIVER BASIN 



11159200 CORRALITOS CREEK AT FREEDOM, CA 

LOCATION. --Lat 36'56'22". long 121''i6'10", in Los Corralitos Grant, Santa Cruz County, Hydrologic Unit 18060002, 
on right bank Just upstream from Green Valley Road Bridge, 0.2 mi north of Freedom, and 2.3 mi north of 
Watsonville. 

DRAINAGE AREA. --27. 8 mi^. 

PERIOD OF RECORD. --October 1956 to current year. 
SEDIMENT DATA: Water years 1976-77, 1980-81. 

GAGE. — Water-stage recorder. Datum of gage is 89.43 ft above sea level. 

REMARKS. --Records fair. No regulation; Watsonville Water Works can divert up to 8.0 ft^/s upstream from station 
for municipal supply, domestic use, and irrigation. 

EXTREMES FOR PERIOD OF RECORD. --yaximura discharge, 5,610 ft^/s, Jan. 4, 1982, gage height, 16.66 ft, from rating 
curve extended above 1,400 ft /s on basis of slope-area measurement of peak flow; no flow at times. 

EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of Dec. 22, 1955, reached a stage of 15.6 ft, from floodmarks, 
discharge, 3,620 ft /s based on contracted-opening measurement of peak flow. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 600 ff^/s and maximum (*) 

Discharge Gage height Discharge 

Date Time (ft^/s) (ft) Date Time (ft^/s) 



Jan. 13 1000 *1,490 
No flow for many days . 



*8.79 



Jan. 20 



Time 
2300 



1,020 



Gage height 
(ft) 

7.75 



DISCHARGE. CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


95 


28 


96 


18 


3.1 


e.30 


.00 


.00 


.00 


2 


.00 


.00 


.00 


53 


25 


82 


16 


2.0 


e.23 


.00 


.00 


.00 


3 


.00 


.00 


.73 


29 


23 


71 


14 


2.1 


e.20 


.00 


.00 


.00 


4 


.00 


.00 


.00 


20 


21 


61 


13 


2.0 


el.l 


.00 


.00 


.00 


S 


.00 


.00 


.00 


16 


22 


53 


12 


2.0 


e6.0 


.00 


.00 


.00 


6 


.00 


.00 


6.5 


31 


19 


48 


12 


1.6 


e2.7 


.00 


.00 


.00 


7 


.00 


.00 


28 


154 


22 


42 


11 


1.2 


el. 3 


.00 


.00 


.00 


8 


.00 


.00 


3.5 


87 


57 


37 


10 


1.2 


e.69 


.00 


.00 


.00 


9 


.00 


.00 


98 


51 


54 


33 


9.7 


1.1 


.30 


.00 


.00 


.00 


10 


.00 


.00 


33 


56 


42 


29 


8.9 


.95 


.13 


.00 


.00 


.00 


11 


.00 


.00 


38 


38 


49 


26 


8.7 


.84 


.03 


.00 


.00 


.00 


12 


.00 


.00 


13 


63 


40 


23 


8.0 


.84 


.06 


.00 


.00 


.00 


13 


.00 


.00 


4.4 


868 


35 


20 


7.7 


.84 


.00 


.00 


.00 


.00 


U 


.00 


.00 


1.1 


292 


31 


18 


7.4 


.84 


.00 


.00 


.00 


.00 


IS 


.00 


.00 


.41 


154 


28 


16 


6.6 


.78 


.00 


.00 


.00 


.00 


16 


.00 


.00 


.20 


123 


27 


14 


6.3 


.75 


.00 


.00 


.00 


.00 


17 


.00 


.00 


3.3 


207 


32 


23 


14 


.67 


.00 


.00 


.00 


.00 


18 


.00 


.00 


.38 


197 


64 


15 


14 


.64 


.00 


.00 


.00 


.00 


19 


.00 


.00 


.05 


116 


127 


12 


9.6 


.53 


.00 


.00 


.00 


.00 


20 


.00 


.00 


.00 


330 


112 


10 


7.9 


.45 


.00 


.00 


.00 


.00 


21 


.00 


.00 


.00 


549 


75 


8.4 


6.7 


.37 


.03 


.00 


.00 


.00 


22 


.00 


.00 


.00 


427 


63 


7.5 


6.3 


.30 


.00 


.00 


.00 


.00 


23 


.00 


.00 


.00 


168 


97 


9.1 


5.9 


.26 


.00 


.00 


.00 


.00 


24 


.00 


.00 


.00 


110 


98 


25 


6.2 


.41 


.00 


.00 


.00 


.00 


2S 


.00 


.00 


.00 


82 


91 


21 


5.4 


5.2 


.00 


.00 


.00 


.00 


26 


.00 


.00 


.00 


67 


205 


31 


4.8 


1.7 


.00 


.00 


.00 


.00 


27 


.00 


.00 


.00 


55 


140 


28 


4.7 


1.1 


.00 


.00 


.00 


.00 


28 


.00 


.00 


125 


46 


113 


26 


4.5 


.88 


.00 


.00 


.00 


.00 


29 


3.0 


.00 


94 


39 





22 


3.7 


.70 


.00 


.00 


.00 


.00 


30 


.18 


.00 


44 


35 





20 


3.3 


.52 


.00 


.00 


.00 


.00 


31 


.00 





26 


31 





18 





e.38 


— 


.00 


.00 


— 


TOTAL 


3.18 


0.00 


519.57 


4589 


1740 


945.0 


266.3 


36.25 


13.07 


0.00 


0.00 


0.00 


MEAN 


.10 


.000 


16.8 


148 


62.1 


30.5 


8.88 


1.17 


.44 


.000 


.000 


.000 


MAX 


3.0 


.00 


125 


858 


205 


96 


18 


5.2 


6.0 


.00 


.00 


.00 


MIN 


.00 


.00 


.00 


16 


19 


7.5 


3.3 


.26 


.00 


.00 


.00 


.00 


AC-FT 


6.3 


.00 


1030 


9100 


3450 


1870 


528 


72 


26 


.00 


.00 


.00 


e Estimated. 

























PAJARO RIVER BASIN 



97 



11159200 CORRALITOS CREEK AT FREEDOM, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1957 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR AFR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.90 


5.39 


13.8 


42.7 


52.1 


35.7 


22.8 


4.42 


.89 


.37 


.17 


.68 


MAX 


17.4 


37.3 


86.7 


167 


256 


209 


166 


39.1 


9.10 


4.77 


1.15 


20.8 


(WY) 


1963 


1984 


1965 


1982 


1986 


1983 


1958 


1983 


1983 


1983 


1983 


1959 


MIN 


.000 


.000 


.000 


.000 


.003 


.076 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1962 


1981 


1991 


1991 


1991 


1988 


1977 


1977 


1962 


1961 


1961 


1961 



SIMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1957 - 1993 



2566.12 






8112.37 










7.01 






22.2 






14.8 
56.4 
.17 


1983 
1977 


540 


Feb 


20 


868 


Jan 


13 


2290 


Jan 4 1982 


.00 


Jan 


1 


.00 


Oct 


1 


.00 


Jun 12 1957 


.00 


Jan 


10 


.00 


Oct 


1 


.00 


Jun 12 1957 








1490 


Jan 


13 


5610 


Jan 4 1982 








8.79 


Jan 


13 


16.66 


Jan 4 1982 


5090 






16090 






10720 




11 






59 






30 




.00 






.05 






.37 




.00 






.00 






.00 





98 



SOQUEL CREEK BASIH 
11160000 SOQUEL CREEK AT SOQUEL, CA 



LOCATION. --Lat 36*59'29", long 121*57'17". In NE 1/4 sec. 10, T.ll S., R.l W. , Santa Cruz County. Hydrologlc Unit 
18060001, on left bank 0.2 mi upstream from highway bridge in town of Soquel and . 4 mi downstream from Bates 
Creek. 

DRAINAGE AREA. --40. 2 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. — May 1951 to current year. 

REVISED RECORDS. --WSP 1715: Drainage area. WSP 2129: 1958, 1959-60(P). 

GAGE. — Water-stage recorder and crest-stage gage. Datum of gage is 21.38 ft above sea level. 

RQ4ARKS. --Records fair except for estimated daily discharges, which are poor. No regulation; many diversions 
upstream from station for irrigation. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 15,800 ft^/s, Dec. 23, 1955, gage height, 22.33 ft, from 

rating curve extended above 2,900 ft /s on basis of slope-area measurement of peak flow; no flow at times In 
1977, 1988, 1992, and 1993. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,000 ft^/s and maximum (*): 

Discharge Gage height Discharge Gage height 

Date Time (ft^/s) (ft) Date Time (ft^/s) (ft) 



Jan. 13 0615 
Jan. 20 2200 

No flow Oct. 3-13. 



♦2.800 
1,830 



•10.09 
8.37 



Date 
Feb. 18 



Time 
2230 



1,450 



DAY 



OCT 



DISCHARGE. 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



7.55 



AUG 



SEP 



1 


.04 


3.7 


2.2 


299 


60 


127 


51 


14 




12 


5.7 


3.0 


el. 8 


2 


.10 


2.9 


4.4 


109 


56 


110 


46 


13 




10 


5.8 


2.7 


el. 7 


3 


.00 


2.1 


16 


48 


54 


98 


42 


14 




10 


6.2 


2.5 


el. 7 


A 


.00 


1.8 


7.4 


38 


51 


88 


40 


14 




15 


5.7 


2.5 


el. 7 


5 


.00 


1.6 


5.3 


34 


52 


82 


36 


13 




23 


5.7 


2.5 


el. 7 


6 


.00 


1.5 


19 


83 


48 


77 


34 


13 




20 


5.5 


2.5 


el. 7 


7 


.00 


1.5 


54 


559 


49 


72 


34 


13 




16 


5.3 


2.6 


el. 7 


8 


.00 


1.5 


15 


282 


e82 


68 


33 


13 




14 


5.4 


2.2 


el. 7 


9 


.00 


1.6 


163 


160 


88 


64 


30 


12 




13 


5.6 


2.2 


el. 7 


10 


.00 


1.4 


108 


160 


68 


61 


30 


13 




12 


5.3 


2.1 


el. 7 


11 


.00 


1.3 


104 


97 


113 


58 


28 


12 




12 


5.2 


1.7 


el. 7 


12 


.00 


1.5 


30 


221 


75 


56 


27 


12 




11 


5.0 


1.7 


el. 7 


13 


.00 


1.6 


19 


1610 


64 


54 


26 


11 




10 


5.0 


2.1 


el. 8 


14 


.11 


1.8 


14 


546 


59 


53 


24 


10 




8.8 


5.0 


2.6 


el. 7 


15 


.08 


1.6 


11 


329 


56 


51 


24 


9 


7 


7.4 


4.9 


2.8 


el. 7 


16 


.06 


1.9 


9.6 


272 


52 


48 


24 


9 


7 


7.5 


4.6 


2.7 


el. 7 


17 


.04 


1.7 


11 


534 


109 


57 


39 


10 




7.3 


4.3 


2.4 


el. 7 


18 


.02 


2.7 


10 


574 


494 


50 


39 


9 


8 


7.3 


4.0 


2.2 


el. 7 


19 


.05 


2.3 


8.3 


247 


707 


46 


28 


9 


2 


7.3 


3.9 


2.0 


el. 6 


20 


.14 


2.4 


7.8 


860 


449 


43 


24 


9 


2 


7.2 


4.3 


1.7 


el. 6 


21 


.96 


2.5 


7.2 


923 


262 


41 


23 


9 


2 


6.9 


5.0 


1.9 


el. 6 


22 


.50 


3.2 


6.8 


833 


184 


39 


21 


9 


2 


6.7 


3.4 


2.0 


el. 6 


23 


.39 


3.4 


6.5 


424 


242 


42 


21 


9 


3 


6.8 


e3.6 


2.0 


el. 6 


24 


.29 


3.1 


5.8 


e310 


202 


80 


21 


11 




6.5 


e3.8 


2.0 


el. 6 


25 


.30 


2.9 


5.5 


e235 


156 


55 


20 


22 




6.2 


e4.0 


1.9 


el. 6 


26 


.44 


2.7 


5.3 


el85 


401 


98 


18 


12 




6.6 


e4.1 


1.7 


el. 5 


27 


.52 


2.7 


5.3 


el53 


214 


78 


18 


12 




6.4 


4.2 


1.6 


el. 6 


28 


.53 


2.5 


138 


el20 


156 


74 


17 


11 




6.2 


3.8 


1.3 


el. 6 


29 


22 


2.5 


141 


e90 





62 


16 


10 




6.2 


3.7 


1.3 


el. 6 


30 


16 


2.5 


63 


71 





55 


16 


9 


8 


6.1 


3.5 


1.6 


el. 6 


31 


6.3 





29 


64 





51 





14 







3.3 


1.7 





TOTAL 


48.87 


66.4 


1032.4 


10470 


4603 


2038 


850 


364 


1 


295.4 


144.8 


65.7 


49.9 


MEAN 


1.58 


2.21 


33.3 


338 


164 


65.7 


28.3 


11 


7 


9.85 


4.67 


2.12 


1.66 


MAX 


22 


3.7 


163 


1610 


707 


127 


51 


22 


23 


6.2 


3.0 


1.8 


MIN 


.00 


1.3 


2.2 


34 


48 


39 


16 


9 


2 


6.1 


3.3 


1.3 


1.5 


AC-FT 


97 


132 


2050 


20770 


9130 


4040 


1690 


722 


586 


287 


130 


99 


e Estimated. 



























SOQUEL CREEK BASIN 



99 



11160000 SOQUEL CREEK AT SCX5UEL, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1993, BY WATER YEAR (WY) 



MEAN 

MAX 

(MY) 

MIN 

(WY) 



OCT 

6.73 

111 
1963 

.65 
1989 



NOV 

17.0 
78.5 
1973 
1.36 
1991 



StnWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

60.3 
625 
1956 
2.74 
1991 



JAN 

113 

*37 

1952 

2.57 

1991 



FEB 

117 

596 

1986 

3.96 

1977 



FOR 1992 CALENDAR YEAR 

7792.12 
21.3 



659 



Feb 20 
.00 Aug 15 
.00 Aug IS 



15A60 
35 
4.6 
.06 



MAR 

94.0 
577 
1983 
3.97 
1988 



APR 

56.2 
324 
1982 
2.81 
1977 



MAY 

18.6 
95.9 
1983 
2.26 
1977 



FOR 1993 WATER YEAR 

20028.57 
54.9 



1610 

.00 
.00 
2800 
10.09 
39730 
123 
9.2 
1.5 



Jan 13 

Oct 3 

Oct 3 

Jan 13 

Jan 13 



JUN 

8.75 
28.8 
1983 
.91 
1977 



JUL 

4.93 
15.3 
1983 
.26 
1977 



AUG 

3.11 
10.5 
1983 
.17 
1977 



WATER YEARS 1951 



SEP 

3.13 
22.4 

1959 

.11 

1992 

1993 



41.5 








169 






1983 


2.89 






1977 


8800 


Dec 


23 


1955 


.00 


Jul 


30 


1977 


.00 


Aug 


15 


1992 


15800 


Dec 


23 


1955 


22.33 


Dec 


23 


1955 


30100 








79 








7.3 








1.5 









100 SOQUEL CREEK BASIN 

11160000 SOQUEL CREEK AT SOQUEL, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1952-79, January 1990 to May 1993 (discontinued). 
CHEMICAL DATA: Water years 1952-66, 1977. 
WATER TEMPERATURE: Water years 1966-79. 
SEDIMENT DATA: Water years 1976-77. January 1990 to May 1993 (discontinued). 

PERIOD OF DAILY RECORDS. -- 

WATER TEMPERATURE: January 1966 to February 1979. 

REMARKS. — Zero bedload discharge observed for flows less than 15 ft /s during current year. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 



DIS- 






SEDI- 


SED. 


SED. 


SED. 


SED. 


SED. 


CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


INST. 




SEDI- 


DIS- 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


X FINER 


I FINER 


I FINER 


Z FINER 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 


THAN 


THAN 


SECOND 


(DEC C) 


(MG/L) 


(T/DAY) 


.062 m 


.125 ^« 


.250 m 


.500 hW 


1.00 m 



112S 



1.6 



9.0 



0.00 



1240 


15 


1110 


12 


1500 


102 


1045 


71 


1350 


1600 


1445 


83 


1315 


52 


1515 


349 


1215 


56 


1630 


15 



10.0 


80 


3.2 


8.5 


13 


0.42 


9.5 


388 


107 


7.5 


95 


18 


11.5 


6780 


29300 


12.0 


94 


21 


10.0 


22 


3.1 


11.0 


457 


431 


12.5 


20 


3.0 


15.0 


6 


0.24 



96 100 
51 62 



72 



91 



96 



98 



NOV 

12. .. 
DEC 

03. . 

08. . 

29. . 
JAN 

12.. 

13.. 

29. . 
FEB 

16. . 
*26. . 
MAR 

30. . 
MAY 

10.. 

* Sample collected at center of flow only. 

PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



94 
71 
49 

36 
58 
39 

54 



100 



100 









DIS- 




BED 


BED 


BED 


BED 






NUMBER 


CHARGE, 




MAT. 


MAT. 


MAT. 


MAT. 






OF 


INST. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 






SAM- 


CUBIC 


TEMPER- 


DIAM. 


DIAM. 


DIAM. 


DIAM. 






PLING 


FEET 


ATURE 


I FINER 


Z FINER 


Z FINER 


Z FINER 


DATE TIME 


POINTS 


PER 


WATER 


THAN 


THAN 


THAN 


THAN 






(COUNT) 


SECOND 


(DEG C) 


.062 ^« 


.125 hW 


.250 ^M 


.500 rw 


NOV 
12.. 


1155 




1.6 


9.0 


2 


15 


40 


48 


12.. 


1200 




1.6 


9.0 


1 


4 


14 


19 


12.. 


1206 




1.6 


9.0 


1 


3 


11 


15 


12.. 


1210 




1.6 


9.0 


1 


2 


9 


14 


12.. 


1215 




1.6 


9.0 


-- 


-- 


2 


6 


12.. 


1222 




1.6 


9.0 


-- 


-- 


1 


4 


12.. 


1226 




1.6 


9.0 


-- 


-- 


3 


11 


12.. 


1235 




1.6 


9.0 


1 


3 


21 


62 


12.. 


1240 




1.6 


9.0 


7 


24 


61 


93 


DEC 


















29.. 


1400 




110 


9.0 


18 


42 


91 


97 


29.. 


1405 




110 


9.0 


1 


4 


13 


18 


29.. 


1410 




109 


9.0 


-- 


-- 


2 


3 


29.. 


1413 




108 


9.0 


— 


-- 


1 


4 


29.. 


1420 




108 


9.0 


-- 


-- 


1 


4 


29.. 


1425 




108 


9.0 


-- 


-- 


-- 


1 


29.. 


1430 




108 


9.0 


-- 


-- 


3 


36 


29.. 


1435 




106 


9.0 


-- 


1 


14 


47 


29.. 


1440 




104 


9.0 


10 


30 


68 


92 


FEB 


















16.. 


1347 




51 


10.0 


— 


1 


3 


7 


16.. 


1349 




51 


10.0 


-- 


— 


3 


6 


16.. 


1352 




51 


10.0 


-- 


— 


1 


4 


16.. 


1355 




51 


10.0 


-- 


— 


1 


7 


16.. 


1407 




51 


10.0 


— 


— 


2 


8 


16.. 


1410 




51 


10.0 


-- 


— 


1 


a 


16.. 


1415 




51 


10.0 


-- 


1 


7 


29 


16.. 


1422 




51 


10.0 


6 


10 


30 


83 


16.. 


1430 




51 


10.0 


11 


44 


92 


100 



SOQUEL CREEK BASIN 
11160000 SOQUEL CREEK AT SOQUEL. CA- -Continued 



101 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 





DIS- 




BED 


BED 


BED 


BED 


NUMBER 


CHARGE, 




MAT. 


MAT. 


MAT. 


MAT. 


OF 


INST. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SAM- 


CUBIC 


TEMPER- 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


PLING 


FEET 


ATURE 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


POINTS 


PER 


WATER 


THAN 


THAN 


THAN 


THAN 


COUNT ) 


SECOND 


(DEG C) 


.062 m 


.125 Ml 


.250 tti 


.500 Ml 



MAR 


















30.. 


1316 




55 


12.5 


2 


6 


12 


16 


30.. 


1325 




55 


12.5 


— 


1 


4 


6 


30.. 


1333 




55 


12.5 


— 


— 


2 


5 


30.. 


1336 




55 


12.5 


— 


— 


1 


5 


30.. 


1339 




56 


12.5 


— 


— 


2 


10 


30. . 


1342 




56 


12.5 


-- 


— 


2 


9 


30.. 


1350 




56 


12.5 


-- 


-- 


3 


17 


30.. 


1355 




55 


12.5 


4 


10 


29 


64 


30.. 


1358 




55 


12.5 


8 


36 


84 


97 




BED 


BED 


BED 


BED 


BED 


BED 


BED 


BED 




MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DA- 


rE THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 




1.00 NM 


2.00 hM 


4.00 Ml 


8.00 Ml 


16.0 Ml 


32.0 Ml 


64.0 Ml 


128 M^ 


NOV 


















12.. 


50 


51 


52 


54 


57 


72 


91 


100 


12.. 


20 


21 


23 


29 


44 


70 


100 


-- 


12.. 


16 


17 


21 


27 


40 


86 


100 


-- 


12.. 


17 


20 


25 


34 


47 


70 


100 


-- 


12.. 


9 


12 


16 


22 


34 


53 


88 


100 


12.. 


8 


13 


19 


28 


44 


76 


100 


— 


12.. 


22 


33 


42 


58 


78 


97 


100 


— 


12.. 


79 


83 


86 


87 


90 


93 


100 


— 


12.. 


100 


-- 


-- 


— 


— 


— 


— 


— 


DEC 


















29.. 


98 


99 


100 


-- 


— 


— 


— 


— 


29.. 


19 


19 


21 


25 


36 


67 


100 


— 


29.. 


4 


4 


6 


12 


28 


6S 


100 


— 


29.. 


6 


10 


16 


25 


43 


67 


100 


— 


29.. 


9 


16 


22 


31 


46 


70 


100 


— 


29.. 


2 


3 


6 


11 


24 


73 


100 


— 


29.. 


76 


91 


96 


98 


100 


— 


— 


~~ 


29.. 


79 


90 


92 


94 


100 


— 


— 


— 


29.. 


97 


99 


100 


— 


— 


— 


— 


— 


FEB 


















16.. 


8 


10 


13 


20 


35 


61 


100 


— 


16. . 


10 


20 


32 


46 


64 


100 


— 


— 


16.. 


10 


14 


18 


24 


36 


73 


100 


-- 


16.. 


12 


16 


20 


25 


38 


65 


100 


— 


16. . 


21 


33 


43 


52 


66 


81 


100 


— 


16.. 


18 


25 


31 


38 


50 


70 


100 


-- 


16.. 


50 


64 


70 


75 


81 


89 


100 


-" 


16.. 


96 


98 


100 


-- 


-- 


-- 


-- 


— 


16.. 


. 


— 


— 


— 


-- 


-- 


-- 


~~ 


MAR 


















30.. 


17 


18 


22 


27 


37 


58 


100 


~~ 


30. . 


7 


9 


14 


21 


36 


63 


100 


— 


30. . 


7 


11 


18 


27 


40 


69 


100 


— 


30. . 


11 


18 


24 


32 


51 


88 


100 


— 


30. . 


25 


36 


42 


47 


57 


77 


100 


"~ 


30. . 


20 


28 


33 


38 


47 


71 


100 


— 


30. . 


42 


61 


70 


73 


79 


91 


100 


-- 


30. . 


95 


99 


100 


— 


— 


— 


— 


— 


30.. 


99 


100 


— 


— 


— 


— 


— 


**~ 



102 



SOQUEL CREEK BASIN 
11160000 SOQUEL CREEK AT SOQUEL, CA- -Continued 



PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



























TIME HORI- COMPSTD 














BAG TETHER 








ON 


BED ZONTAL SAMPLES 














MESH LINE 


START- 


END- FOR WIDTH IN 






SAM- 






SIZE USED IN 


ING 


ING BED OF X-SEC 






PLING 


SAMPLER 


BEDLOAD SAMPLNG 


TIME 


TIME LOAD VER- BEDLOAD 


DATE 


TIME 


METHOD. 


TYPE 


SAMPLER (YES-1) 


(2400 


(2400 SAMPLE TICAL MEASMNT 






CODES 


(CODE) 


(»1) (CODE) 


HOURS) 


HOURS (SEC) (FEET) (NUM) 


DEC 






























29... 


1250 




1000 




1150 





.250 







1242 




1301 


30 


1.0 2 


29... 


1310 




1000 




1150 





.250 







1305 




1320 


30 


1.0 2 


JAN 






























12... 


1115 




1000 




1150 





.250 







1113 




1120 


20 


1.0 2 


12... 


1125 




1000 




1150 





.250 







1121 




1130 


20 


1.0 2 


13... 


1425 




1000 




1140 





.250 







1410 




1438 


15 


4.0 1 


29... 


1625 




1000 




1150 





.250 







1615 




1630 


20 


2.0 2 


29... 


1655 




1000 




1150 





.250 







1645 




1700 


20 


2.0 2 


FEB 






























16... 


1220 




1000 




1150 





250 







1210 




1228 


30 


1.0 2 


16... 


1240 




1000 




1150 





250 







1234 




1250 


30 


1.0 2 


MAR 






























30... 


1240 




1000 




1150 





250 







1229 




1248 


30 


1.0 2 


30... 


1300 




1000 




1150 





250 







1250 




1308 


30 


1.0 2 




VER 








SAMPLE 


DIS- 






DISCH, 


SEDI- 


SED. 


SED. 




TICALS 


NUMBER 


LOC 




CHARGE, 






BEDLOAD 


MENT 


BEDLOAD 


BEDLOAD 




IN 




OF 


ATION, 


INST. 






AV UNIT 


DIS- 


SIEVE 


SIEVE 




COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 


DIAM. 


DIAM. 




POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 


Z FINER 


Z FINER 


DATE SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(IONS/ 


THAN 


THAN 




(NUM) 


(COUNT) 


L BANK) 


SECOND 


(DEG C) 


T/D/FT 


DAY) 


.062 m 


.125 m 


DEC 






























29. . 




25 




25 


-- 




116 


9 


5 





68 


20 





__ 


29.. 




25 




25 


-- 




115 


9 


5 





87 


20 


— 





JAN 






























12.. 




20 




20 


-- 




78 


7 


5 


1 


85 


39 


— 


— 


12.. 




20 




20 


-- 




79 


7 


5 


2 


01 


39 


-- 


-- 


13. . 




10 




10 


2 


00 


1740 


11 


5 


15 


9 


636 


1 


2 


29.. 




14 




14 


2 


00 


78 


12 








23 


5.9 


-- 


— 


29.. 




1* 




14 


2 


00 


78 


12 








19 


5.9 


— 


— 


FEB 






























16.. 




26 




26 


7 


00 


52 


10 








67 


16 


— 


— 


16.. 




26 




26 


7 


00 


52 


10 








53 


16 


-- 





MAR 






























30. . 




28 




28 


6 


00 


56 


12 


5 





20 


5.0 


-- 





30.. 




28 




28 


6 


00 


56 


12 


5 





16 


5.0 


-- 


— 




SED. 


SED. 


SED. 


SED. 


SED 




SED. 


SED. 


SED. 


SED. 




BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM 




DIAM. 


DIAM. 


DIAM. 


DIAM. 




X FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


I FINER 


Z FINER 


Z FINER 


DAI 


rE THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 




.250 


m 


.500 


tf^ 


1.00 


tt\ 


2.00 ^M 


4.00 m 


8.00 


^t^ 


16.0 ^M 


32.0 (♦! 


64.0 ^W 


DEC 






























29.. 


16 




75 




94 




97 


99 




99 




100 


-- 


_- 


29.. 


13 




68 




90 




96 


98 




100 




-- 


-- 


-- 


JAN 






























12.. 


5 




33 




66 




87 


95 




98 




99 


100 





12.. 


7 




49 




82 




93 


96 




98 




99 


100 


— 


13.. 


10 




31 




54 




73 


84 




90 




94 


97 


100 


29.. 


5 




46 




75 




89 


95 




98 




100 


-- 


— 


29.. 


5 




55 




76 




83 


86 




88 




92 


100 


— 


FEB 






























16.. 


3 




22 




45 




62 


72 




81 




87 


100 


-- 


16.. 


2 




27 




52 




71 


80 




84 




89 


100 


— 


MAR 






























30. . 


1 




6 




23 




40 


52 




58 




69 


77 


100 


30. . 


1 




8 




16 




26 


34 




41 




49 


73 


100 



SAN LORENZO RIVER BASIN 



103 



11160020 SAN LORENZO RIVER NEAR BOULDER CREEK, CA 

LOCATION. --Lot 37*12'2'.", Long 122'08'38", in NE 1/4 SW l/A sec. 25, T.8 S., R.3 W. , Santa Cruz County, Hydrologic 
Unit 18060001, on right bank 22 ft upstream from culvert on State Highway 9, 100 ft upstream from small 
right-bank tributary, and S.8 mi north of town of Boulder Creek. 

DRAINAGE AREA.— 6.17 mi^. 

PERIOD OF RECORD.— July 1968 through December 1992 (discontinued). 
CHEMICAL DATA: Water years 1973-75, 1977, 1980-81. 
SEDIMENT DATA: Water year 1976. 

GAGE. --Water-stage recorder and concrete control. Elevation of gage is 710 ft above sea level, from topographic 
map. 

a 

REMARKS. --No estimated daily discharges. Records good except for daily discharges greater than 5.0 ft /s, which 
are fair. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 1,050 ft^/s, Jan. 4, 1982, gage height, 11.48 ft, from^rating 
curve extended above 230 ft^/s on basis of slope-area measurement of peak flow; minimum daily, 0.08 ft /s, 
Aug. 2, 1977. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.64 


.63 


.63 


2 


.68 


.63 


.81 


3 


.53 


.61 


1.1 


4 


.53 


.56 


.68 


S 


.53 


.58 


.63 


6 


.51 


.57 


5.6 


7 


.46 


.57 


3.0 


8 


.44 


.63 


2.1 


9 


.42 


.60 


9.0 


10 


.43 


.56 


16 


11 


.42 


.58 


6.6 


12 


.43 


.63 


2.5 


13 


.42 


.62 


1.7 


14 


.44 


.55 


1.4 


IS 


.44 


.55 


1.3 


16 


.44 


.54 


1.1 


17 


.44 


.60 


1.4 


IB 


.44 


.63 


1.3 


19 


.44 


.59 


1.2 


20 


.46 


.63 


1.1 


21 


.59 


.63 


1.1 


22 


.52 


.71 


1.1 


23 


.47 


.63 


1.1 


24 


.45 


.63 


1.1 


25 


.48 


.63 


.98 


26 


.49 


.63 


.98 


27 


.49 


.63 


.98 


2B 


.53 


.63 


3.4 


29 


2.9 


.63 


4.5 


30 


.97 


.63 


2.9 


31 


.67 





2.1 


TOTAL 


18.10 


18.24 


79.39 


MEAN 


.58 


.61 


2.56 


MAX 


2.9 


.71 


16 


MIN 


.42 


.54 


.63 


AC-FT 


36 


36 


157 



104 



SAN LORENZO RIVER BASIN 
11160020 SAN LORENZO RIVER NEAR BOULDER CREEK, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1968 - 1993. BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


.86 


2.71 


5.40 


14.2 


19.5 


16.7 


8.48 


3.25 


1.83 


1.18 


.83 


.70 


MAX 


2.60 


12.8 


40.6 


51.4 


81.1 


102 


56.6 


16.7 


5.07 


3.15 


2.16 


1.57 


(*«) 


1990 


1984 


1984 


1969 


1986 


1983 


1982 


1983 


1983 


1983 


1983 


1983 


HIH 


.21 


.44 


.51 


.62 


.54 


.77 


,45 


.58 


.37 


.17 


.11 


.18 


(Wlf) 


1976 


1989 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1988 



SUM1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



979.61 
2.68 



WATER YEARS 1968 



1993 



115 



Feb 12 
.37 Sep 20 
.37 Sep 20 



1940 
4.7 
.98 
.44 



6.26 








23.3 






1983 


.43 






1977 


527 


Mar 


2 


1983 


.08 


Aug 


2 


1977 


.09 


Jul 


30 


1977 


1050 


Jan 


4 


1982 


11.48 


Jan 


4 


1982 


4540 








12 








1.3 








.43 









SAN LORENZO RIVER BASIN 105 

11160060 BEAR CREEK AT BOULDER CREEK. CA 

LOCATION. --Lat 37°07''iO", long 122"06'57", in NW 1/4 NW 1/A sec. 29, T.9 S., R.2 W. , Santa Cruz County, Hydrologic 
Unit 18060001, on left bank on downstream side of private road bridge in town of Boulder Creek and 0.3 mi 
upstream from mouth. 

DRAINAGE AREA. —16.0 mi^. 

PERIOD OF RECORD. --October 1977 through December 1992 (discontinued). 

GAGE. — Water-stage recorder and crest-stage gage. Elevation of gase Is A60 ft above sea level, from topographic 
map. 

REMARKS. --Records fair except for estimated daily discharges, which are poor. No regulation; small diversions 
upstream from station for domestic use. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 4,480 ft^/s, Jan. 4, 1982, gage height, 13.30 ft, from ^rating 
curve extended ab 
Sept. 8, 9, 1988. 



__ . — rjaximuiii ui.£>uiiuLge , h,hou i.u /&, <jaii, •* , x^u^, ^ae>° iioAg,*,!-, ^^ , w *.«, -.-.««,* 

curve extended above 600 ft^/s on basis of slope-area measurement of peak flow; minimum daily, 0.09 ft /s. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 

DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 



1 


e.l2 


e.40 


.78 


2 


e.l2 


.37 


2.0 


3 


e.l2 


.38 


2.6 


4 


e.l2 


.41 


1.0 


5 


e.l2 


.37 


.67 


6 


e.l2 


.37 


35 


7 


e.l2 


.39 


14 


8 


e.l2 


.41 


7.8 


9 


e.l2 


.41 


39 


10 


e.l2 


.41 


64 


11 


e.l2 


.41 


32 


12 


e.l2 


.42 


9.7 


13 


e.l2 


.45 


5.3 


14 


e.ll 


.45 


3.1 


IS 


e.ll 


.47 


2.2 


16 


a. 10 


.48 


1.7 


17 


e.lO 


.50 


2.1 


18 


e.lO 


.50 


2.0 


19 


e.ll 


.53 


1.4 


20 


e.ll 


.55 


1.2 


21 


e.4S 


.59 


1.1 


22 


e.33 


.75 


1.0 


23 


e.21 


.82 


.94 


24 


e.l4 


.86 


.86 


2S 


e.l3 


.86 


.86 


26 


a. 14 


.86 


.75 


27 


a. IS 


.86 


.72 


28 


e.l5 


.74 


25 


29 


el8 


.72 


25 


30 


e4.0 


.72 


11 


31 


e.65 





7.0 


TOTAL 


26.65 


16.46 


301.78 


MEAN 


.86 


.55 


9.73 


MAX 


18 


.86 


64 


MIN 


.10 


.37 


.67 


AC-FT 


53 


33 


599 


e Estimated. 







106 



SAN LORENZO RIVER BASIN 



11160060 BEAR CREEK AT BOULDER CREEK. CA--Contlnuod 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1978 - 1993, BY WATER YEAR (WY) 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

1.00 
2.39 
1983 
.18 
1978 



NOV 

5.21 
22.8 
1984 
.55 
1993 



SUMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

12.9 
63.8 
1984 
1.54 
1991 



JAN 

35.3 
127 

1978 
.97 

1991 



FEB 

52.6 
236 
1986 
2.01 
1991 



MAR 

45.6 
226 
1983 
1.78 
1988 



APR 

27.1 
216 
1982 
2.03 
1990 



FOR 1992 CALENDAR YEAR 



3121.54 
8.53 



410 



Feb 12 
.10 Aug 22 

.11 Oct 14 



6190 
16 
1.1 
.12 



MAY 

8.18 
49.6 
1983 
.93 
1989 



JUN 

3.31 
13.7 
1983 
.55 
1969 



JUL 

1.69 
6.50 
1983 
.20 
1969 



AUG 

.89 
3.67 
1983 

.20 
1987 



SEP 

.72 
2.20 
1982 

.12 
1992 



WATER YEARS 1978 - 1993 



16.1 
57.9 
2.44 
1840 

.09 
.11 
4480 
13.30 
11630 
29 
2. 



1983 
1988 
Jan 4 1982 
Sep 8 1988 
Oct 14 1992 
Jan 4 1982 
Jan 4 1982 



.0 
.32 



SAN LORENZO RIVER BASIN 
11160070 BOULDER CREEK AT BOULDER CREEK, CA 



107 



LOCATION. --Lat 37*07'36", long 122*07'18", in NW 1/A NE IIU sec. 30, T.9 S. , R.2 W. , Santa Cruz County, Hydrologic 
Unit 18060001, on right bank under bridge on State Highway 9 in town of Boulder Creek and 750 ft upstream froai 
mouth. 

DRAINAGE AREA. --11. 3 mi^. 

PERIOD OF RECORD. — October 1976 through December 1992 (discontinued). 
CHEMICAL DATA: Water years 1973-75, 1977. 
SEDIMENT DATA: Water years 1976-77. 

REVISED RECORDS.— WDR CA-84-2: 1980, 1982-83. 

GAGE. — Water-stage recorder and crest-stage gage. Elevation of gage is 470 ft above sea level, from topographic 
map. 

REMARKS. — Records good except for estimated daily discharges, which are fair. No regulation; small diversions 
upstream from station for domestic use. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 3,500 ft^/s, Jan. 4, 1982, gage height, 9.50 ft, from rating 
curve extended above 330 ft /s on basis of slope-area measurement at gage height 6.03 ft; minimum daily, 
0.35 ft^/s, Oct. 16, 17, 1977. 



DAY 



OCT 



DISCHARGE, 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.56 


.72 


1.7 


2 


.57 


.76 


4.3 


3 


.53 


.80 


4.0 


4 


.53 


.80 


82.3 


5 


.50 


.72 


ai.g 


6 


.47 


.76 


48 


7 


.48 


.80 


17 


8 


.44 


.84 


27 


9 


.44 


.88 


88 


10 


.42 


.88 


102 


11 


.42 


.97 


48 


12 


.43 


.97 


19 


13 


.44 


.95 


11 


14 


.44 


.88 


6.9 


IS 


.52 


.88 


5.6 


16 


.43 


.88 


4.9 


17 


.42 


.88 


7.5 


18 


.42 


.93 


4.9 


19 


.42 


1.1 


4.2 


20 


.44 


1.3 


3.7 


21 


.88 


1.3 


3.5 


22 


.54 


2.0 


3.3 


23 


.48 


1.8 


3.3 


24 


.47 


1.7 


3.1 


2S 


.47 


1.7 


3.1 


26 


.50 


1.7 


2.9 


27 


.53 


1.7 


2.9 


28 


.53 


1.7 


30 


29 


24 


1.7 


25 


30 


2.7 


1.7 


12 


31 


.89 





9.9 


TOTAL 


41.31 


34.70 


510.9 


MEAN 


1.33 


1.16 


16.5 


MAX 


24 


2.0 


102 


MIN 


.42 


.72 


1.7 


AC-FT 


82 


69 


1010 


e Estimated. 







108 



SAN LORENZO RIVER BASIN 
11160070 BOULDER CREEK AT BOULDER CREEK, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1977 - 1993, BY WATER YEAR (WY) 
OCT NOV DEC JAN FEB MAR APR MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


1.52 


6.67 


17.2 


35.2 


51.* 


*5.4 


21.3 


7.83 


3.52 


2.10 


1.38 


1.14 


MAX 


3.59 


35.8 


88.2 


133 


172 


195 


124 


35.5 


9.92 


5.27 


2.74 


1.94 


(WY) 


1980 


1984 


198A 


1978 


1986 


1983 


1982 


1983 


1983 


1983 


1983 


1983 


MIN 


.50 


.69 


1.38 


.96 


1.'.8 


2.48 


.99 


.82 


.67 


.54 


.55 


.65 


(WY) 


1978 


1991 


1991 


1991 


1977 


1988 


1977 


1977 


1977 


1977 


1977 


1988 



SUmARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



4428.50 
12.1 



434 



Feb 12 

42 Oct 10 

43 Oct 8 



8780 
26 

2.8 
.72 



WATER YEARS 1977 



1993 



16.1 








49.5 






1983 


1.20 






1977 


941 


Feb 


17 


1986 


.35 


Oct 


16 


1977 


.38 


Oct 


13 


1977 


3500 


Jan 


4 


1982 


9.50 


Jan 


4 


1982 


11650 








33 








2.5 








.80 









SAN LORENZO RIVER BASIN 109 

11160300 ZAYANTE CREEK AT ZAYANTE, CA 

LOCATION. --Lat 37'05'10", long 122*02'«5". in SE 1/4 sec. 2, T.IO S., R.2 W. , Santa Cruz County, Hydrologic Unit 
18060001, on left bank at downstream side of bridge on Zayante Road in town of Zayante, 0.4 mi upstream from 
Lompico Creek, 2.0 mi east of Ben Lomond, and 3.2 mi upstream from mouth. 

DRAINAGE AREA.— 11.1 mi^. 

PERIOD OF RECORD. --October 1957 through December 1992 (discontinued). 
CHEMICAL DATA; Water years 1973-74, 1977. 
WATER TEMPERATURE: Water years 1970-73. 
SEDIMENT DATA: Water years 1970-73, 1976-77. 

GAGE. — Water-stage recorder and bedrock notch low-flow control. Datum of gage is 372.44 ft above sea level. 
Prior to Oct. 17, 1989, at datum 0.04 ft higher. 

RQ1ARKS. — No estimated daily discharges. Records fair. No known regulation; small diversions upstream from 
station for individual use. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 4,620 ft^/s, Jan. 14, 1978, gage height, 8.52 ft, from rating 
curve extended above 1,200 ft /s on basis of slope-area measurement at gage height 7.70 ft; maximtim gage 
height, 8.86 ft, Jan. 4, 1982; no flow at times. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 

DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 



1 


.14 


.38 


.43 


2 


.19 


.35 


.65 


3 


.15 


.30 


2.2 


4 


.13 


.28 


.76 


5 


.12 


.31 


.56 


6 


.11 


.32 


7.4 


7 


.10 


.32 


11 


8 


.10 


.32 


4.9 


9 


.12 


.32 


25 


10 


.14 


.32 


30 


11 


.15 


.35 


18 


12 


.15 


.34 


6.6 


13 


.16 


.36 


4.1 


14 


.18 


.37 


3.1 


IS 


.21 


.38 


2.6 


16 


.20 


.38 


2.3 


17 


.15 


.40 


2.7 


18 


.13 


.41 


2.3 


19 


.14 


.40 


2.0 


20 


.15 


.40 


1.9 


21 


.36 


.41 


1.8 


22 


.42 


.46 


1.8 


23 


.45 


.46 


1.7 


24 


.51 


.45 


1.6 


2S 


.49 


.45 


1.6 


26 


.52 


.42 


1.5 


27 


.53 


.42 


1.5 


28 


.56 


.40 


11 


29 


5.3 


.42 


11 


30 


1.6 


.43 


6.0 


31 


.61 





4.5 


TOTAL 


14.27 


11.33 


172.50 


MEAN 


.46 


.38 


5.56 


MAX 


5.3 


.46 


30 


MIN 


.10 


.28 


.43 


AC-FT 


28 


22 


342 



110 



SAN LORENZO RIVER BASIN 



11160300 ZAYANTE CREEK AT ZAYANTE, CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1958 - 1993, BY WATER YEAR <WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


1.29 


3.50 


8.71 


29.9 


38.3 


27.3 


15.2 


5.04 


2.17 


1.22 


.76 


.75 


MAX 


15.8 


16.4 


49.1 


136 


214 


183 


100 


47.2 


8.77 


4.59 


2.46 


5.16 


(WY) 


1963 


1973 


1984 


1969 


1986 


1983 


1958 


1983 


1983 


1983 


1983 


1959 


MIN 


.21 


.38 


.76 


.86 


.81 


1.03 


.51 


.52 


.18 


.060 


.021 


.091 


(WY) 


1962 


1993 


1991 


1991 


1977 


1988 


1977 


1977 


1977 


1977 


1977 


1992 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN -DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



2154.45 
S.89 



WATER YEARS 1958 - 1993 



290 



Feb 12 

05 Sep 26 

06 Sep 22 



4270 
10 

1.0 
.12 



11.0 








43.3 






1983 


.61 






1977 


1690 


Jan 


4 


1982 


.00 


Jul 


17 


1961 


.00 


Sep 


2 


1961 


4620 


Jan 


14 


1978 


8.86 


Jan 


4 


1982 


6000 








17 








1.5 








.34 









SAN LORENZO RIVER BASIN 
11160430 BEAN CREEK NEAR SCOTTS VALLEY, CA 



111 



LOCATION. --Lat 37*03'19", long 122'02'25", in San Augustin Grant, Santa Cruz County, Hydrologic Unit 18060001, on 
right bank, 0.3 mi downstream from unnamed left bank tributary, 100 ft northeast of Mt. Hermon Road, 1.2 mi 
northwest of Scotts Valley Post Office, and 1.8 mi east of Felton. 



DRAINAGE AREA. --8. 81 mi'. 

PERIOD OF RECORD. — January 1989 to current year. 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage is 320 ft above sea level, from topographic 
map. 

REMARKS. — No estimated daily discharges. Records fair. No regulation; small diversions upstream from station 
for domestic use. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 1,190 ft^/s (revised), Feb. 14, 1992, gage height, 9.29 ft; 
minimum daily, 0.94 ft^/s, Jan. 31, 1992. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 200 ft^/s and maximum (*): 



Date 



Time 



Discharge 
(ft^/s) 



Jan. 6 2345 
Jan. 13 0345 



316 
494 



Gage height 
(ft) 

6.28 
6.92 



Date 



Jan . 20 
Feb. 18 



Time 



2030 
2000 



Discharge 
(ft^/s) 

389 
*67* 



Gage height 
(ft) 

6.56 
*7.49 



Minimum daily, 1.3 ff^/s, Dec. 5. 

REVISIONS. --The maximum discharges for some water years have been revised, as shown in the following table. 
They supercede figures published in WDR CA-89-2 through CA-92-2. 



Water 
year 

1989 
1990 
1991 
1992 



Date 

Mar. 9, 1989 

May 28, 1990 

Mar. 24, 1991 

Feb. 14, 1992 



Discharge 
(ft^/s) 



170 

86 

538 

1,190 



Gage Height 
(ft) 

5.65 
5.18 
7.10 
9.29 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


1.6 


1.7 


2.1 


55 


17 


55 


15 


4.7 


3.3 


2.5 


2.2 


2.4 


2 


1.6 


1.7 


4.0 


29 


12 


49 


13 


4.5 


3.2 


2.5 


2.3 


2.3 


3 


1.6 


1.7 


1.6 


18 


17 


43 


12 


4.8 


3.1 


2.5 


2.2 


2.3 


4 


1.6 


1.8 


1.5 


16 


16 


41 


11 


4.7 


6.0 


2.6 


2.3 


2.3 


5 


1.6 


1.8 


1.3 


16 


20 


41 


10 


4.4 


4.1 


2.6 


2.2 


2.3 


6 


1.6 


1.8 


16 


54 


14 


34 


9.4 


4.2 


3.7 


2.6 


2.2 


2.3 


7 


1.6 


1.8 


13 


129 


20 


32 


8.8 


4.1 


3.3 


2.6 


2.2 


2.3 


8 


1.6 


1.9 


9.6 


71 


20 


27 


8.3 


4.1 


3.2 


2.6 


2.2 


2.3 


9 


1.6 


1.9 


37 


44 


20 


27 


7.7 


4.0 


3.0 


2.5 


2.2 


2.3 


10 


1.6 


1.9 


43 


38 


23 


24 


7.4 


4.0 


3.0 


2.5 


2.2 


2.3 


11 


1.7 


1.9 


33 


31 


31 


19 


7.0 


4.0 


2.9 


2.5 


2.3 


2.3 


12 


1.7 


1.9 


19 


75 


22 


15 


6.7 


3.9 


3.0 


2.4 


2.3 


2.3 


13 


1.8 


2.0 


14 


276 


20 


14 


6.3 


3.8 


2.9 


2.4 


2.3 


2.4 


14 


1.8 


2.2 


13 


103 


21 


13 


6.2 


3.7 


2.8 


2.2 


2.3 


2.3 


IS 


1.8 


2.1 


10 


80 


26 


11 


6.2 


3.7 


2.9 


2.2 


2.3 


2.3 


16 


1.8 


2.2 


7.9 


85 


25 


10 


5.1 


3.6 


2.9 


2.2 


2.3 


2.3 


17 


1.8 


2.2 


9.3 


133 


57 


19 


20 


3.4 


2.8 


2.2 


2.3 


2.3 


18 


1.8 


2.1 


6.8 


148 


195 


11 


8.6 


3.3 


2.9 


2.2 


2.3 


2.3 


19 


1.7 


2.1 


6.4 


79 


226 


10 


6.9 


3.4 


2.8 


2.3 


2.3 


2.2 


20 


1.6 


2.1 


6.2 


236 


107 


9.2 


6.5 


3.4 


2.6 


2.2 


2.1 


2.2 


21 


1.8 


2.2 


6.1 


187 


67 


9.1 


6.1 


3.3 


2.5 


2.2 


2.2 


2.2 


22 


1.6 


2.2 


6.3 


140 


58 


8.8 


5.9 


3.2 


2.6 


2.3 


2.3 


2.2 


23 


1.6 


1.9 


6.3 


80 


72 


14 


5.9 


3.3 


2.7 


2.2 


2.3 


2.2 


24 


1.6 


1.9 


6.7 


87 


63 


18 


5.7 


5.1 


2.6 


2.2 


2.4 


2.2 


2S 


1.7 


1.9 


7.6 


55 


62 


15 


5.5 


4.4 


2.6 


2.2 


2.3 


2.1 


26 


1.7 


1.9 


6.7 


47 


96 


28 


5.2 


3.7 


2.6 


2.2 


2.3 


2.1 


27 


1.8 


2.0 


6.3 


52 


69 


24 


5.2 


3.7 


2.6 


2.2 


2.4 


2.2 


28 


1.8 


2.1 


23 


37 


64 


24 


5.0 


3.5 


2.6 


2.2 


2.3 


2.1 


29 


15 


2.0 


22 


30 





20 


4.8 


3.4 


2.5 


2.0 


2.4 


2.2 


30 


2.1 


2.0 


17 


28 





17 


4.8 


3.3 


2.6 


2.1 


2.5 


2.2 


31 


1.7 




13 


24 





17 





3.8 


""~~ 


2.0 


2.3 




TOTAL 


65.9 


58.9 


375.7 


2483 


1460 


699.1 


237.2 


120.4 


90.3 


72.1 


70.7 


67.7 


MEAN 


2.13 


1.96 


12.1 


80.1 


52.1 


22.6 


7.91 


3.88 


3.01 


2.33 


2.28 


2.26 


MAX 


15 


2.2 


43 


276 


226 


55 


20 


5.1 


6.0 


2.6 


2.5 


2.4 


MIN 


1.6 


1.7 


1.3 


16 


12 


8.8 


4.8 


3.2 


2.5 


2.0 


2.1 


2.1 


AC-FT 


131 


117 


745 


4930 


2900 


1390 


470 


239 


179 


143 


140 


134 



112 



SAN LORENZO RIVER BASIN 



11160430 BEAN CREEK NEAR SCOTTS VALLEY. CA- -Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1989 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR HAY JUH 



JUL 



AUG 



SEP 



MEAN 


2.39 


2.57 


5.37 


22.3 


23.1 


17.7 


4.62 


2.80 


2.37 


2.04 


1.97 


1.97 


MAX 


2.98 


4.10 


12.1 


80.1 


52.1 


32.0 


7.91 


3.88 


3.01 


2.33 


2.28 


2.26 


<WY) 


1990 


1990 


1993 


1993 


1993 


1991 


1993 


1993 


1993 


1993 


1993 


1993 


MIN 


1.95 


1.96 


2.15 


2.11 


2.42 


3.92 


2.62 


2.33 


1.96 


1.71 


1.84 


1.76 


(WY) 


1991 


1993 


1991 


1991 


1991 


1990 


1990 


1989 


1991 


1991 


1989 


1990 



SUhHARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 

2964.27 
8.10 



256 Feb 14 

.94 Jan 31 

1.0 Jan 21 



S880 
15 
2.3 
1.6 



FOR 1993 WATER YEAR 



WATER YEARS 1989 - 1993 



5801.0 






15.9 






276 


Jan 


13 


1.3 


Dec 


5 


1.6 


Oct 


1 


674 


Feb 


18 


7.49 


Feb 


18 


11510 






43 






3.3 






1.8 







7.79 








IS. 9 






1993 


3.00 






1990 


276 


Jan 


13 


1993 


.94 


Jan 


31 


1992 


1.0 


Jan 


21 


1992 


1190 


Feb 


14 


1992 


9.29 


Feb 


14 


1992 


5640 








12 








2.3 








1.8 









SAN LORENZO RIVER BASIN 

11160500 SAN LORENZO RIVER AT BIG TREES, CA 

LOCATION. --Lat 37'02'«0", long 122*04'17", in Zayante Grant, Santa Cruz County, Hydrologic Unit 18060001, on 
right bank 20 ft upstream from bridge on Henry Cowell State Park Road, 200 ft upstream from Shingle Mill 
Creek, 0.3 mi downstream from Zayante Creek, 0.9 mi northwest of Big Trees Station on Southern Pacific 
Railroad, and 5.3 mi northwest of Santa Cruz. 

DRAINAGE AREA.— 106 mi^. 



113 



WATER-DISCHARGE RECORDS 

PERIOD OF RECORD.— October 1936 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. 

REVISED RECORDS.— WSP 1315-B: 1938(M) . WSP 1715: Drainage area. 

GAGE. — Water-stage recorder and crest-stage gage. Datum of gage is 227.00 ft above sea level. Prior to Oct. 6, 
1972, at site 1.3 mi downstream at different datum. 

REMARKS. --No estimated daily discharges. Records good except for daily discharges from Oct. 1 to Jan. 13, which 
are fair. Low flow partially regulated by Loch Lomond Reservoir since 1961, capacity, 8,820 acre-ft, and by a 
fiber dam located 500 ft upstream from gage. Many small diversions upstream from station for domestic supply. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 30,«00 ft^/s. Dec. 23, 1955, gage height, 22.55 ft, site and 
datum then in use, from rating curve extended above 11,000 ft /s on basis of slope-area measurement of peak 
flow; maximum gage height, 28.85 ft, Jan. 5, 1982; minimum daily discharge, 5.6 ft^/s, July 27, 28, 1977. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,800 ft^/s and maximum (*): 



Date 


Time 


Discharge 
(ft^/s) 


Jan. 7 
Jan. 13 
Jan. 20 


0100 
0700 
2045 


2,090 

*6,430 

4,270 


Minimum 


daily. 


8.9 ft^/s, Oct 
DISCHARGE, CUB 



Gage height 
(ft) 

8.74 

*13.64 

11.52 



Date 



Time 



Feb. 18 2200 
Feb. 26 0545 



Discharge 
(ft^/s) 

3,920 
2,350 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



Gage height 
(ft) 

11.13 
9.14 



DAY 



OCT 



MOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


8.9 


14 


11 


494 


170 


498 


158 


62 


48 


27 


22 


17 


2 


9.3 


13 


23 


205 


147 


438 


135 


61 


43 


28 


21 


17 


3 


9.4 


12 


38 


111 


138 


395 


127 


64 


41 


27 


21 


17 


4 


10 


12 


15 


79 


130 


346 


125 


68 


57 


28 


21 


17 


S 


10 


12 


11 


63 


175 


314 


117 


64 


68 


28 


21 


17 


6 


10 


11 


219 


228 


129 


292 


112 


63 


56 


27 


20 


17 


7 


10 


11 


148 


1230 


152 


271 


108 


63 


52 


27 


20 


17 


8 


11 


11 


90 


585 


279 


249 


106 


64 


48 


27 


20 


19 


g 


11 


11 


395 


322 


254 


226 


105 


61 


45 


26 


21 


16 


10 


11 


11 


394 


287 


215 


213 


99 


57 


42 


26 


21 


15 


11 


13 


11 


313 


194 


386 


202 


96 


57 


42 


26 


21 


15 


12 


13 


12 


111 


369 


254 


189 


93 


57 


40 


26 


21 


15 


13 


12 


12 


71 


3540 


205 


181 


89 


56 


39 


26 


20 


16 


14 


12 


12 


50 


1320 


184 


175 


88 


55 


38 


25 


20 


17 


IS 


13 


12 


36 


769 


164 


162 


85 


53 


36 


24 


21 


17 


18 


13 


12 


32 


746 


160 


156 


83 


51 


37 


24 


21 


17 


17 


13 


12 


38 


1030 


611 


202 


158 


51 


36 


24 


20 


17 


18 


12 


12 


32 


1320 


1460 


163 


122 


48 


34 


24 


20 


16 


19 


11 


12 


27 


650 


2360 


148 


94 


49 


33 


23 


19 


15 


20 


11 


12 


27 


2250 


1540 


140 


87 


49 


33 


22 


19 


15 


21 


15 


13 


26 


1790 


807 


133 


81 


48 


33 


23 


19 


15 


22 


14 


14 


28 


1560 


639 


127 


78 


47 


33 


22 


18 


15 


23 


13 


12 


31 


747 


801 


145 


76 


46 


32 


23 


19 


15 


24 


12 


11 


31 


541 


709 


210 


78 


51 


31 


23 


18 


14 


25 


13 


11 


30 


421 


587 


157 


75 


62 


30 


24 


17 


14 


26 


13 


11 


29 


346 


1480 


236 


72 


55 


29 


25 


16 


14 


27 


12 


11 


28 


293 


763 


196 


70 


64 


29 


25 


16 


13 


28 


10 


11 


147 


258 


588 


188 


68 


50 


30 


24 


16 


13 


29 


160 


11 


168 


234 





161 


65 


46 


29 


24 


16 


14 


30 


51 


11 


92 


211 





150 


63 


45 


27 


23 


17 


14 


31 


20 





68 


188 





144 





56 





22 


17 





TOTAL 


556.6 


353 


2759 


22381 


15487 


6807 


2913 


1723 


1171 


773 


599 


470 


MEAN 


18.0 


11.8 


89.0 


722 


553 


220 


97.1 


55.6 


39.0 


24.9 


19.3 


15.7 


MAX 


160 


14 


395 


3540 


2360 


498 


158 


68 


68 


28 


22 


19 


MIN 


8.9 


11 


11 


63 


129 


127 


63 


45 


27 


22 


16 


13 


AC-FT 


1100 


700 


5470 


44390 


30720 


13500 


5780 


3420 


2320 


1530 


1190 


932 



114 



SAN LORENZO RIVER BASIN 



11160500 SAN LORENZO RIVER AT BIG TREES, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1937 



OCT 



NOV 



DEC 



JAM 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


23.4 


5*. 9 


153 


306 


389 


295 


179 


70.1 


39.7 


26.1 


19.7 


18.0 


MAX 


176 


461 


1319 


1242 


1532 


1483 


1005 


322 


112 


65.8 


44.0 


52.1 


(WY) 


1963 


1951 


1956 


1952 


1986 


1983 


1958 


1983 


1983 


1983 


1983 


1959 


MIN 


6.26 


11.4 


14.7 


13.8 


16.6 


21.4 


12.3 


11.6 


9.37 


6.66 


6.50 


8.28 


(WY) 


1978 


1991 


1991 


1991 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1991 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1937 



1993 



25928.5 






55992.6 








70.8 






1S3 




130 
391 
13.2 


1983 
1977 


2960 


Feb 


12 


3540 


Jan 13 


17000 


Dec 23 1955 


7.9 


Sep 


26 


8.9 


Oct 1 


5.6 


Jul 27 1977 


8.1 


Sep 


24 


9.7 


Oct 1 


5.8 


Jul 26 1977 








6430 


Jan 13 


30400 


Dec 23 1955 








13.64 


Jan 13 


28.85 


Jan 5 1982 


51430 






111100 




94030 




147 






346 




267 




19 






37 




32 




9.5 






12 




13 





SAN LORENZO RIVER BASIN IIS 

11160500 SAN LORENZO RIVER AT BIG TREES, CA— Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1906-07, 1952-82, 1986, November 1989 to May 1993 (discontinued). 
CHEMICAL DATA: Water years 1906-07, 1952-67, 1969-70, 1973-75, 1977, 1980-81. 
WATER TEMPERATURE: Water years 1966-82. 
SEDIMENT DATA: Water years 1973-82, 1986, November 1989 to May 1993 (discontinued). 

PERIOD OF DAILY RECORD.— 

WATER TEMPERATURE: May 1966 to February 1979. 
SUSPENDED-SEDIMENT DISCHARGE: October 1972 to September 1982. 

REMARKS. --Zero bedload discharge observed for flows less than 175 ft^/s during current year. Sediment loads at 
times affected by fiber dam upstream. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 



DIS- 






SEDI- 


SED. 


SED. 


SED. 


CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 


INST. 




SEDI- 


DIS- 


FALL 


FALL 


FALL 


CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 


FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


X FINER 


Z FINER 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 


SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.002 m 


.004 hW 


.008 m 



NOV 

03. 
DEC 

01. 

09. 
JAN 

04. 

13. 
FEB 

01. 
MAR 

02. 
APR 

02. 
MAY 

04. 



DATE 



1230 



12 



15.5 



0.19 



1445 


11 


8.5 


4 


0.12 


— 


— 


— 


1305 


545 


12.5 


448 


659 


— 


— 


— 


1405 


73 


5.5 


12 


2.4 


-- 


-- 


-- 


1440 


2860 


12.0 


1620 


12500 


14 


19 


27 


1150 


175 


9.0 


32 


15 


— 


— 


— 


1505 


431 


10.0 


28 


33 


— 


— 


— 


1415 


136 


12.5 


7 


2.6 


— 


— 


— 


1430 


66 


15.0 


3 


0.53 


— 


— 


— 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


FALL 


FALL 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


016 m 


.031 m 


.062 VK 


.125 m 


.250 Hi 


.500 ^W 


1.00 m 


2.00 m 



NOV 

03. .. 
DEC 

01. 

09. 
JAN 

04. 

13. 
FEB 

01. 
MAR 

02. 
APR 

02. 
MAY 

04. 



35 



46 



78 

59 
26 

58 
56 

84 

69 

86 

84 



30 



68 



44 



79 



9S 



92 



100 



99 



100 



116 



SAN LORENZO RIVER BASIN 



11160500 SAN LORENZO RIVER AT BIG TREES, CA--Continued 
PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 









DIS- 




BED 


BED 


BED 


BED 






NUMBER 


CHARGE, 




MAT. 


MAT. 


MAT. 


MAT. 






OF 


INST. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 






SAM- 


CUBIC 


TEMPER- 


DIAM. 


DIAM. 


DIAM. 


DIAM. 






PLING 


FEET 


ATURE 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE TIME 


POINTS 


PER 


WATER 


THAN 


THAN 


THAN 


THAN 






(COUNT) 


SECOND 


(DEG C) 


.062 h« 


.125 m 


.250 W 


.500 m 


NOV 


















03.. 


1512 




12 


15.5 




31 


76 


97 


03.. 


1515 




12 


15.5 




6 


14 


28 


03.. 


1520 




12 


15.5 




5 


67 


93 


03.. 


1525 




12 


15.5 




3 


34 


62 


03.. 


1530 




12 


15.5 




2 


6 


8 


03.. 


1543 




12 


15.5 




1 


4 


6 


03.. 


1545 




12 


15.5 


2 


e 


24 


44 


JAN 


















04.. 


1428 




73 


5.5 


8 


30 


74 


95 


04.. 


1430 




73 


5.5 


— 


— 


— 


12 


04.. 


1433 




73 


5.5 


— 


— 


1 


16 


04.. 


1438 




73 


5.5 


— 


— 


— 


4 


04.. 


1443 




73 


5.5 


— 


— 


— 


4 


04.. 


1445 




73 


5.5 


— 


— 


— 


3 


04.. 


1449 




73 


5.5 


3 


8 


30 


66 


MAY 


















04.. 


1455 




66 


15.0 


8 


31 


64 


94 


04.. 


1456 




66 


15.0 


1 


4 


15 


22 


04.. 


1457 




66 


15.0 


— 


1 


7 


24 


04.. 


1458 




66 


15.0 


-- 


— 


1 


6 


04.. 


1459 




66 


15.0 


-- 


— 


2 


8 


04.. 


1500 




66 


15.0 


1 


2 


6 


9 


04.. 


1501 




66 


15.0 


1 


3 


19 


57 




BED 


BED 


BED 


BED 


BED 


BED 


BED 


BED 




MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




1 FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DAI 


rE THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 



NOV 

03. 

03. 

03. 

03. 

03. 

03. 

03. 
JAN 

04. 

04. 

04. 

04. 

04. 

04. 

04. 
MAY 

04. 

04. 

04. 

04. 

04. 

04. 

04. 



1.00 h« 2.00 m 4.00 m 8.00 f^l 16.0 »1 32.0 m 64.0 »1 128 ^w 



100 
S3 
97 
77 
10 
10 
57 

99 
52 
60 
21 
20 
19 
92 

100 
39 
35 
19 
26 
18 
79 



76 
98 
85 
13 
20 
70 

99 
83 
80 
46 
34 
43 
98 



83 
48 
30 
40 
SO 
91 



88 
99 
90 
18 
29 
83 

100 
96 
88 
64 
48 
62 
99 



99 
64 
42 
SS 
73 
96 



95 
100 
92 
26 
38 
91 



99 
94 
76 
65 
80 
100 



100 
82 
S3 
72 
69 
99 



98 

96 
39 
52 
96 



100 
99 
8S 
84 
90 



92 
66 
82 
98 
100 



100 

100 
82 
76 

100 



100 

88 

100 

100 



100 

76 

100 

100 



100 
100 



100 



79 



100 



PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



SAM- 
PLING 
TIME METHOD . 
CODES 



JAN 

13. 
MAR 

02. 

02. 



1605 



1210 
1305 



1000 



1000 
1000 













TIME 


HORI- 




BAG 


TETHER 






ON BED 


ZONTAL 




MESH 


LINE 


START- 


END- 


FOR 


WIDTH 




SIZE 


USED IN 


ING 


ING 


BED 


OF 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


TYPE 


SAMPLER 


(YES=1) 


(2400 


(2400 


SAMPLE 


TICAL 


(CODE) 


tm) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 



1140 



1100 
1100 



0.250 



0.250 
0.250 



1550 



1200 
1246 



1620 



1225 
1326 



10 



20 
20 



4.0 



2.0 
2.0 



SAN LORENZO RIVER BASIN 



117 



11160500 SAN LORENZO RIVER AT BIG TREES, CA— Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





COMPSTD 


VER- 




SAMPLE 


DIS- 




DISCH, 


SEDI- 


SED. 




SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE, 




BEDLOAD 


MENT 


BEDLOAD 




IN 


IN 


OF 


ATION, 


INST. 




AV UNIT 


DIS- 


SIEVE 




X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 


DIAM. 




BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 


Z FINER 


DATE 


MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(TONS/ 


THAN 




(NUM) 


(NUM) 


(COUNT) 


L BANK) 


SECOND 


(DEG C) 


T/D/FT 


DAY) 


.125 m 


JAM 




















13... 


1 


21 


21 


14.0 


3240 


12.0 


2.39 


201 


1 


MAR 




















02... 


2 


29 


29 


5.00 


441 


10.0 


2.89 


170 


— 


02... 


2 


29 


29 


5.00 


441 


10.0 


2.97 


170 







SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 




BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




X FINER 


X FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 




.250 m 


.500 m 


1.00 m 


2.00 m 


4.00 m 


8.00 »1 


16.0 m 


32.0 m 


64.0 m 


JAN 




















13... 


6 


34 


64 


77 


83 


86 


90 


96 


100 


MAR 




















02... 


1 


11 


43 


74 


89 


96 


98 


100 


— 


02... 


1 


9 


37 


69 


87 


95 


99 


100 


— 



116 



SAN LORENZO RIVER BASIN 
11161000 SAN LORENZO RIVER AT SANTA CRUZ, CA 



LOCATION. --Lat 36"59*27", long 122'01'51", in La Carbonera Grant, Santa Cruz County, Bydrologic Unit 18060001, 
on right bank, in city of Santa Cruz Water Meter Repair compound, 0.3 ml upstream from Intersection of State 
Highways 1 and 9, 1.0 mi north of Santa Cruz, and 2.4 ml upstream from mouth. 

DRAINAGE AREA." 115 ml^. 

PERIOD OF RECORD. --October 1952 to September 1960, October 1987 to current year. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 5.84 ft (revised) above sea level (levels by 
city of Santa Cruz Water Department). October 1952 to September 1960, water-stage recorder at site 0.1 mi 
downstrecus at different datum. 

REMARKS. — Records fair. Low flow partially regulated by Loch Lomond Reservoir since 1961, capacity, 

8,820 acre-ft, and by a fiber dam located 6.8 ml upstream from gage. Water is diverted 50 ft upstream from 

station by city of Santa Cruz for municipal supply; many small diversions upstream from station for domestic 
supply . 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 30,400 ft^/s Dec. 23. 1955, gage height, 23.10 ft, site and 
datum then in use, from rating curve extended above 4.500 ft /s on basis of slope-area measurement of peak 
flow; no flow for several days in 1955 and many days in 1960. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1.800 ft'/s and maximum (*), from 
rating curve extended above 2,500 ft /s by comparison to station at Big Trees: 



Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Jan. 7 
Jan. 13 


0300 
0800 


2,190 
*7,070 


9.02 
*12.57 


Jan. 20 
Feb. 18 
Feb. 26 


2230 
2245 
0700 


4,900 
4,420 
2,550 


11.34 

11.01 

9.40 



Minimum daily, 0.28 ft^/s, Oct. 13. 



DAY 



CCT 



DISCHARGE , 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


2.2 


18 


4.5 


436 


192 


599 


el65 


72 


45 


21 


13 




9.4 


2 


3.1 


10 


8.0 


223 


180 


486 


el52 


69 


40 


21 


13 




9.2 


3 


3.4 


8.1 


47 


126 


174 


430 


145 


70 


38 


22 


12 




eg. 2 


4 


3.0 


5.0 


20 


88 


169 


367 


141 


71 


50 


22 


12 




e9.1 


5 


2.3 


2.6 


8.5 


65 


193 


326 


138 


67 


65 


21 


12 




e9.0 


6 


2.0 


4.1 


150 


135 


167 


300 


136 


67 


52 


22 


12 




e8.9 


7 


.46 


2.6 


207 


1320 


170 


279 


132 


65 


49 


21 


12 




e8.8 


8 


1.5 


2.6 


80 


587 


265 


258 


130 


63 


46 


20 


11 




e8.7 


9 


1.5 


3.2 


379 


287 


242 


240 


129 


61 


43 


21 


12 




e8.6 


10 


1.4 


3.0 


332 


257 


224 


224 


125 


58 


40 


21 


11 




eS.S 


11 


.30 


2.4 


358 


187 


319 


212 


122 


58 


38 


21 


11 




e8.4 


12 


.54 


2.8 


117 


261 


242 


202 


120 


57 


37 


21 


12 




e8.3 


13 


.28 


3.5 


83 


3820 


209 


191 


117 


56 


36 


20 


11 




e8.2 


14 


1.5 


3.3 


53 


1520 


198 


183 


116 


54 


35 


20 


11 




eS.l 


15 


.75 


3.2 


26 


700 


186 


173 


114 


53 


33 


18 


11 




e8.0 


16 


1.8 


3.5 


22 


806 


180 


168 


111 


50 


33 


18 


12 




e7.9 


17 


2.6 


5.8 


27 


1100 


518 


214 


166 


49 


33 


17 


11 




e7.8 


18 


2.8 


3.1 


24 


1620 


1510 


178 


141 


47 


31 


18 


11 




7.7 


19 


2.4 


2.8 


19 


677 


2690 


159 


104 


48 


29 


17 


10 




8.1 


20 


1.1 


4.3 


17 


2430 


1710 


154 


97 


46 


29 


17 


10 




7.4 


21 


3.9 


3.8 


18 


2180 


964 


148 


94 


45 


29 


17 


10 




7.5 


22 


2.6 


4.0 


17 


1870 


755 


145 


89 


42 


28 


16 


10 




7.4 


23 


1.6 


4.8 


26 


740 


932 


155 


91 


41 


27 


16 


10 




7.4 


24 


1.7 


3.8 


25 


465 


848 


227 


91 


44 


26 


15 


9. 


9 


7.4 


25 


1.7 


3.5 


27 


366 


678 


170 


85 


58 


25 


16 


9. 


5 


6.9 


26 


2.1 


3.6 


27 


308 


1640 


246 


82 


47 


25 


16 


9. 


3 


7.1 


27 


2.7 


3.8 


26 


272 


1000 


202 


79 


57 


25 


16 


9. 


5 


6.6 


28 


2.6 


2.8 


107 


249 


746 


199 


77 


48 


24 


16 


9. 


1 


6.4 


29 


161 


4.3 


179 


235 





173 


74 


44 


23 


15 


9. 





6.9 


30 


85 


5.1 


110 


219 





el64 


73 


42 


22 


14 


9. 


2 


6.6 


31 


31 





79 


205 





el57 





48 





14 


g. 


3 





TOTAL 


330.83 


133.4 


2623.0 


23754 


17301 


7329 


3436 


1697 


1056 


570 


334. 


8 


239.5 


MEAN 


10.7 


4.45 


84.6 


766 


618 


236 


115 


54.7 


35.2 


18.4 


10. 


8 


7.98 


MAX 


161 


18 


379 


3820 


2690 


599 


166 


72 


65 


22 


13 


9.4 


MIN 


.28 


2.4 


4.5 


65 


167 


145 


73 


41 


22 


14 


9. 





6.4 


AC-FT 


656 


265 


5200 


47120 


34320 


14540 


6820 


3370 


2090 


1130 


664 


475 


e Estimated. 



























SAN LORENZO RIVER BASIN 
11161000 SAN LORENZO RIVER AT SANTA CRUZ, CA- -Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1953 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



119 



SEP 



MEAH 13.4 21.1 


171 


226 


294 


180 


135 


54.6 


26 


.5 


13.2 


7.65 


8.75 


IttX 28.9 38.8 


1366 


822 


1254 


728 


1017 


138 


70 


.0 


45.0 


30.0 


40.4 


(Iff) 1990 19SS 


1956 


1956 


1958 


1958 


1958 


1958 


1958 


1958 


1958 


1959 


HIH 1.83 3. 45 


7.30 


5.60 


15.3 


16.8 


15.9 


13.7 


4.1 


54 


1.48 


.27 


.17 


(WY) 1989 1991 


1991 


1991 


1991 


1988 


1990 


1988 


1988 


1988 


1960 


1960 


SUmARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 






WATER YEARS 1953 - 


1993 


ANNUAL TOTAL 




24949.05 






58804.53 














ANNUAL MEAN 




68.2 






161 








04.9 






HIGHEST ANNUAL MEAN 


















293 




1958 


LOWEST ANNUAL MEAN 


















21.5 




1988 


HIGHEST DAILY MEAN 




3390 


Feb 12 




3820 


Jan 13 






17400 


Dec 23 


1955 


LOWEST DAILY MEAN 




.28 


Oct 13 




.28 


Oct 13 






.00 


Sep 3 


1955 


ANNUAL SEVEN-DAY MINIMUM 




.79 


Sep 15 




.85 


Oct 7 






.00 


Sep 20 


1960 


INSTANTANEOUS PEAK FLOW 










7070 


Jan 13 






30400 


Dec 23 


1955 


INSTANTANEOUS PEAK STAGE 










12.57 


Jan 13 






23.10 


Dec 23 


1955 


ANNUAL RUNOFF (AC-FT) 




49490 






116600 








68770 






10 PERCENT EXCEEDS 




139 






322 








190 






50 PERCENT EXCEEDS 




14 






33 








20 






90 PERCENT EXCEEDS 




1.7 






3.2 








2.0 







120 



SAN LORENZO RIVER BASIN 
11161300 CARBONERA CREEK AT SCOTTS VALLEY, CA 



LOCATION. --Lat 37*03'02", long IZa'DO'^S" in San Augustin Grant, Santa Cruz County, Hydrologic Unit 18060001, on 
right bank at east city limits of Scotts Valley, 1.1 mi upstream from Glen Canyon Road, 3.3 mi east of Felton, 
and 4.1 ml upstream from Branciforte Creek. 

DRAINAGE AREA.— 3.60 mi^. 

PERIOD OF RECORD. — February 1985 to current year. 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage is 550 ft above sea level, from topographic 
map. 

REMARKS. --Records fair except for estimated daily discharges, which are poor. No regulation or diversion 

upstream from station. Low flows affected by return flow from urban irrigation and by periodic flushing of 
upstreeuD county well. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 1,090 ft^/s, Feb. 14, 1992, gage height, 10.05 ft, from rating 
curve extended above 330 ft /s on basis of slope-area measurement at gage-height 9. AS ft; no flow for many 
days in each year. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 500 ff'/s and maximum (*): 



Discharge 
(ft^/s) 



Date Time 
Jan. 6 2145 559 

No flow for many days . 



Gage height 
(ft) 

7.81 



Date 
Feb. 18 



Time 
1815 



Discharge 
(ft^/s) 



•695 



Gage height 
(ft) 

•8.43 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 




.00 


e.l9 


e.05 


66 


4.5 


8.6 


e2.4 


.74 


.49 


e.06 


e.06 


e.05 


2 




.20 


e.l4 


e.50 


12 


4.5 


7.3 


e2.2 


.69 


.35 


e.06 


e.06 


e.09 


3 




.02 


e.ll 


e.lO 


6.7 


4.1 


6.6 


e2.0 


1.1 


.34 


e.07 


e.06 


.13 


A 




.00 


e.09 


e.lO 


4.7 


3.8 


5.4 


el. 9 


.99 


4.1 


e.08 


e.06 


.05 


5 




.00 


e.09 


e.lO 


3.4 


10 


4.7 


el. 8 


.77 


1.1 


e.09 


e.l4 


.03 


6 




.00 


e.08 


elO 


79 


4.4 


4.4 


el. 7 


.70 


.64 


e.og 


e.07 


.07 


7 




.00 


e.08 


e20 


82 


11 


4.3 


el. 6 


.71 


.39 


e.l2 


e.06 


e.02 


8 




.00 


e.07 


17 


28 


11 


3.7 


el. 6 


.63 


.33 


e.lO 


e.06 


e.Ol 


9 




.00 


e.07 


34 


21 


11 


3.5 


el. 5 


.60 


.29 


e.l2 


e.06 


e.02 


10 




.00 


e.07 


37 


17 


9.5 


3.3 


el. 4 


.59 


.24 


e.l3 


e.06 


e.l8 


11 




.00 


e.06 


13 


12 


22 


2.8 


el. 4 


.68 


.26 


e.l2 


e.05 


e.Ol 


12 




.00 


e.06 


4.4 


85 


9.2 


e2.3 


el. 3 


.61 


.23 


e.l3 


e.05 


e.Ol 


13 




.00 


.07 


2.8 


163 


7.2 


e2.1 


el. 3 


.55 


.20 


.17 


e.05 


e.Ol 


14 




.00 


.06 


2.0 


40 


6.1 


e2.4 


el. 2 


.56 


.20 


e.l3 


e.05 


e.04 


IS 




.00 


.06 


1.4 


41 


5.3 


e2.0 


el. 2 


.50 


.19 


e.lO 


e.05 


.10 


16 




.00 


.11 


1.1 


23 


5.9 


el. 9 


el. 4 


.49 


.18 


e.l4 


e.07 


.10 


17 




.00 


.12 


4.5 


102 


39 


7,9 


e7.8 


.46 


.16 


e.09 


e.07 


.07 


18 




.00 


.12 


1.2 


63 


135 


e2.8 


e2.3 


.54 


.20 


e.og 


e.05 


.10 


19 




.00 


.17 


.92 


21 


68 


e2.4 


el. 5 


.59 


.14 


e.og 


e.04 


.06 


20 




.04 


.09 


.83 


172 


25 


e2.3 


el. 3 


.60 


.15 


e.og 


e.04 


.04 


21 


2 


.3 


.04 


.75 


82 


14 


e2.2 


el. 2 


.47 


e.l2 


e.og 


e.04 


.05 


22 




.17 


1.1 


.67 


42 


14 


el. 9 


el.l 


.86 


e.lO 


e.07 


e.03 


.07 


23 




.10 


.12 


.67 


19 


20 


e3.5 


el.l 


.95 


e.lO 


e.07 


e.03 


.06 


24 




.00 


.04 


.67 


13 


12 


e7.0 


1.4 


4.4 


e.lO 


e.07 


e.03 


.09 


23 




.08 


.04 


.66 


11 


18 


eS.6 


1.0 


1.1 


e.08 


e.07 


e.03 


.04 


26 




.11 


e.04 


.59 


9.3 


41 


el2 


.95 


.96 


e.08 


e.07 


e.03 


e.02 


27 




.30 


e.04 


.70 


7.9 


15 


elO 


1.0 


.79 


e.07 


e.08 


e.03 


e.Ol 


28 




.45 


e.04 


28 


6.8 


11 


e6,0 


.88 


.52 


e.07 


e.08 


e.03 


.01 


29 


elO 




e.04 


17 


6.0 





e3.5 


.77 


.49 


e.07 


e.07 


e.03 


e.OO 


30 


el 


.0 


e.04 


6.7 


5.4 





e2.4 


.76 


.45 


e.06 


e.07 


e.03 


e.Ol 


31 


e 


.25 





4.3 


5.0 





e2.7 





1.5 





e.07 


e.lO 





TOTAL 


15 


.02 


3.45 


211.71 


1249.2 


541.5 


137.5 


48.96 


25.59 


11.03 


2.88 


1.62 


1.55 


MEAN 




.48 


.11 


6.83 


40.3 


19.3 


4.44 


1.63 


.83 


.37 


.093 


.052 


.052 


MAX 




10 


1.1 


37 


172 


135 


12 


7.8 


4.4 


4.1 


.17 


.14 


.18 


MIN 




.00 


.04 


.05 


3.4 


3.8 


1.9 


.76 


.45 


.06 


.06 


.03 


.00 


AC-FT 




30 


6.8 


420 


2480 


1070 


273 


97 


51 


22 


5.7 


3.2 


3.1 


a Estimated. 

























SAN LORENZO RIVER BASIN 



121 



11161300 CARBONERA CREEK AT SCOTTS VALLEY, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1985 
OCT NOV DEC JAN FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JVL 



AUG 



SEP 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



.70 1.55 

3.01 4.86 

1990 1989 

.039 .002 

1987 1987 



SUW1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



4.71 


8.95 


16.5 


11.2 


1.14 


.71 


.18 


.051 


.13 


.18 


10.9 


40.3 


63.9 


32.0 


1.89 


3.22 


.37 


.21 


.91 


.68 


1989 


1993 


1986 


1986 


1986 


1990 


1993 


1989 


1989 


1989 


.51 


.35 


.95 


.25 


.41 


.099 


.002 


.005 


.000 


.000 


1987 


1991 


1988 


1988 


1987 


1987 


1987 


1990 


1985 


1992 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



1303.37 






2250.01 






3.56 






6.16 






199 


Feb 


14 


172 


Jan 


20 


.00 


Jun 


8 


.00 


Oct 


1 


.00 


Jun 


18 


.00 


Oct 


4 








695 


Feb 


18 








8.43 


Feb 


18 


2590 






4460 






4.5 






13 






.16 






.49 






.00 






.03 







WATER YEARS 1985 - 1993 



3.80 
10.1 1986 

1.33 1990 

352 Feb 17 1986 
.00 Jun 28 1985 
.00 Jun 28 1985 
1090 Feb 14 1992 
10.05 Feb 14 1992 
2750 
4.9 
.24 
.00 



122 



PESCADERO CREEK BASIN 
11162500 PESCADERO CREEK NEAR PESCADERO. CA 



LOCATION. --Lat 37'15'39". long 122*19'40", in SW l/« sec. 5, T.8 S., R.4 W. , San Mateo County, Hydrologic Unit 
16050006, on left bank at dovmstream side of highway bridge, 3.0 mi east of Pescadero, and S.3 mi upstream 
from mouth. 

DRAINAGE AREA. --45. 9 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. --April 1951 to current year. 

REVISED RECORDS. --WSP 1445: 1952-53(M). WSP 1715: Drainage area. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 62.3 ft above sea level. 

REMARKS. --Records fair except for those for estimated dally discharges and for May 11 to June 11 and July 28 to 
Sept. 2, which are poor. Minor regulation from swimming pools in San Mateo County Memorial Park and Portola 
State Park during suraner months. Small diversions upstream from station by pumping. 



EXTREMES FOR PERIOD OF RECORD, 
curve extended above 2,700 ft 



Maximum discharge, 9,420 ft^/s, Dec. 23, 1955, gage height, 21.27 ft, from rating 
/s on basis of slope-area measurement of peak flow; no flow at times. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 700 ft^/s and maximum (*): 



Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Date 


Time 


Discharge 
(ft^/s) 


Jan. 13 
Jan. 20 


0815 
2245 


*5,060 
1,600 


*15.33 
9.03 


Feb. 19 
Feb. 26 


2400 
0630 


1,800 
892 



Gage height 
(ft) 

9.04 
6.95 



Minimum dally, 0.60 ft^/s, Oct. 13. 



DISCHARGE, 



DAY 



(XT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


■ .67 


1.1 


2.8 


207 


13 


192 


69 


17 


12 


6.4 


3.5 


3.3 


2 


a. 65 


.91 


4.2 


109 


9.8 


164 


62 


16 


10 


6.1 


3.4 


e2.e 


3 


■ .65 


1.1 


11 


55 


7.7 


140 


59 


16 


9.7 


6.1 


3.2 


e2.8 


4 


■ .64 


1.2 


8.8 


37 


6.1 


117 


55 


17 


11 


6.1 


2.9 


2.7 


5 


■ .64 


1.2 


5.3 


28 


5.5 


104 


53 


15 


17 


6.1 


3.2 


2.6 


6 


■ .64 


1.4 


24 


28 


3.9 


95 


51 


14 


15 


6.1 


3.3 


2.6 


7 


■ .63 


1.5 


48 


315 


4.3 


88 


48 


14 


13 


6.1 


4.4 


2.7 


8 


■ .62 


1.5 


11 


244 


14 


62 


43 


14 


12 


5.8 


3.8 


2.8 


9 


■ .62 


1.5 


41 


129 


37 


76 


44 


13 


9.3 


5.8 


3.5 


2.8 


10 


■ .62 


1.9 


89 


98 


22 


73 


43 


13 


10 


5.7 


4.4 


3.0 


11 


■ .61 


1.6 


111 


72 


22 


69 


41 


13 


10 


5.4 


3.9 


3.0 


12 


■ .61 


1.5 


40 


60 


16 


65 


39 


11 


9.6 


5.3 


3.6 


3.1 


13 


■ .60 


1.5 


22 


2460 


12 


62 


38 


11 


9.2 


5.1 


3.8 


3.2 


14 


.63 


1.5 


15 


930 


7.5 


60 


37 


12 


9.1 


5.1 


3.5 


3.0 


IS 


.61 


1.5 


10 


300 


6.2 


56 


37 


12 


8.7 


5.1 


3.1 


3.0 


16 


.72 


1.5 


7.9 


290 


4.5 


54 


34 


11 


8.7 


5.1 


3.1 


3.0 


17 


.74 


1.6 


9.9 


322 


11 


54 


38 


11 


8.6 


5.1 


3.5 


3.0 


18 


.81 


1.7 


14 


441 


138 


e51 


40 


11 


7.9 


4.8 


2.6 


3.0 


19 


.86 


2.1 


8.9 


241 


844 


e47 


31 


11 


7.9 


4.2 


2.5 


e2.9 


20 


.97 


2.2 


7.0 


575 


924 


e42 


28 


11 


7.4 


4.4 


2.7 


e2.9 


21 


1.1 


2.3 


6.1 


666 


370 


e40 


26 


11 


7.2 


4.5 


2.6 


e2.9 


22 


1.3 


2.7 


5.5 


590 


273 


e37 


24 


11 


7.1 


4.2 


2.7 


e2.8 


23 


1.6 


2.8 


5.0 


250 


355 


e45 


24 


10 


6.8 


4.3 


2.1 


e2.8 


24 


1.4 


3.0 


4.5 


156 


333 


76 


25 


12 


6.8 


4.5 


2.0 


e2.8 


25 


1.1 


3.0 


4.2 


108 


229 


63 


22 


13 


6.4 


4.4 


2.6 


e2.7 


26 


.96 


2.7 


3.5 


75 


517 


93 


21 


13 


6.4 


4.2 


2.7 


e2.7 


27 


1.0 


2.6 


3.5 


56 


306 


84 


20 


19 


6.4 


4.2 


2.5 


e2.7 


28 


1.0 


2.6 


23 


42 


235 


88 


19 


15 


6.4 


4.3 


2.8 


e2.7 


29 


8.0 


2.6 


89 


30 





78 


18 


12 


6.4 


3.8 


2.5 


e2.6 


30 


12 


2.7 


75 


25 





71 


18 


11 


6.4 


3.8 


2.8 


e2.e 


31 


1.9 





51 


18 





67 





13 





3.6 


3.2 





TOTAL 


44.90 


57.01 


761.1 


8957 


4726.5 


2433 


1107 


403 


272.4 


155.7 


96.5 


85.3 


MEAN 


1.45 


1.90 


24.6 


289 


169 


78.5 


36.9 


13.0 


9.08 


5.02 


3.11 


2.84 


MAX 


12 


3.0 


111 


2460 


924 


192 


69 


19 


17 


6.4 


4.4 


3.3 


MIN 


.60 


.91 


2.8 


18 


3.9 


37 


18 


10 


6.4 


3.6 


2.0 


2.6 


AC-FT 


89 


113 


1510 


17770 


9380 


4830 


2200 


799 


540 


309 


191 


169 


e Es 


timated. 

























PESCADERO CREEK BASIN 



123 



11162500 PESCADERO CREEK NEAR PESCADERO. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 
OCT NOV DEC JAM FEB 



1993. BY WATER YEAR (WY) 
MAR APR MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


5.73 


13.8 


59.2 


112 


116 


91.1 


56.3 


17.7 


8.29 


4.67 


3.25 


2.52 


MAX 


92.8 


85.9 


469 


418 


476 


540 


398 


93.8 


28.1 


14.8 


10.5 


7.79 


(WY) 


1963 


1984 


1956 


1952 


1983 


1983 


1958 


1983 


1983 


1983 


1969 


1983 


MIN 


.38 


1.61 


2.30 


2.75 


2.92 


4.25 


1.93 


2.00 


.78 


.20 


.012 


.083 


(WY) 


1962 


1992 


1977 


1991 


1977 


1988 


1977 


1977 


1977 


1977 


1977 


1977 



SUMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1951 - 1993 



10224.61 






19099.41 








27.9 






52.3 




40.6 
164 
1.72 


1983 
1977 


1650 


Feb 


12 


2460 


Jan 13 


5560 


Dec 23 1955 


.55 


Sep 


17 


.60 


Oct 13 


.00 


Sep 9 1961 


.60 


Sep 


24 


.61 


Oct 9 


.00 


Aug 17 1977 








5060 


Jan 13 


9420 


Dec 23 1955 








15.33 


Jan 13 


21.27 


Dec 23 1955 


20280 






37880 




29400 




56 






96 




84 




3.6 






7.9 




6.6 




.75 






1.5 




1.3 





12* PESCADERO CREEK BASIN 

11162500 PESCADERO CREEK NEAR PESCADERO. CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1965-80. 1986. December 1989 to May 1993 (discontinued). 
CHEMICAL DATA: Water year 1977. 
WATER TEMPERATURE: Water years 1965-80. 
SEDIMENT DATA: Water years 1971, 1973, 1980, 1986, December 1989 to May 1993 (discontinued). 

PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: April 1965 to February 1979. 
SUSPENDED-SEDIMENT DISCHARGE: December 1979 to September 1980. 

REMARKS. --Zero bedload discharge observed for flows less than 15 ft /s during current year. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR CXTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 



DIS- 
CHARGE, 
INST. 



FEET 
PER 



ATURE 
WATER 



SEDI- 



CUBIC TEMPER- MENT, 



SEDI- 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


MENT, 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP 


DIS- 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 



CHARGE, 
SUS- SUS- 
PENDED PENDED 



DIAM. 



DIAM. 



DIAM. 



DIAM. 



DIAM. 



DIAM. 



^ FINER Z FINER 1 FINER Z FINER I FINER Z FINER 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



SECOND (DEG C) (MG/L) (T/DAY) .062 m . 125 ^W .250 t*i .500 htl 1.00 m 2.00 »I 



NOV 

18.. 
DEC 

11.. 

1*.. 
JAN 

14.. 
FEB 

19.. 
MAR 

17.. 
MAY 

11.. 



1320 



1.7 



1240 


82 


1320 


15 


1500 


685 


1655 


631 


1420 


55 


1450 


14 



10.5 



0.01 



11.5 


179 


40 


7.5 


11 


0,45 


10.5 


1280 


2370 


11.5 


691 


1180 


13.5 


15 


2.2 


14.0 


8 


0.30 



64 

78 
88 

56 

78 

87 



80 

67 
84 



92 

81 
92 



100 

93 

98 



98 
100 



100 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 





DIS- 




BED 


BED 


BED 


BED 


NUMBER 


CHARGE, 




MAT. 


MAT. 


MAT. 


MAT. 


OF 


INST. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SAM- 


CUBIC 


TEMPER- 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


PLING 


FEET 


ATURE 


X FINER 


Z FINER 


Z FINER 


Z FINER 


POINTS 


PER 


WATER 


THAN 


THAN 


THAN 


THAN 



(COUNT) SECOND (DEG C) .062 ^t^ .125 Hi .250 t*i .500 ^«^ 



NOV 



MAR 



MAY 



8.. 


1335 ] 




7 


10.5 


6 


20 


46 


73 


8.. 


1340 ] 




7 


10.5 


1 


2 


5 


16 


8.. 


1343 ] 




7 


10.5 


2 


5 


9 


24 


8.. 


1346 ] 




7 


10.5 


1 


3 


8 


20 


8.. 


1351 ] 




7 


10.5 


1 


2 


5 


16 


8.. 


1356 1 




7 


10.5 


1 


3 


7 


16 




1543 ] 


L 58 




13.5 


__ 




3 


14 




1546 : 


L 58 




13.5 


-- 




4 


10 




1549 ] 


L 58 




13.5 


— 


-- 


2 


17 




1553 ] 


L 58 




13.5 


-- 


— 


3 


31 




1557 ] 


L 58 




13.5 


— 




11 


62 




1606 


L 58 




13.5 


— 




14 


66 




1351 


L 13 




14.0 


-- 




4 


15 




1352 


L 13 




14.0 


1 




13 


29 




1353 


L 13 




14.0 


-- 




9 


35 




1354 


L 13 




14.0 


-- 




6 


48 




1355 


L 13 




14.0 


-- 




5 


16 




1356 


L 13 




14.0 


— 


2 


11 


42 



PESCADERO CREEK BASIN 



125 



11162500 PESCADERO CREEK NEAR PESCADERO, CA--Continued 



DATE 



NOV 
8 
8 
8 
8 
8 
8 

MAR 



MAY 



TION OF 


SURFACE B 


ED MATERI 


AL, WATER 


YEAR OCT 


OBER 1992 


TO SEPTB 


HBER 1993— Continued 


BED 


BED 


BED 


BED 


BED 


BED 


BED 


BED 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


Z FINER 


X FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


1.00 rw 


2.00 NM 


li.OO VK 


8.00 M^ 


16.0 h*l 


32.0 m 


64.0 m 


128 Ifi 


86 


89 


91 


92 


98 


100 






62 


83 


92 


95 


98 


100 


— 


-- 


55 


68 


75 


80 


90 


100 


— 


— 


31 


36 


39 


44 


54 


66 


92 


100 


29 


36 


43 


54 


75 


100 


— 


— 


26 


30 


34 


40 


52 


83 


100 


— 


63 


89 


95 


98 


100 


__ 








59 


89 


96 


99 


99 


100 


— 


— 


83 


97 


100 


— 


— 


— 


— 


— 


60 


67 


71 


76 


85 


100 


— 


— 


92 


95 


96 


97 


100 


— 


— 


— 


94 


97 


97 


98 


99 


100 


— 


— 


67 


88 


95 


98 


100 


_- 


__ 


__ 


69 


86 


91 


94 


98 


100 


— 


— 


99 


100 


-- 


-- 


-- 


— 


-- 


— 


98 


100 


— 


-- 


— 


— 


— 





22 


24 


26 


30 


39 


60 


76 


100 


76 


79 


82 


84 


89 


92 


100 


— 



PARTICLE-SIZE DISTRIBUTION OF BEDLOAD. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



















TIME 


HORI- 










BAG 


TETHER 






ON BED 


ZONTAL 










MESH 


LINE 


START- 


END- 


FOR 


WIDTH 






SAM- 




SIZE 


USED IN 


ING 


ING 


BED 


OF 






PLING 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


DATE 


TIME 


METHOD , 


TYPE 


SAMPLER 


(YES=1) 


(2400 


(2400 


SAMPLE 


TICAL 






CODES 


(CODE) 


(MM) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 


DEC 




















11... 


1300 


1000 


1150 


0.250 





1250 


1305 


30 


1.0 


11... 


1315 


1000 


1150 


0.250 





1310 


1323 


30 


1.0 


JAN 




















14... 


1325 


1000 


1140 


0.250 





1304 


1344 


10 


2.0 


14... 


1405 


1000 


1140 


0.250 





1350 


1420 


10 


2.0 


FEB 




















19... 


1730 


1000 


1140 


0.250 





1720 


1738 


15 


2.0 


MAR 




















17... 


1500 


1000 


1150 


0.250 





1450 


1508 


30 


1.0 


17... 


1520 


1000 


1150 


0.250 





1511 


1530 


30 


1.0 




COMPSTD 


VER- 




SAMPLE 


DIS- 




DISCH, 


SEDI- 


SED. 




SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE, 




BEDLOAD 


MENT 


BEDLOAD 




IN 


IN 


OF 


ATION, 


INST. 




AV UNIT 


DIS- 


SIEVE 




X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 


DIAM. 




BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 


Z FINER 


DATE 


MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(TONS/ 


THAN 




(NUM) 


(NUM) 


(COUNT) 


L BANK) 


SECOND 


(DEG C) 


T/D/FT 


DAY) 


.125 m 


DEC 




















11... 


2 


26 


26 


5.00 


81 


11.5 


0.15 


3.9 


1 


11... 


2 


26 


26 


5.00 


79 


11.5 


0.15 


3.9 


1 


JAN 




















14... 


2 


21 


21 


7.00 


770 


10.5 


3.35 


145 


1 


14... 


2 


21 


21 


7.00 


735 


10.5 


3.54 


145 


1 


FEB 




















19... 


1 


23 


23 


2.00 


642 


11.5 


1.82 


84 


1 


MAR 




















17... 


2 


30 


30 


4.00 


57 


13.5 


0.03 


1.0 


— 


17... 


2 


30 


30 


4.00 


58 


13.5 


0.04 


1.0 


1 



126 



PESCADERO CREEK BASIN 



11162500 PESCADERO CREEK NEAR PESCADERO. CA- -Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR 1992 TO SEPTEMBER 1993--Contlnued 



DATE 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SIEVE 
DIAM. 



SED. 

BEDLOAD 

SIEVE 

DIAM. 



X FINER I FINER X FINER Z FINER Z FINER I FINER Z FINER I FINER X FINER 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



.250 vti .500 MM 1.00 ^^I 2.00 tvi A. 00 m 8.00 ^^I le.o m 32.0 m sa.o m 



DEC 


















11... 


29 


as 


96 


98 


99 


100 


— 


- 


11... 


23 


84 


95 


97 


99 


100 


— 


- 


JAN 


















1*... 


e 


41 


62 


74 


83 


89 


93 


100 


14... 


9 


44 


66 


75 


81 


86 


93 


100 


FEB 


















19... 


7 


37 


66 


77 


85 


90 


96 


100 


MAR 


















17... 


2 


12 


31 


38 


43 


50 


57 


60 


17... 


2 


18 


54 


71 


83 


92 


100 


- 



100 



SAN GREGORIO CREEK BASIN 
11162570 SAN GREGORIO CREEK AT SAN GREGORIO, CA 



127 



LOCATION. --Lat 37*19'33", long 122'23'08", in San Gregorlo Grant, San Mateo County, Hydrologic Unit 18050006, on 
right bank at dovmstreara side of bridge on Old Coast Highway, 0.1 mi south of town of San Gregorio, and 1.* mi 
upstream from mouth. 

DRAINAGE AREA. --50. 9 mi 2. 



WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. --October 1969 to current year. 

GAGE. — Water-stage recorder and crest-stage gage. Datum of gage is 11.40 ft above sea level. 

REMARKS. --No estimated daily discharges. Records fair. No regulation or diversion upstream from station. Low 
flows affected by domestic irrigation. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 7,910 ft^/s, Jan. 4, 1982, gage height, 21.28 ft, from rating 
curve extended above 560 ft /s on basis of contracted-opening measurement of peak flow; no flow for many days 
in some years. 



EXTREMES FOR CURRENT YEAR. --Peak 
rating curve extended above 6A 



Date 



Time 



Jan. 


7 


0345 


Jan. 


13 


0815 


Jan. 


20 


2145 



Discharge 
(ft^/s) 

1,020 

*3,530 

1,560 



discharges greater than base discharge of 1,000 ft /s and maximum (*), from 
ft /s on basis of slope-area measurement at gage height 17.48 ft: 

Discharge Gage height 
Time (ft^/s) (ft) 



Gage height 
(ft) 



9.64 

*15.07 

11.16 



Date 



Feb. 19 
Feb. 26 



2300 
0530 



1,150 
2,110 



10.05 
12.45 



Minimum daily, 0.18 ft^/s, Oct. 11, 16, 17. 



DAY 



OCT 



DISCHARGE , 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.21 


2.7 


1.2 


340 


51 


127 


77 


19 


14 


4.6 


2.7 


.84 


2 


.21 


2.2 


1.6 


110 


47 


107 


63 


18 


12 


4.6 


2.1 


1.6 


3 


.39 


1.9 


5.5 


52 


45 


97 


59 


19 


11 


4.7 


1.8 


1.4 


4 


.33 


1.6 


3.3 


34 


43 


84 


55 


20 


13 


5.2 


1.4 


.97 


5 


.30 


1.4 


2.0 


27 


42 


74 


51 


18 


17 


4.7 


1.3 


1.4 


6 


.42 


1.4 


22 


43 


39 


68 


48 


18 


16 


4.6 


1.5 


1.8 


7 


.33 


1.4 


29 


664 


40 


63 


42 


18 


16 


3.9 


1.7 


2.1 


8 


.25 


1.4 


8.4 


374 


86 


59 


39 


17 


13 


3.6 


2.5 


1.9 


9 


.24 


1.3 


14 


178 


175 


55 


39 


16 


12 


3.6 


2.3 


1.7 


10 


.20 


1.3 


39 


118 


98 


53 


36 


15 


11 


3.3 


2.2 


1.6 


11 


.18 


.94 


62 


78 


107 


51 


34 


15 


10 


3.9 


2.2 


1.3 


12 


.23 


.27 


27 


201 


75 


48 


32 


14 


9.0 


3.2 


2.3 


1.1 


13 


.29 


.22 


15 


2220 


65 


46 


31 


13 


9.1 


3.2 


2.2 


1.5 


14 


.33 


.24 


11 


903 


59 


45 


30 


12 


8.3 


3.2 


2.3 


1.9 


15 


.24 


.30 


8.3 


360 


54 


43 


29 


13 


8.6 


3.0 


2.8 


1.6 


16 


.18 


.81 


6.7 


281 


50 


41 


27 


13 


9.0 


3.0 


2.9 


1.3 


17 


.18 


1.2 


9.3 


415 


57 


51 


37 


12 


8.3 


2.8 


2.7 


.99 


18 


.26 


1.3 


14 


468 


141 


55 


35 


12 


6.8 


2.8 


2.2 


1.2 


19 


.34 


1.5 


8.6 


243 


514 


48 


29 


12 


6.2 


3.4 


2.1 


1.9 


20 


.59 


1.5 


7.2 


533 


545 


44 


27 


12 


7.3 


3.2 


2.6 


1.6 


21 


.43 


1.8 


6.0 


555 


247 


41 


25 


12 


7.0 


3.6 


2.8 


1.5 


22 


1.0 


1.8 


5.3 


454 


173 


39 


23 


11 


6.4 


3.2 


2.4 


1.4 


23 


1.1 


2.5 


4.8 


222 


275 


56 


23 


11 


6.1 


2.8 


1.3 


1.3 


24 


.58 


2.3 


4.3 


157 


221 


117 


28 


12 


6.0 


2.8 


1.2 


.94 


25 


.38 


1.7 


4.1 


123 


170 


70 


24 


17 


5.1 


2.9 


1.5 


.81 


26 


.47 


1.5 


3.8 


101 


678 


172 


23 


15 


4.5 


3.0 


1.4 


.86 


27 


.47 


1.4 


3.8 


85 


230 


122 


21 


17 


5.2 


3.2 


1.4 


.48 


28 


.51 


1.4 


44 


74 


159 


110 


21 


15 


5.6 


3.3 


.93 


.61 


29 


6.7 


1.4 


113 


66 





87 


20 


13 


5.0 


3.2 


1.2 


.93 


30 


11 


1.4 


108 


59 





78 


20 


13 


4.7 


2.9 


1.0 


.89 


31 


4.0 




43 


55 





74 





16 


~~~ 


2.7 


.82 


— — — 


TOTAL 


32.34 


42.08 


635.2 


9593 


4486 


2225 


1048 


458 


273.2 


108.1 


59.75 


39.42 


MEAN 


1.04 


1.40 


20.5 


309 


160 


71.8 


34.9 


14.8 


9.11 


3.49 


1.93 


1.31 


MAX 


11 


2.7 


113 


2220 


678 


172 


77 


20 


17 


5.2 


2.9 


2.1 


MIN 


.18 


.22 


1.2 


27 


39 


39 


20 


11 


4.5 


2.7 


.82 


.48 


AC-FT 


64 


83 


1260 


19030 


8900 


4410 


2080 


908 


542 


214 


119 


78 



128 



SAN GREGORIO CREEK BASIN 
11162570 SAN GREGORIO CREEK AT SAN GREGORIO, CA--Continuod 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 1993, BY WATER YEAR <WY) 

MAR AFR MAY 



OCT 



NOV 



DEC 



JAN 



FEB 



JUN 



JUL 



AUG 



SEP 



MEAN 


3.16 


26.4 


53.6 


97.6 


107 


92.6 


41.4 


12.6 


6.05 


3.05 


1.59 


1.27 


MAX 


11.6 


162 


297 


345 


379 


432 


259 


68.5 


20.5 


11.7 


6.68 


4.46 


(WY) 


las'! 


1973 


198'. 


1982 


1986 


1983 


1982 


1983 


1982 


1974 


1982 


1983 


MIN 


.000 


.71 


1.70 


1.17 


2.21 


2.98 


1.05 


1.42 


.35 


.019 


.000 


.000 


(WY) 


1978 


1977 


1977 


1991 


1977 


1977 


1977 


1977 


1981 


1988 


1977 


1977 



SUM1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
INSTANTANEOUS LOW FLOW 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1970 - 1993 



10246.03 






19000.09 












28.0 






52.1 






36.9 
111 
1.16 




1983 

1977 


1970 


Feb 


12 


2220 


Jan 


13 


4120 


Jan 


4 1982 


.00 


Aug 


13 


.18 


Oct 


11 


.00 


Aug 


11 1972 


.02 


Aug 


16 


.23 


Oct 


11 


.00 


Aug 


11 1972 








3530 


Jan 


13 


7910 


Jan 


4 1982 








15.07 


Jan 


13 


21.28 


Jan 


4 1982 








.18 


Oct 


11 


.00 


Sep 


16 1992 


20320 






37690 






26720 






52 






111 






71 






2.0 






8.4 






4.7 






.10 






.85 






.20 







SAN GREGORIO CREEK BASIN 

11162570 SAN GREGORIO CREEK AT SAN GREGORIO, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. -- 

SEDIMENT DATA: Water year 1986, December 1989 to April 1993 (discontinued). 

o 

REMARKS. --Zero bedload discharge observed for flows less than 45 ft /s during current year. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



129 



DATE 



TIME 



DIS- 






SEDI- 


SED. 


SED. 


SED. 


SED. 


SED. 


CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP 


INST. 




SEDI- 


DIS- 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM 



FEET 
PER 



ATURE 
WATER 



SUS- 



SUS- Z FINER Z FINER Z FINER Z FINER Z FINER 



PENDED PENDED 



THAN 



THAN 



SECOND (DEG C) (MG/L) (T/DAY) .062 m .125 



THAN 



THAN 



THAN 



.250 m .500 m 1.00 VK 



NOV 

19... 
DEC 

11.. 

15.. 
JAN 

21. . 
FEB 

26.. 
MAR 

18. . 
APR 

28.. 



1005 



1.5 



1220 


A5 


1015 


8.6 


1510 


A06 


1325 


548 


1A25 


67 


1'.45 


21 



10.5 



0.01 



11.5 


136 


17 


7.5 


12 


0.28 


14.5 


764 


837 


10.5 


2120 


3140 


1A.5 


46 


8.3 


14.5 


6 


0.34 



68 

98 
62 

78 

74 

84 
68 



99 

91 
87 

93 



100 

97 
95 

100 



99 
99 



100 
100 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 













DIS- 






BED 




BED 


BED 


BED 








NUMBER 


CHARGE, 






MAT 




MAT. 


MAT. 


MAT. 










DF 


INST. 






SIEVE 


SIEVE 


SIEVE 


SIEVE 








SAM- 


CUBIC 


TEMPER- 


DIAM 




DIAM. 


DIAM. 


DIAM. 








PLING 


FEET 


ATURE 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE 


TIME 


POINTS 


PER 


WATER 


THAN 


THAN 


THAN 


THAN 








(COUNT) 


SECOND 


(DEG C) 


.062 


^ 


.125 


MM 


.250 


m 


.500 


Ml 


NOV 
































19. 




1105 






1.5 




10.5 




1 




4 




9 




15 


19. 




1108 






1.5 




10.5 




2 




4 




6 




8 


19. 




1110 






1.5 




10.5 




2 




4 




7 




13 


19. 




1115 






1.5 




10.5 




3 




8 




14 




24 


19. 




1120 






1.5 




10.5 




3 




8 




16 




31 


19. 




1125 






1.5 




10.5 


— 






1 




2 




7 


19. 




1130 






1.5 




10.5 




1 




1 




3 




6 


MAR 
































18. 




1557 






62 




14.5 




9 




24 




43 




55 


18. 




1559 






62 




14.5 




5 




10 




17 




25 


18. 




1601 






62 




14.5 




1 




3 




7 




11 


18. 




1606 






62 




14.5 




1 




3 




8 




13 


18. 




1610 






62 




14.5 




1 




2 




3 




6 


18. 




1613 






62 




14.5 


— 






1 




5 




14 


18. 




1620 






62 




14.5 




1 




5 




18 




56 






BED 


BED BED 


BED 


BED 


BED 


BED 








MAT. 


MAT . MAT . 


MAT. 


MAT. 


MAT. 


MAT. 








SIEVE 


SIEVE SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 








DIAM. 


DIAM. DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 








Z FINER 


Z FINER Z FINER 


Z FINER Z 


FINER 


Z FINER 


Z FINER 






DATE THAN 


THAN THAN 


THAN 


THAN 


THAN 


THAN 








1.00 


h« 


2.00 


MM 4.00 


MM 


8.00 


MM 16.0 


m 


32. C 


^t^ 


64.0 m 




NOV 
































19.. 




24 




35 


46 




57 




74 




85 




100 






19.. 




12 




16 


24 




34 




60 




84 




100 






19.. 




22 




32 


44 




57 




72 




88 




100 






19.. 




37 




48 


61 




72 




86 




100 




-- 






19.. 




50 




62 


74 




85 




93 




100 




— 






19.. 




13 




20 


32 




49 




75 




100 




— 






19.. 




14 




24 


38 




56 




76 




100 




— 




MAR 
































18.. 




S8 




59 


59 




60 




65 




83 




100 






18.. 




30 




35 


39 




45 




59 




80 




100 






18.. 




14 




16 


18 




25 




40 




91 




100 






18.. 




17 




20 


23 




28 




39 




68 




100 






18.. 




9 




11 


14 




19 




36 




100 




— 






18.. 




19 




21 


24 




29 




43 




100 




— 






18.. 




75 




80 


84 




91 




99 




100 




— 





130 



SAN GREGORIO CREEK BASIN 



11162570 SAN GREGORIO CREEK AT SAN GREGORIO, CA--Continuad 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



SAM- 
PLING 
TIME METHOD, 
CODES 













TIME 


HORI- 




BAG 


TETHER 






ON BED 


ZONTAL 




MESH 


LINE 


START- 


END- 


FOR 


WIDTH 




SIZE 


USED IN 


ING 


ING 


BED 


OF 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


TYPE 


SAMPLER 


(YES-1) 


(2400 


(2400 


SAMPLE 


TICAL 


(CODE) 


(^«) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 



JAN 




















21... 


1540 


1000 


1140 


0.250 





1530 


1555 


15 


2.0 


FEB 




















26... 


1400 


1000 


1140 


0.250 





1350 


1405 


15 


2.0 


26... 


1420 


1000 


1140 


0.250 





1415 


1430 


15 


2.0 


MAR 




















18... 


1505 


1000 


1150 


0.250 





1452 


1514 


30 


1.0 


18... 


1525 


1000 


1150 


0.250 





1518 


1534 


30 


1.0 




COMPSTD 


VER- 




SAMPLE 


DIS- 




DISCH, 


SEDI- 


SED. 




SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE, 




BEDLOAD 


MENT 


BEDLOAD 




IN 


IN 


OF 


ATION, 


INST. 




AV UNIT 


DIS- 


SIEVE 




X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 


DIAM. 




BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 


I FINER 


DATE 


MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(TONS/ 


THAN 




(NUM) 


(NUM) 


(COUNT) 


L BANK) 


SECOND 


(DEG C) 


T/D/FT 


DAY) 


.062 Hi 



JAN 

21. . . 
FEB 

26... 

26... 
MAR 

18.., 

18... 



21 



21 



1.00 



401 



14.5 



2.64 111 



2 


22 


22 


1.00 


524 


10.5 


0.46 


28 


2 


22 


22 


1.00 


508 


10.5 


0.79 


28 


2 


23 


23 


3.60 


65 


14.5 


0.08 


2.0 


2 


23 


23 


3.60 


65 


14.5 


0.09 


2.0 



DATE 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD 



SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 



X FINER X FINER I FINER Z FINER I FINER I FINER I FINER X FINER I FINER 



THAN 



THAN 



THAN 



THAN 



.125 N« .250 m .500 (♦< 1.00 



THAN 



THAN 



THAN 



THAN 



THAN 



2.00 m 4.00 m 8.00 W 16.0 bW 32.0 Hi 



JAN 
















21... 


1 


2 


10 


32 


56 


75 


88 


FEB 
















26... 


4 


20 


73 


92 


97 


99 


100 


26... 


3 


15 


58 


75 


80 


88 


95 


MAR 
















18. . . 


1 


6 


37 


69 


84 


95 


100 


18... 


1 


8 


53 


84 


92 


97 


99 



97 



99 



100 



100 



100 



PILARCITOS CREEK BASIN 
11162630 PILARCITOS CREEK AT HALF MOON BAY, CA 



131 



LOCATION. --Lat 37*28'00", long 122*25'59", on north boundary of Mlramontes Grant, San Mateo County, Hydrologlc 
Unit 18050006, on left bank 50 ft downstream from State Highway 1, 0.3 ml northwest of town of Half Moon Bay, 
and 1.0 ml upstream from mouth. 

DRAINAGE AREA. --27. 1 ml 2. 



PERIOD OF RECORD. — July 1966 to current year. 
SEDIMENT DATA: June 1990. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage Is 31.51 ft above sea level. Prior to Nov. 17, 
1983, at site 800 ft downstream at different datum. 

REMARKS. — Records fair. Flow slightly regulated by storage in Pilarcltos Lake 10 ml upstream, capacity, 
3,100 acre-ft. Water is diverted to city of San Francisco water system; small diversions for irrigation 
upstream from station by pumping. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 4,750 ft'/s, Jan. 4, 1982, gage height, 13.08 ft, site and 
datum then in use, from rating curve extended above 1,000 ft /s on basis of contracted-opening measurement of 
peak flow; no flow at times in most years. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 200 ft^/s and maximum (*), from 
rating curve extended above 210 ft /s on basis of 



Date 



Jan. 
Jan. 



Time 



0645 
1515 



Discharge 
(ft^/s) 



240 
304 



Gage height 
(ft) 

3.70 
4.18 



of slope-area measurement of peak flow: 

Discharge 
Date Time (ft^/s) 



Jan . 13 
Jan. 20 



0600 
1945 



*1,010 
474 



Gage height 
(ft) 

*8.22 
S.33 



No flow for many days. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


e.OO 


2.5 


.59 


95 


el9 


41 


19 


6.3 


3.8 


.53 


.28 


.00 


2 


e.OO 


2.6 


5.8 


32 


el8 


36 


16 


6.5 


3.1 


.55 


.36 


.00 


3 


e.OO 


1.8 


5.0 


18 


el7 


34 


15 


7.0 


3.1 


.74 


.32 


.00 


4 


e.OO 


.93 


1.7 


12 


el6 


30 


15 


7.2 


4.7 


.94 


.10 


.06 


5 


e.OO 


.68 


1.2 


10 


el5 


e28 


14 


8.5 


4.9 


.80 


.17 


.39 


6 


e.OO 


.61 


18 


33 


el4 


e27 


13 


6.8 


4.1 


.73 


.36 


.52 


7 


e.OO 


.55 


7.4 


180 


el4 


e25 


13 


5.1 


3.7 


.73 


.51 


.40 


8 


e.OO 


.58 


4.9 


136 


el5 


e24 


13 


5.1 


3.1 


.91 


.39 


.18 


9 


e.OO 


.66 


15 


62 


e30 


e23 


13 


5.1 


2.8 


1.2 


.24 


.16 


10 


e.OO 


.59 


32 


43 


e28 


e22 


12 


5.1 


2.4 


.84 


.00 


.08 


11 


e.OO 


.47 


21 


30 


e27 


e22 


11 


4.8 


2.1 


1.1 


.00 


.23 


12 


e.OO 


.46 


11 


106 


e24 


e21 


11 


4.8 


el. 9 


.82 


.13 


.46 


13 


e.OO 


.47 


7.4 


e605 


e22 


e20 


10 


4.4 


el. 7 


.48 


.38 


.44 


14 


e.OO 


.48 


5.6 


e330 


e21 


e20 


10 


4.1 


el. 5 


.43 


.62 


.30 


15 


e.OO 


.45 


3.8 


e91 


e20 


el9 


10 


4.0 


el. 4 


.43 


.86 


.36 


16 


e.OO 


1.6 


2.8 


e88 


el9 


eig 


8.8 


4.0 


el. 4 


.56 


.72 


.29 


17 


e.OO 


.66 


9.0 


ege 


e23 


elB 


12 


3.9 


el. 3 


.55 


.42 


.42 


18 


e.OO 


.54 


6.0 


el02 


e40 


eia 


9.3 


3.8 


el. 3 


.62 


.33 


.53 


19 


e.OO 


.98 


4.2 


e80 


e81 


el7 


7.5 


3.6 


el. 2 


.99 


.49 


.35 


20 


e.04 


.90 


3.1 


el20 


77 


17 


6.7 


4.5 


el.l 


1.1 


.84 


.35 


21 


e.OO 


.84 


3.3 


220 


59 


16 


6.5 


4.0 


el.l 


.87 


.99 


.15 


22 


e.OO 


1.5 


2.7 


166 


51 


16 


6.4 


3.4 


el.O 


.33 


.79 


.21 


23 


e.OO 


1.1 


2.0 


102 


104 


24 


7.4 


3.3 


.96 


.25 


.48 


.27 


24 


e.OO 


.79 


2.1 


79 


69 


46 


7.7 


4.8 


1.1 


.31 


.19 


.22 


25 


e.OO 


.68 


2.0 


61 


57 


25 


6.5 


4.9 


.85 


.93 


.20 


.24 


26 


e.OO 


.63 


1.7 


49 


103 


43 


6.2 


5.5 


.81 


.84 


.21 


.25 


27 


e.OO 


.76 


1.6 


40 


64 


34 


5.7 


4.8 


.76 


.44 


.16 


.22 


28 


e.OO 


.84 


14 


34 


49 


29 


5.4 


4.1 


.95 


.51 


.24 


.05 


29 


18 


.74 


26 


31 





23 


4.9 


3.6 


.49 


.50 


.31 


.04 


30 


2.9 


.65 


13 


e29 





21 


5.7 


4.0 


.40 


.45 


.31 


.05 


31 


.82 




8.1 


e27 





19 





4.4 





.52 


.19 





TOTAL 


21.76 


27.04 


241.99 


3107 


1096 


777 


301.7 


151.4 


59.02 


21.00 


11.59 


7.22 


MEAN 


.70 


.90 


7.81 


100 


39.1 


25.1 


10.1 


4.88 


1.97 


.68 


.37 


.24 


MAX 


18 


2.6 


32 


605 


104 


46 


19 


8.5 


4.9 


1.2 


.99 


.53 


MIN 


.00 


.45 


.59 


10 


14 


16 


4.9 


3.3 


.40 


.25 


.00 


.00 


AC-FT 


43 


54 


480 


6160 


2170 


1540 


598 


300 


117 


42 


23 


14 


e Estimated. 

























132 



PILARCITOS CRZEK BASIN 



11162630 PILARCITOS CREEK AT HALF MOON BAY, CA- -Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1966 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



MEAN 


1.22 


5.79 


16.1 


«0.6 


41.9 


37.9 


19.4 


5.47 


1.94 


.87 


.52 


.33 


MAX 


A. 44 


32.5 


92.1 


164 


234 


278 


127 


37.2 


8.22 


3.21 


2.01 


1.26 


(WY) 


1983 


1983 


1971 


1982 


1983 


1983 


1982 


1983 


1967 


1957 


1982 


1983 


MIN 


.000 


.000 


.59 


.A8 


.66 


l.** 


.073 


.009 


.000 


.000 


.000 


.000 


(WY) 


1967 


1991 


1991 


1991 


1977 


1988 


1977 


1977 


1972 


1966 


1966 


1966 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1966 



1993 



3476.35 






5822.72 












9.50 






16.0 






14.2 
73.9 
.51 




1983 
1977 


426 


Feb 


12 


60S 


Jan 


13 


2150 


Jan 


4 1982 


.00 


Jul 


28 


.00 


Oct 


1 


.00 


Jul 


1 1966 


.00 


Aug 


24 


.00 


Oct 


1 


.00 


Jul 


1 1966 








1010 


Jan 


13 


4750 


Jan 


4 1982 








8.22 


Jan 


13 


13.08 


Jan 


4 1982 


6900 






11550 






10300 






21 






35 






28 






1.4 






2.8 






1.8 






.00 






.06 






.00 







SAN FRANCISCO BAY 133 

11162690 SAN FRANCISCO BAY AT PRESIDIO MILITARY RESERVATION, CA 

WATER-QUALITY RECORDS 

LOCATION.— Lat 37*48'24", long 122°27'5'i", in NE 1/4 NE 1/A sec. 36. T.l S., R.6 W. , in San Miguel Grant, San 
Francisco County, Hydrologic Unit 18050002, at end of Coast Guard dock at Presidio Military Reservation. 

PERIOD OF DAILY RECORD.— 

SPECIFIC CONDUCTANCE: October 1990 to current year. 
WATER TEMPERATURE: October 1990 to current year. 

INSTRUMENTATION. --Water-quality monitor since October 1990. 

REMARKS. --Interruptions in record were due to malfunction of the sensing and/or recording instrvunents. The probe 
is set at 4.0 ft below Mean Lower Low Water (MLLW) . Daily maximums and minimums sometimes differ from tidal- 
cycle (24.8 hours) maximums and minimums. 

EXTREMES FOR PERIOD OF RECORD.— 

SPECIFIC CONDUCTANCE: Maximum recorded, 50,900 microsiemens. May 26, June 30, and July 1, 1991; minimum 

recorded, 20,600 microsiemens. Mar. 31, 1993. 
WATER TEMPERATURE: Maximum recorded, 18.5'C, several days in July 1992, June 12, August 11, 26, 27, 1993; 
minimum recorded 8.0*C, several days during December 1990 and January 1991. 

EXTREMES FOR CURRENT YEAR.— 

SPECIFIC CONDUCTANCE: Maximum recorded, 50.700 microsiemens, Aug. 8; minimum recorded, 20,600 microsiemens. 

Mar. 31. 
WATER TEMPERATURE: Maximum recorded, 18.5*C, June 12, Aug. 11, 26, 27; minimum recorded. 9.0"C, Jan. 15. 

SPECIFIC CONDUCTANCE. US/CM @ 25 DEGREES CELSIUS. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN 
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH 



1 


48200 


47000 


48400 


47500 








48600 


43300 


44100 


28900 


39200 


23500 


2 


48400 


47300 


48400 


47200 








47900 


42800 


44400 


33000 


43700 


22000 


3 


48400 


46800 


48400 


47000 








47900 


43700 


45200 


35400 


42000 


27900 


4 


48600 


47200 


48400 


47300 








47500 


44400 


46100 


37700 


43600 


31700 


5 


48600 


47400 


48400 


47400 








47400 


44400 


46000 


39300 


44900 


35100 


6 


48600 


47600 


48300 


47300 








47300 


44100 


45900 


39500 


45400 


35300 


7 


48500 


47300 


48300 


47200 








47600 


44200 


45900 


39700 


44600 


36500 


8 


48700 


47000 


48400 


47300 








47300 


43800 


45200 


40400 


44500 


38400 


9 


48800 


46600 


48600 


47300 








47300 


43900 


44900 


37700 


44200 


37300 


10 


48500 


47400 


48500 


47200 








46900 


43400 


44900 


39000 


44000 


37400 


11 


48500 


47500 


48500 


47300 








46200 


42800 


44700 


40000 


44100 


37300 


12 


48600 


47700 


48600 


47400 








46000 


42200 


45300 


38800 


44500 


36500 


13 


48600 


47700 


48500 


47300 








47200 


41700 


45300 


36400 


45000 


37600 


14 


48800 


47900 


48600 


47300 








46200 


39100 


45000 


36700 


45000 


32300 


15 


48800 


47800 


48700 


47400 








45500 


36700 


45200 


36300 


44700 


35800 


16 


48700 


47800 


48500 


47400 


47700 


45800 


46300 


36800 


45300 


37300 


44100 


34700 


17 


48700 


47800 


48700 


47300 


47500 


45800 


46500 


36800 


46200 


39100 


44800 


37900 


18 


48600 


47700 


48600 


47700 


47500 


45200 


46200 


35800 


45700 


38400 


44400 


36900 


19 


48500 


47600 


48600 


47500 


47800 


45500 


46300 


36100 


46000 


40300 


44400 


36500 


20 


48400 


47500 


48700 


47500 


47700 


45600 


47000 


37500 


45700 


36000 


44100 


35600 


21 


48500 


47600 


48700 


47600 


47600 


45300 


45800 


32400 


44700 


36400 


45600 


35800 


22 


48500 


47600 


48700 


47500 


47700 


45200 


45500 


29800 


44000 


31500 


45900 


36300 


23 


48400 


47100 


48900 


47400 


47400 


45100 


45200 


29700 


44600 


30900 


45500 


37300 


24 


48300 


47500 








47200 


45200 


43800 


28200 


43300 


27500 


45100 


35100 


25 


48600 


47700 








47200 


45400 


43500 


27400 


43100 


26300 


45000 


33600 


26 


48600 


47600 








47700 


45500 


42200 


26700 


40700 


22100 


44400 


32300 


27 


48700 


47600 








47700 


45600 


42500 


27100 


44100 


21600 


44700 


31000 


28 


48700 


47600 








47900 


45600 


44200 


24600 


39200 


23600 


43300 


26500 


29 


48500 


47500 








48400 


46300 


42300 


26500 








43800 


27400 


30 


48700 


47600 








47600 


45600 


32800 


23500 








44100 


22900 


31 


48600 


47700 


— - 


— - 


48000 


45600 


45300 


23800 








44400 


20600 



MONTH 48800 46600 



48600 23500 



46200 21600 



45900 20600 



134 SAN FRANCISCO BAY 

11162690 SAN FRANCISCO BAY AT PRESIDIO MILITARY RESERVATION, CA--Continued 
SPECIFIC CONDUCTANCE, US/CM g 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAY MAX HIR MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN 
APRIL MAY JUNE JULY AUGUST SEPTEMBER 



1 


41400 


24000 


47700 


39500 


46900 


41700 


49500 


41500 


49400 


46500 


2 


43000 


25300 


47500 


41900 


47000 


42200 


49900 


42500 


49700 


46500 


3 


44200 


27500 


47500 


41000 


47100 


42400 


49800 


39500 


49700 


46700 


4 


44400 


31700 


47100 


41100 


47000 


42400 


49200 


41900 


49600 


45300 


5 


44400 


32100 


47100 


39500 


47100 


42300 


48800 


43600 


49500 


46800 


6 


45200 


33100 


47500 


41800 


47200 


42200 


49300 


45000 


49600 


46700 


7 


44600 


33100 


47200 


42100 


46900 


41400 


49500 


43300 


49800 


46300 


8 


45300 


33400 


48000 


41800 


47000 


39800 


49100 


41600 


50700 


46400 


9 


44000 


34500 


47800 


41500 


48300 


38100 


49000 


45500 


50400 


46500 


10 


44500 


32900 


47900 


42200 


47600 


35800 


49600 


46200 


49000 


45200 


11 


43600 


32800 


48200 


41500 


47800 


36500 


50100 


46300 


49300 


43600 


12 


45000 


31500 


47600 


41300 


48800 


32300 


50300 


46800 


49400 


45600 


13 


46400 


31400 


48300 


42100 


49400 


36000 


50300 


46400 


49500 


45800 


14 


47100 


31300 


47900 


38200 


48000 


36300 


50200 


46200 


49400 


46100 


15 


46200 


31500 


47900 


37900 


48600 


38100 


49900 


45700 


49100 


46000 


16 


46700 


33400 


47400 


39000 


49400 


39800 


49800 


46100 


49000 


44300 


17 


46600 


38100 


47200 


39700 


49500 


40200 


50100 


46400 


48900 


46000 


18 


45800 


38000 


47300 


40800 


49300 


41400 


49900 


46300 








19 


45300 


36900 


46600 


41800 


49300 


42600 


49900 


46400 








20 


45500 


37900 


46600 


42300 


49000 


43000 


49700 


46800 








21 


46000 


38700 


46700 


42000 


49000 


43600 


49600 


46700 








22 


45800 


39200 


46900 


42100 


48900 


42500 


49600 


46400 








23 


47100 


39300 


47000 


42000 


49200 


43700 


49400 


46400 








24 


47100 


39100 


46900 


42200 


49200 


42000 


49400 


44000 








25 


47000 


39300 


46300 


42200 


49200 


40500 


49400 


47000 








26 


46400 


39000 


47500 


43100 


48300 


40400 


49400 


46900 








27 


47600 


39600 


47700 


42600 


48700 


44600 


49300 


46800 








28 


47700 


38500 


47400 


40800 


49200 


40900 


49100 


46700 








29 


47500 


37700 


47000 


40300 


49400 


42000 


49600 


46100 








30 


46000 


38000 


47000 


42300 


49400 


43900 


49400 


46800 








31 





— 


47000 


42200 








49700 


46300 








MONTH 


48000 


24000 


48300 


37900 


49500 


32300 


50300 


39500 









WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN 

OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY 



MAX 



MIN 



MARCH 



1 


17.5 


16.0 


16.5 


16.0 


13.5 


13.0 


11.5 


9.5 


11.5 


10.0 


12.0 


11.0 


2 


17.0 


16.0 


16.5 


16.0 


13.0 


13.0 


11.0 


9.5 


12.0 


10.5 


12.5 


11.0 


3 


17.0 


16.0 


16.5 


16.0 


13.0 


13.0 


11.0 


9.5 


12.0 


11.0 


12.5 


11.5 


4 


17.0 


16.0 


16.5 


16.0 


13.0 


13.0 


11.0 


10.0 


12.0 


11.5 


13.5 


12.0 


5 


17.0 


16.0 


16.5 


16.0 


13.0 


12.5 


11.0 


10.0 


12.0 


11.5 


13.5 


12.0 


6 


17.0 


16.0 


16.5 


16.0 


13.0 


12.5 


10.5 


10.0 


12.0 


11.5 


13.0 


12.5 


7 


17.0 


16.0 


16.5 


16.0 


13.0 


12.5 


11.0 


10.0 


12.0 


12.0 


13.0 


13.0 


8 


17.0 


16.0 


16.5 


16.0 


12.5 


12.5 


11.0 


9.5 


12.5 


12.0 


13.0 


13.0 


9 


17.0 


16.0 


16.5 


15.5 


12.5 


12.5 


11.0 


10.0 


12.5 


12.0 


13.5 


13.0 


10 


17.5 


16.0 


16.0 


15.5 


13.0 


12.5 


10.5 


9.5 


12.5 


12.0 


13.5 


13.0 


11 


17.5 


16.0 


16.0 


15.0 


13.0 


12.5 


10.5 


9.5 


12.5 


12.0 


14.0 


13.0 


12 


17.5 


16.0 


16.0 


15.0 


13.0 


12.0 


10.5 


9.5 


12.5 


12.0 


14.0 


13.0 


13 


17.5 


16.0 


15.5 


15.0 


12.5 


12.0 


11.0 


9.5 


12.5 


12.0 


14.5 


13.5 


14 


17.0 


16.0 


15.5 


15.0 


12.5 


12.0 


10.5 


9.5 


12.5 


11.5 


14.5 


13.0 


15 


17.5 


16.0 


15.5 


14.5 


12.5 


12.0 


10.5 


9.0 


12.5 


12.0 


14.5 


13.5 


16 


17.5 


16.0 


15.5 


14.5 


12.5 


12.0 


11.0 


9.5 


12.5 


12.0 


14.5 


13.5 


17 


17.0 


16.0 


15.0 


14.5 


12.5 


12.0 


11.0 


9.5 


12.5 


12.0 


14.5 


13.5 


18 


17.0 


16.0 


15.0 


14.5 


12.0 


11.5 


11.0 


9.5 


12.5 


12.0 


15.0 


13.5 


19 


17.0 


16.0 


15.0 


14.5 


12.0 


11.5 


11.5 


9.5 


12.5 


12.0 


14.5 


14.0 


20 


16.5 


16.0 


15.0 


14.0 


12.0 


11.5 


11.5 


10.0 


12.5 


12.0 


15.0 


13.5 


21 


17.0 


16.0 


14.5 


14.0 


12.0 


11.5 


11.5 


10.0 


12.5 


11.5 


15.0 


13.5 


22 


17.0 


16.0 


14.5 


14.0 


12.0 


11.5 


11.5 


10.0 


12.0 


11.5 


14.5 


13.5 


23 


17.0 


16.0 


14.5 


14.0 


12.0 


11.0 


11.5 


10.0 


12.5 


11.5 


14.5 


13.5 


24 


17.0 


16.5 


14.0 


13.5 


11.5 


11.0 


11.5 


9.5 


12.0 


11.0 


14.5 


13.5 


2S 


17.0 


16.0 


14.0 


13.5 


11.5 


10.5 


11.5 


10.0 


12.0 


11.0 


14.5 


13.5 


26 


17.0 


16.0 


14.0 


13.5 


11.5 


10.5 


11.5 


10.0 


12.0 


11.0 


14.5 


13.5 


27 


17.0 


16.0 


14.0 


13.5 


11.0 


10.5 


11.5 


10.0 


12.0 


11.0 


14.5 


13.0 


28 


17.0 


16.0 


13.5 


13.5 


11.5 


10.5 


11.5 


10.0 


12.0 


11.0 


14.5 


13.0 


29 


17.0 


16.0 


13.5 


13.0 


11.5 


10.5 


11.5 


10.0 








14.0 


12.5 


30 


16.5 


15.5 


13.5 


13.0 


11.0 


10.5 


11.0 


9.5 








14.5 


12.5 


31 


16.5 


16.0 








11.0 


10.5 


12.0 


10.0 








14.0 


12.5 



MONTH 



17.5 



15.5 



16.5 



13.0 



13.5 



10.5 



12.0 



9.0 



12.5 



10.0 



15.0 



11.0 



SAN FRANCISCO BAY 



135 



11162690 SAN FRANCISCO BAY AT PRESIDIO MILITARY RESERVATION, CA--Continued 
WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



lAY 


MAX 


MIN 




APRIL 


1 


14.5 


12.5 


2 


14.5 


12.5 


3 


14.0 


12.5 


4 


14.0 


12.5 


S 


13.5 


12.5 


6 


13.5 


12.5 


7 


14.0 


12.5 


8 


14.0 


12.5 


9 


14.5 


12.5 


10 


14.5 


12.5 


11 


15.0 


12.5 


12 


14.5 


12.0 


13 


14.5 


11.5 


14 


14.5 


11.0 


IS 


14.5 


11.5 


16 


14.0 


11.0 


17 


13.0 


11.0 


18 


13.5 


11.5 


19 


13.5 


12.0 


20 


13.5 


12.0 


21 


14.0 


12.0 


22 


14.0 


12.5 


23 


14.0 


11.5 


24 


14.0 


11.5 


25 


14.0 


12.0 


26 


14.5 


12.0 


27 


14.5 


11.5 


28 


15.0 


11.5 


29 


15.0 


11.5 


30 


15.5 


11.0 


31 









MAX 


MIN 




HAY 


14.5 


11.0 


14.0 


11.0 


14.0 


11.0 


13.5 


11.5 


13.5 


11.5 


14.0 


11.5 


14.0 


11.5 


14.0 


11.0 


14.5 


11.0 


14.5 


11.0 


14.5 


11.0 


14.5 


11.5 


14.5 


12.0 


15.5 


12.5 


15.5 


12.5 


15.0 


12.5 


15.0 


12.5 


15.0 


12.5 


14.5 


13.0 


15.0 


13.5 


15.5 


14.0 


16.0 


14.0 


16.0 


14.0 


16.0 


13.5 


16.0 


14.0 


15.5 


14.5 


16.5 


14.5 


17.0 


15.0 


17.0 


15.0 


16.5 


15.0 


16.5 


15.5 



MAX 


MIN 




JUNE 


17.0 


15.5 


17.0 


15.5 


17.0 


15.5 


17.0 


15.5 


17.0 


15.5 


17.0 


15.5 


17.0 


15.5 


17.5 


15.0 


18.0 


14.0 


18.0 


14.0 


18.0 


13.5 


18.5 


12.5 


18.0 


11.5 


17.5 


12.5 


16.5 


12.0 


16.5 


11.5 


16.5 


11.5 


16.5 


11.5 


16.0 


12.0 


15.5 


12.5 


15.5 


12.5 


16.0 


13.0 


16.5 


12.5 


17.0 


12.5 


17.0 


12.5 


16.0 


13.0 


15.0 


12.5 


15.5 


12.5 


15.5 


12.0 


16.0 


12.5 



MAX 


MIN 




JULY 


16.0 


12.5 


16.0 


12.5 


15.5 


12.0 


15.5 


12.5 


15.5 


12.5 


15.5 


13.0 


15.5 


13.5 


15.5 


13.5 


15.5 


14.0 


16.0 


14.0 


16.0 


14.0 


16.0 


14.0 


16.0 


14.0 


16.5 


14.5 


16.5 


15.0 


17.0 


14.5 


17.0 


14.5 


17.0 


14.5 


16.5 


14.5 


16.5 


14.5 


16.5 


14.5 


17.0 


14.5 


17.0 


14.5 


16.5 


14.0 


16.0 


14.5 


16.5 


14.5 


16.5 


14.5 


16.5 


14.5 


16.5 


14.5 


16.5 


15.0 


17.0 


15.0 



MAX 


MIN 


AUGUST 


17.0 


15.0 


17.5 


15.0 


17.5 


15.5 


17.5 


16.0 


17.5 


16.0 


17.5 


16.0 


17.5 


16.0 


17.5 


16.0 


18.0 


16.0 


18.0 


16.0 


18.5 


16.0 


18.0 


16.0 


17.5 


15.5 


17.5 


15.5 


17.0 


15.5 


17.5 


15.5 


17.5 


15.5 


17.5 


15.5 


17.4 


15.5 


17.5 


16.0 


17.5 


15.5 


17.5 


15.5 


17.5 


15.0 


17.5 


15.0 


17.5 


15.0 


18.5 


14.5 


18.5 


15.0 


18.0 


15.5 


18.0 


15.5 


17.5 


15.5 


17.0 


15.5 



MAX 


MIN 


SEPTEMBER 


17.5 


16.0 


17.5 


16.0 


17.0 


16.0 


17.0 


16.0 


17.0 


16.0 


17.0 


16.0 


17.5 


15.5 


17.5 


15.5 


17.5 


15.5 


17.5 


15.5 


17.0 


15.0 


17.5 


15.0 


17.0 


15.0 


16.5 


15.0 


16.5 


15.0 


16.5 


15.5 


16.5 


15.5 


16.5 


15.5 


16.5 


15.5 


16.5 


15.0 


16.0 


15.0 


16.0 


15.0 


16.0 


15.0 


16.0 


15.0 


16.5 


15.0 


16.5 


15.0 


16.0 


15.0 


16.0 


15.0 


16.0 


14.5 


16.0 


14.5 



MONTH 15 . 5 



11.0 



17.0 



11.0 



18.5 



11.5 



17.0 



12.0 



18.5 



14.5 



17.5 



14.5 



136 SAN FRANCISCO BAY 

11162700 SAN FRANCISCO BAY AT PIER 2«, AT SAN FRANCISCO, CA 

WATER-QUALITY RECORDS 

LOCATION . —Lat 37**7'27". long 122'23'05", in SE 1/4 NW l/A sec. 2, T.2 S., R.5 W. , in San Miguel Grant, San 
Francisco County, Hydrologic Unit 18050002, at end of Pier 2A and directly under the west end of the San 
Francisco-Oakland Bay Bridge. 

PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: October 1989 to current year. 
WATER TEMPERATURE: October 1989 to current year. 

INSTRUMENTATION. --Water-quality monitor since October 1989. 

RQ1ARKS. — Interruptions in record were due to malfunction of the sensing and/or recording instruments. Upper 
probe is set at 8.8 ft below Mean Lower Low Water (MLLW) . Lower probe is set at 39.3 ft below MLLW. Daily 
maximums and minimums sometimes differ from tidal-cycle (2^.8 hours) maximums and minimuros . 

EXTREMES FOR PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: (Upper probe) Maximvun recorded, 50,700 microsiemens, Aug. 13, 1991; minimum recorded, 
17,A00 microsiemens, Jan. 25, 1993. 

(Lower probe) Maximum recorded, 50,300 microsiemens, Sept. 6, 9-12, 1991; minimum recorded, 
17,800 microsiemens, Jan. 23, 1993. 
WATER TEMPERATURE: (Upper probe) Maximum recorded, 20.5'C, July 23, 1992; minlroum recorded, 7.5'C, 
Dec. 26, 30, 1990, Jan. 1-3, 1991. 

(Lower probe) Maximum recorded, 20.0*C, on several days in July 1992; minimum recorded, 7.5*C, 
Jan. 2, 3, 1991. 

EXTREMES FOR CURRENT YEAR.— 

SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 49,400 microsiemens, Oct. 26; minimum recorded, 
17,400 microsiemens, Jan. 23. 

(Lower probe) Maximum recorded, 48,100 microsiemens, Nov. 11-13; minimum recorded, 17,800 microsiemens, 
Jan. 23. 
WATER TEMPERATURE: (Upper probe) Maximum recorded, 19.5°C, July 30, Aug. 1, 24; minimum recorded, 8.5'C, 
Jan. 12, 15-17. 

(Lower probe) Maximum recorded, 19.5°C, Aug. 1, 24; minimum recorded, 9.5'C, Jan. 12-17. 

SPECIFIC CONDUCTANCE, US/CM @ 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


Ml 


\Rca 


1 


48300 


47500 


47900 


47000 


47000 


44900 


47000 


41600 


40800 


25700 


38000 


20600 


2 


48000 


47500 


47700 


46200 


47200 


44400 


44500 


39800 


39300 


28500 


38200 


22000 


3 


48000 


46700 


47300 


45400 


46900 


45100 


44500 


40100 


42100 


32600 


37400 


21600 


4 


47900 


46500 


47300 


44600 


46900 


44800 


45000 


41100 


42400 


34400 


37000 


27000 


5 


47900 


46300 


47500 


45400 


47100 


45400 


46200 


41000 


42500 


35600 


40200 


29900 


6 


47600 


46100 


47900 


45600 


47300 


46100 


46700 


40400 


43000 


35200 


41600 


31100 


7 


47500 


46300 


48000 


46800 


47500 


44700 


47100 


40900 


43900 


36800 


42400 


31200 


8 


47900 


46900 


48100 


47200 


47300 


46000 


46300 


39600 


44900 


37800 


42100 


33100 


9 


47600 


46900 


48100 


47100 


47500 


43800 


45700 


39700 


43700 


37300 


42400 


34500 


10 


47700 


46800 


48100 


47200 


47600 


44100 


45600 


38900 


43500 


36600 


42400 


34000 


11 


47400 


46800 


48200 


47200 


47400 


43500 


44800 


38100 


44000 


32900 


42000 


33800 


12 


47600 


46700 


48200 


47000 


47000 


42600 


44200 


36800 


40900 


31100 


41300 


30900 


13 


47600 


46400 


48200 


47000 


46600 


42800 


45000 


35300 


41500 


28600 


40900 


32600 


14 


47400 


46800 


48200 


47000 


46500 


43100 


44000 


35000 


41100 


28500 


41600 


32000 


15 


47500 


46800 


48000 


47100 


46300 


42900 


41700 


31800 


41700 


31000 


40600 


29600 


16 


47400 


46700 


48000 


47100 


46200 


41900 


41900 


26600 


40400 


29000 


39900 


29000 


17 


47500 


46800 


47900 


47100 


46300 


41900 


42800 


25900 


41900 


32200 


41500 


33700 


18 


47400 


46800 


47900 


47000 


45900 


41800 


41400 


26000 


40600 


30900 


40100 


32600 


19 


47500 


46900 


47800 


47100 


46200 


42300 


40400 


26600 


42700 


36300 


39500 


31200 


20 


47500 


46900 


47800 


47000 


46500 


41700 


41800 


26800 


40800 


32100 


39600 


31300 


21 


47500 


47000 


47800 


47000 


46400 


41600 


40000 


26400 


39300 


26300 


40500 


31300 


22 


47600 


47000 


47900 


46900 


46300 


41400 


39300 


19900 


38500 


23900 


40500 


30300 


23 


47700 


47200 


47900 


46800 


46200 


42200 


38800 


17400 


39000 


25400 


40900 


30400 


24 


47800 


47200 


47800 


46700 


46300 


43900 


38300 


18000 


37200 


21300 


40500 


27300 


25 


47900 


47200 


47800 


46500 


46200 


43900 


37400 


20000 


35500 


19400 


39800 


25300 


26 


49400 


47200 


47700 


46400 


46100 


43700 


36900 


20400 


33900 


18800 








27 


47900 


47500 


47600 


46300 


46200 


43900 


35200 


21700 


35800 


19900 








28 


48000 


47300 


47600 


46400 


46600 


44300 


34900 


22400 


35500 


20800 








29 


48000 


47300 


47400 


46500 


46600 


44400 


34600 


21900 














30 


48000 


47300 


47200 


45500 


45800 


43300 


33800 


24200 














31 


48000 


47300 








45100 


41500 


39900 


25100 















MONTH 49400 46100 



48200 44600 



47600 41400 



47100 17400 



44900 18800 



SAN FRANCISCO BAY 



137 



11162700 SAN FRANCISCO BAY AT PIER 24, AT SAN FRANCISCO, CA--Continued 

SPECIFIC CONDUCTANCE, US/CM 6 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 








42400 


35500 


44000 


37900 


45300 


39800 


47500 


42500 


47300 


44600 


2 








44800 


34900 


44900 


37800 


46200 


40200 


47500 


43000 


47300 


44200 


3 








44400 


38300 


44200 


37900 


46100 


41300 


47300 


44700 


47200 


44600 


4 








44400 


38300 


44000 


38100 


46400 


40800 


46900 


44600 


47300 


44000 


5 








45300 


34900 


44100 


36900 


46400 


42300 


47100 


43300 


46700 


44200 


6 








44900 


39600 


44100 


36700 








47000 


43100 


46700 


44000 


7 








45300 


37200 


43700 


34800 








46200 


42200 


46600 


43400 


8 








44300 


36500 


43100 


33300 








46000 


42600 


46600 


43100 


9 








43300 


34500 


43900 


31700 


45000 


41600 


46100 


42500 


46700 


42700 


10 








44000 


36700 


43700 


32500 


44800 


41400 


45900 


42100 


46500 


42600 


11 








43500 


37800 


42100 


30800 


45300 


42300 


46200 


42400 


47300 


43300 


12 








43000 


35200 


45000 


33100 


45800 


41700 


46000 


41500 


47300 


44000 


13 








42700 


36700 


45100 


32600 


46000 


40900 


47000 


42400 


47400 


44700 


14 


39700 


26100 


43300 


35200 


44400 


31100 


46300 


40200 


47300 


42300 


47200 


44900 


15 


39600 


28300 


43600 


36300 


44700 


34500 


46300 


41300 


47300 


44100 


47000 


45000 


16 


40800 


31000 


42400 


36300 


45000 


34600 


46500 


41400 


47200 


42800 


47000 


44400 


17 


41600 


33900 


42900 


35600 


45200 


34400 


47000 


41500 


47400 


42400 


46200 


44500 


18 


39500 


32000 


42400 


33600 


44400 


37500 


47100 


41500 


47200 


44500 


46200 


44400 


19 


40900 


31300 


43400 


38400 


44800 


38700 


47000 


43400 


47200 


44000 


46300 


44400 


20 


40700 


31900 


42900 


38700 


45300 


38800 


46600 


41900 


47000 


44100 








21 


41100 


33300 


43300 


38000 


44400 


38700 


46700 


43300 


47100 


43800 








22 


41200 


35700 


44700 


38400 


44500 


38500 


46300 


43700 


47400 


43500 








23 


41600 


36000 


43800 


38200 


44700 


37900 


46500 


44000 


47400 


44800 


46800 


43500 


24 


42700 


32800 


44000 


39100 


44900 


35900 


47000 


43500 


47600 


43600 


46700 


42800 


25 


42500 


31500 


44000 


41700 


45100 


35800 


47300 


43800 


47400 


42900 


46400 


41800 


26 


42400 


31900 


44200 


39600 


45500 


38700 


47300 


43800 


47000 


42600 


46400 


43400 


27 


41800 


32900 


44100 


38600 


45300 


39600 


47300 


43000 


47300 


42600 


46500 


42900 


28 


42400 


32200 


44000 


36800 


44600 


38100 


47400 


43300 


47500 


43100 


46600 


43500 


29 


42900 


30900 


43400 


36500 


45000 


39300 


47400 


43400 


47600 


44500 


46700 


44700 


30 


43100 


34600 


43400 


36700 


45500 


39100 


47600 


43300 


47500 


45100 


46800 


44800 


31 








44100 


36100 








47600 


42400 


47400 


45000 









MONTH 



45300 33600 



45500 30800 



47600 41500 



138 



SAH FRANCISCO BAY 



11162700 SAN FRANCISCO BAY AT PIER 24, AT SAN FRANCISCO, CA--Contlnued 

SPECIFIC CONDUCTANCE, US/CM 6 25 DEGR£ES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(LOWER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


47900 


47200 


47700 


46800 


46300 


44200 


45400 


40600 


44000 


26600 


42300 


20000 


2 


47800 


47100 


47700 


46100 


46300 


43800 


44200 


38300 


44200 


27500 


43200 


20500 


3 


47700 


46400 


47500 


45500 


45900 


44300 


44100 


38900 


43200 


31000 


42800 


21800 


4 


47700 


46100 


47500 


44600 


46100 


44200 


43900 


39400 


42400 


32700 


40600 


26000 


5 


47600 


45900 


47600 


45500 


46100 


44600 


44500 


39300 


43500 


34000 


40400 


28400 


6 


47500 


45800 


47800 


45800 


46300 


45000 


44900 


39100 


43200 


34100 


41400 


30000 


7 


47300 


45900 


47900 


46900 


46600 


43800 


45300 


39500 


43400 


35300 


42000 


29700 


8 


47300 


45500 


47900 


46700 


46200 


44800 


44700 


38200 


43200 


35900 


41100 


31700 


9 


47300 


46300 


48000 


46700 


46600 


43100 


44200 


38100 


42200 


35800 


40700 


33200 


10 


47200 


46300 


48000 


46600 


46500 


41600 


43800 


37400 


41600 


34800 


41100 


32700 


11 


47200 


46300 


48100 


46600 


46400 


42500 


43100 


36400 


42300 


31900 


41000 


32500 


12 


47100 


46200 


48100 


46600 


46100 


41300 


42300 


35500 


41500 


30800 


41800 


30000 


13 


47000 


46300 


48100 


46600 


45700 


41900 


43700 


34300 


40800 


29200 


41300 


31800 


14 


46800 


45700 


47900 


46300 


45600 


43700 


43400 


34300 


41400 


28300 


41200 


30800 


15 


47000 


45800 


47700 


46400 


45100 


42100 


42200 


31200 


42100 


29900 


40500 


29200 


16 


47100 


45900 


47500 


46300 


44900 


41000 


41500 


27500 


40700 


28500 


41200 


28400 


17 


47100 


45600 


47500 


46400 


45100 


41000 


42500 


26000 


41900 


30900 


41500 


32600 


18 


47000 


45700 


47400 


45800 


44900 


40600 


41300 


26300 


40900 


30700 


40500 


31900 


19 


47200 


45800 


47300 


46200 


45000 


41300 


40800 


26300 


42100 


34600 


40500 


31000 


20 


47200 


46000 


47300 


46100 


45200 


40800 


41400 


27100 








40000 


31500 


21 


47200 


45900 


47200 


46000 


45100 


40700 


40100 


26000 








40800 


31600 


22 


47400 


46200 


47200 


46100 


45000 


40400 


40000 


19200 








40900 


29600 


23 


47400 


46200 


47300 


44700 


45100 


40900 


39700 


17800 








41500 


30800 


24 


47400 


46400 


46800 


43800 


45000 


42300 


39200 


18300 








41400 


27900 


25 


47400 


46300 


47200 


44300 


45200 


42200 


38900 


18600 


38700 


20600 


40500 


25000 


26 


47800 


46500 


45200 


42600 


45200 


42000 


39400 


20700 


41800 


18300 








27 


47500 


46300 


47100 


44300 


44500 


42300 


39500 


21300 


42200 


18800 








28 


47600 


46600 


46900 


43000 


45000 


42700 


40500 


22500 


41800 


19700 








29 


47500 


46700 


46800 


44800 


44900 


42800 


41400 


29900 














30 


47700 


46400 


46500 


44600 


44700 


41900 


42000 


23500 














31 


47800 


46700 








44500 


40300 


44500 


24200 















MONTH 47900 45500 



48100 42600 



46600 40300 



45400 



17800 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 








45700 


36500 


45300 


38100 


46700 


40300 


47100 


42400 


46600 


43700 


2 








44800 


35500 


45200 


37800 


46400 


40700 


47000 


42800 


46400 


43300 


3 








44700 


38300 


45600 


38100 


46700 


41600 


47000 


44300 


46000 


42500 


4 








44800 


38300 


44800 


38200 


46700 


41400 


46800 


44400 


46200 


42800 


5 








45700 


38200 


44500 


37200 


46700 


42600 


47000 


44000 


46200 


43200 


6 








46200 


39400 


44500 


37200 








46900 


42900 


45600 


42800 


7 








45200 


37600 


44000 


35700 








46800 


42000 


45700 


42300 


8 








45100 


37300 


44400 


34000 








46500 


42700 


45900 


41800 


9 








44500 


35600 


44800 


32600 


46000 


42000 


46600 


42500 


45800 


41200 


10 


--_ 





44800 


36800 


44600 


33700 


46300 


41800 


46400 


42100 


45900 


41300 


11 








44400 


37600 


45200 


31900 


46000 


42900 


46500 


42300 


45500 


41800 


12 








44600 


36300 


46200 


34300 


46600 


42100 


47100 


41800 


46000 


42400 


13 








44200 


37400 


46500 


35400 


46300 


41100 


47000 


42700 


45600 


43100 


14 


44300 


27000 


44600 


35800 


46300 


32400 


46500 


40600 


47200 


42600 


45500 


43100 


15 


43900 


33200 


44200 


37400 


45900 


35200 


46500 


41300 


47400 


44100 


45300 


43200 


16 


43000 


31800 


44200 


36700 


46500 


35300 


46600 


41400 


47300 


43000 


45400 


43300 


17 


42400 


34500 


44300 


36400 


46300 


33500 


47000 


41600 


47500 


42800 


45500 


43600 


18 


41000 


32100 


44900 


34200 


45800 


38200 


47000 


41500 


47500 


44500 


45400 


43400 


19 


41900 


31700 


44200 


38700 


46400 


39200 


46900 


43200 


47300 


44600 


45500 


43400 


20 


42100 


32300 


43700 


38800 


46000 


39200 


46500 


41800 


47200 


44300 








21 


42100 


33900 


44500 


38200 


45200 


39100 


46700 


43300 


47300 


44000 








22 


42200 


35700 


44900 


38500 


45000 


39200 


46300 


43500 


47500 


43600 








23 


42800 


35900 


44500 


38400 


45300 


38700 


46400 


43800 


47300 


44700 


45300 


42100 


24 


44100 


33200 


44700 


39100 


45700 


36800 


46800 


43400 


47700 


43600 


45300 


41400 


25 


43700 


32300 


44400 


41000 


46000 


37000 


47000 


43800 


47500 


42600 


45000 


41600 


26 


42600 


32700 


44700 


39500 


46000 


39200 


46900 


43500 


47200 


42800 


44900 


42000 


27 


43500 


33500 


45100 


38400 


46400 


39900 


46700 


42600 


46900 


42600 


45100 


41500 


28 


44300 


33000 


45400 


37100 


46300 


39300 


46600 


42700 


47100 


42800 


45200 


42200 


29 


44400 


32100 


45200 


36700 


45900 


39800 


46600 


42800 


46900 


44000 


45400 


43200 


30 


44800 


35100 


45100 


37000 


46400 


39700 


47200 


42900 


46700 


44400 


45400 


43400 


31 








45300 


37000 








47300 


42200 


46600 


44300 









MONTH 



46200 34200 



46500 31900 



47700 41800 



SAN FRANCISCO BAY 



139 



11162700 SAN FRANCISCO BAY AT PIER 24. AT SAN FRANCISCO, CA— Continued 

WATBB TEMPERATURE. DEGREES CELSIUS. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


18.5 


16.5 


17.0 


16.0 


13.5 


13.0 


11.0 


10.0 


11.5 


10.0 


12.0 


11.0 


2 


18.5 


16.5 


17.0 


16.5 


13.5 


12.5 


10.5 


9.5 


11.5 


10.5 


12.0 


11.0 


3 


18.0 


16.5 


17.0 


16.5 


13.5 


12.5 


10.5 


9.5 


12.0 


11.0 


12.5 


12.0 


4 


18.0 


16.5 


17.0 


16.5 


13.0 


12.5 


10.5 


9.5 


12.0 


11.5 


13.5 


12.0 


5 


18.0 


16.5 


17.5 


16.0 


13.0 


12.5 


11.0 


9.5 


12.0 


11.5 


13.5 


12.5 


6 


18.0 


17.0 


17.5 


16.0 


13.0 


12.5 


11.0 


9.0 


12.0 


11.5 


13.5 


12.5 


7 


18.5 


17.0 


17.5 


16.0 


13.0 


12.5 


11.0 


9.5 


12.5 


12.0 


13.5 


13.0 


8 


18.5 


16.5 


17.5 


16.0 


12.5 


12.5 


10.5 


9.5 


12.5 


12.0 


13.5 


13.0 


9 


18.5 


16.5 


17.5 


16.0 


13.0 


12.5 


10.5 


9.5 


12.5 


12.0 


14.0 


13.5 


10 


18.5 


16.5 


17.0 


15.5 


13.0 


12.5 


10.5 


9.5 


12.5 


12.0 


14.0 


13.5 


11 


19.0 


16.5 


17.0 


15.5 


13.0 


12.5 


10.5 


9.0 


12.5 


12.0 


14.0 


13.5 


12 


19.0 


16.5 


16.5 


15.5 


12.5 


12.0 


10.0 


8.5 


12.5 


11.5 


15.0 


13.5 


13 


19.0 


16.0 


16.5 


15.0 


12.5 


12.0 


10.5 


9.0 


12.5 


11.5 


14.5 


14.0 


14 


19.0 


16.5 


16.5 


15.0 


12.5 


12.0 


10.5 


9.0 


12.5 


11.5 


15.0 


13.5 


15 


18.5 


16.5 


16.0 


15.0 


12.5 


12.0 


10.0 


8.5 


12.5 


12.0 


15.0 


14.0 


16 


18.5 


16.5 


16.0 


15.0 


12.5 


11.5 


10.0 


8.5 


12.5 


11.5 


15.0 


14.0 


17 


18.5 


16.5 


16.0 


15.0 


12.5 


11.5 


10.5 


8.5 


12.5 


12.0 


15.0 


14.0 


18 


18.0 


16.5 


15.5 


14.5 


12.0 


11.0 


10.5 


9.0 


12.5 


12.0 


15.5 


14.0 


19 


18.0 


16.5 


15.5 


14.5 


12.0 


11.0 


10.5 


9.0 


12.5 


12.0 


15.0 


14.5 


20 


18.0 


16.5 


15.0 


14.5 


12.0 


11.0 


10.5 


9.5 


12.5 


11.5 


15.0 


14.5 


21 


18.0 


16.5 


15.0 


14.0 


12.0 


11.0 


10.5 


9.5 


12.0 


11.5 


15.5 


14.5 


22 


18.0 


16.5 


15.0 


14.0 


12.0 


11.0 


10.5 


9.5 


12.0 


11.5 


15.5 


14.5 


23 


18.5 


16.5 


15.0 


14.0 


12.0 


11.0 


11.0 


9.5 


12.0 


11.5 


15.5 


14.0 


24 


18.5 


16.5 


14.5 


14.0 


11.5 


11.0 


11.0 


9.5 


12.0 


11.0 


15.5 


14.0 


25 


18.5 


16.5 


14.5 


13.5 


11.5 


10.5 


11.0 


10.0 


12.0 


11.0 


15.5 


14.0 


26 


18.5 


16.0 


14.0 


13.5 


11.5 


10.5 


11.0 


10.0 


12.0 


11.0 








27 


18.0 


16.5 


14.0 


13.5 


11.0 


10.5 


11.0 


10.0 


12.0 


11.0 








28 


18.0 


16.0 


14.0 


13.5 


11.0 


10.5 


11.0 


10.0 


12.0 


11.0 








29 


17.5 


16.0 


14.0 


13.5 


11.0 


10.5 


11.0 


10.0 














30 


17.0 


16.0 


13.5 


13.0 


11.0 


10.0 


11.0 


10.0 














31 


17.0 


16.0 








10.5 


9.5 


11.5 


10.0 















MONTH 



19.0 



16.0 



17.5 



13.0 



13.5 



9.5 



11.5 



8.5 



12.5 



10.0 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



1 

2 

3 
4 
5 


... 





6 
7 
8 
9 
10 








11 








12 








13 








14 


14.5 


12.5 


15 


15.0 


12.5 


16 


14.5 


12.5 


17 


14.0 


12.0 


18 


14.5 


12.5 


19 


14.5 


13.0 


20 


14.5 


13.0 


21 


14.5 


13.0 


22 


14.5 


13.0 


23 


14.5 


13.0 


24 


15.0 


13.0 


25 


14.5 


13.0 


26 


15.0 


13.0 


27 


15.5 


13.0 


28 


15.5 


13.0 


29 


15.5 


12.5 


30 


16.0 


13.0 


31 









16.5 


13.0 


15.5 


12.0 


15.0 


12.5 


15.0 


12.5 


15.0 


12.0 


14.5 


12.0 


15.5 


12.0 


15.5 


12.5 


16.0 


13.0 


15.5 


13.0 


15.0 


13.0 


15.5 


13.5 


16.0 


13.5 


16.5 


14.0 


16.0 


13.5 


16.0 


14.0 


16.0 


14.0 


17.0 


14.5 


15.5 


14.0 


16.0 


14.5 


16.5 


14.5 


16.5 


14.5 


16.5 


15.0 


16.5 


14.5 


17.0 


15.0 


16.5 


15.0 


17.0 


15.0 


17.0 


15.5 


17.5 


16.0 


17.0 


16.0 


17.5 


16.0 



17.5 


16.0 


17.5 


16.0 


17.5 


16.0 


17.5 


16.0 


17.0 


16.0 


17.5 


16.0 


18.0 


16.0 


18.0 


16.0 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


13.5 


18.5 


13.5 


17.5 


13.5 


17.5 


13.5 


17.0 


13.0 


18.0 


13.5 


17.5 


14.0 


17.5 


14.0 


17.5 


13.5 


17.5 


14.0 


18.5 


14.0 


17.5 


14.0 


18.0 


14.0 


18.5 


13.5 


17.5 


13.5 


17.5 


13.5 


17.5 


14.5 


18.0 


14.0 


18.0 


13.5 



18.0 


14.0 


18.0 


13.0 


18.0 


13.0 


18.5 


13.0 


17.0 


13.0 


17.5 


15.0 


18.0 


15.5 


17.5 


15.5 


17.5 


15.5 


18.0 


15.5 


18.0 


15.5 


17.5 


15.5 


18.0 


15.5 


19.0 


15.0 


18.5 


15.0 


18.5 


15.0 


19.0 


15.0 


18.5 


15.0 


18.5 


16.0 


19.0 


15.5 


18.5 


15.0 


18.5 


15.0 


18.5 


15.0 


18,5 


15.0 


19.0 


15.0 


18.5 


15.0 


19.5 


15.0 


19.0 


15.5 



AUGUST 


19.5 


15.5 


19.0 


16.0 


18.5 


16.5 


19.0 


16.5 


18.5 


17.0 


18.5 


17.0 


19.0 


17.5 


19.0 


17.5 


19.0 


17.5 


19.0 


17.5 


19.0 


17.5 


19.0 


17.5 


19.0 


16.5 


18.5 


16.0 


19.0 


16.0 


19.0 


16.5 


19.0 


16.0 


19.0 


16.0 


18.5 


16.0 


18.5 


16.5 


18.5 


16.5 


19.0 


16.0 


18.5 


16.0 


19.5 


16.0 


19.0 


16.0 


19.0 


16.0 


18.5 


16.0 


18.5 


15.5 


18.5 


15.5 


18.5 


16.0 


19.0 


16.5 



SEPTEMBER 



18.5 


16.5 


18.5 


16.5 


18.5 


16.5 


18.5 


16.5 


18.5 


17.0 


18.5 


17.0 


19.0 


17.5 


18.5 


17.5 


18.5 


17.0 


19.0 


17.0 


18.5 


16.0 


19.0 


16.0 


19.0 


15.5 


18.5 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


16.0 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


17.5 


15.5 


17.5 


16.0 


17.5 


16.0 


17.5 


16.0 


17.5 


15.5 


17.5 


15.5 


17.5 


15.5 


17.5 


15.0 



MONTH 



17.5 



12.0 



18.5 



13.0 



19.5 



15.5 



19.0 



15.0 



140 



SAN FRANCISCO BAY 



11162700 SAN FRANCISCO BAY AT PIER 24, AT SAN FRANCISCO. CA--Contlnued 

HATER TEMPERATURE. DEGREES CELSIUS. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(LOWER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


18.5 


16.5 


17.0 


16.0 


13.5 


13.0 


11.5 


10.5 


13.0 


11.5 


13.5 


12.0 


2 


18.5 


16.5 


17.5 


16.5 


13.5 


13.0 


11.5 


10.0 


13.0 


11.5 


13.5 


12.5 


3 


18.5 


16.5 


17.5 


16.5 


13.5 


13.0 


11.5 


10.0 


13.0 


12.0 


13.5 


13.0 


4 


18.0 


16.5 


17.5 


16.5 


13.0 


12.5 


11.5 


10.0 


13.0 


12.0 


13.5 


13.0 


5 


18.0 


16.5 


17.5 


16.0 


13.0 


12.5 


11.5 


10.0 


13.0 


12.5 


14.0 


13.0 


6 


18.0 


16.5 


17.5 


16.0 


13.0 


12.5 


11.5 


10.0 


13.0 


12.5 


14.0 


13.5 


7 


18.0 


16.5 


17.5 


16.0 


13.0 


12.5 


11.5 


10.0 


13.0 


12.5 


14.0 


13.5 


6 


18.5 


16.5 


17.5 


16.0 


13.0 


12.5 


11.5 


10.0 


13.5 


13.0 


14.5 


14.0 


9 


18.5 


16.5 


17.5 


16.0 


13.0 


12.5 


11.5 


10.0 


13.5 


13.0 


14.5 


14.0 


10 


18.5 


16.5 


17.0 


15.5 


13.0 


13.0 


11.5 


10.0 


13.0 


13.0 


14.5 


14.0 


11 


19.0 


16.5 


17.0 


15.5 


13.0 


12.5 


11.0 


10.0 


13.5 


13.0 


14.5 


14.0 


12 


19.0 


16.0 


16.5 


15.5 


13.0 


12.5 


11.0 


9.5 


13.5 


13.0 


15.0 


14.0 


13 


19.0 


16.0 


16.5 


15.0 


13.0 


12.0 


11.0 


9.5 


13.5 


12.5 


15.0 


14.0 


14 


18.5 


16.0 


16.5 


15.0 


12.5 


12.5 


11.5 


9.5 


13.5 


12.5 


15.5 


14.0 


15 


18.5 


16.0 


16.0 


15.0 


12.5 


12.0 


11.0 


9.5 


13.0 


12.5 


15.5 


14.5 


16 


18.5 


16.0 


16.0 


15.0 


12.5 


12.0 


11.0 


9.5 


13.0 


12.5 


15.5 


14.5 


17 


18.0 


16.0 


16.0 


15.0 


12.5 


12.0 


11.5 


9.5 


13.0 


12.5 


15.5 


14.0 


18 


18.0 


16.0 


16.0 


14.5 


12.5 


11.5 


11.5 


10.0 


13.0 


12.5 


15.5 


14.5 


19 


18.0 


16.0 


15.5 


14.5 


12.5 


11.5 


11.5 


10.0 


13.0 


13.0 


15.5 


14.5 


20 


18.0 


16.5 


15.5 


14.5 


12.5 


11.5 


12.0 


10.5 


13.0 


12.5 


15.5 


14.5 


21 


18.0 


16.0 


15.5 


14.0 


12.5 


11.5 


12.0 


10.5 


13.0 


12.5 


15.5 


14.5 


22 


18.0 


16.0 


15.0 


14.0 


12.5 


11.5 


12.0 


10.5 


13.0 


12.5 


15.5 


14.0 


23 


18.0 


16.0 


15.0 


14.0 


12.5 


11.5 


12.0 


10.5 


13.0 


12.0 


15.5 


14.0 


24 


18.5 


16.0 


14.5 


13.5 


12.0 


11.5 


12.0 


10.5 


13.0 


12.0 


15.5 


14.0 


25 


18.5 


16.0 


14.5 


13.5 


12.0 


11.0 


12.0 


11.0 


13.0 


12.0 


15.0 


14.0 


26 


18.5 


16.0 


14.0 


13.5 


12.0 


11.0 


12.5 


11.0 


13.0 


11.5 








27 


18.0 


16.0 


14.0 


13.5 


11.5 


11.0 


12.5 


11.0 


13.0 


12.0 








28 


18.0 


16.0 


14.0 


13.5 


11.5 


11.0 


12.5 


11.0 


13.0 


12.0 








29 


17.5 


16.0 


14.0 


13.5 


11.5 


11.0 


12.5 


11.5 














30 


17.5 


16.0 


14.0 


13.5 


11.5 


10.5 


12.5 


11.0 














31 


17.0 


16.0 








11.5 


10.0 


13.0 


11.0 















MONTH 19.0 



16.0 



17.5 



13.5 



13.5 



10.0 



13.0 



9.5 



13.5 



11.5 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



1 

2 
3 
4 
S 
6 








;;; 





7 

8 

9 

10 


— 


— 


11 


— 





12 


— 





13 


— 





14 


14.5 


11.5 


15 


14.5 


11.5 


16 


14.5 


11.5 


17 


14.0 


11.5 


18 


14.5 


12.5 


19 


14.5 


12.5 


20 


14.5 


12.5 


21 


14.5 


12.5 


22 


14.5 


13.0 


23 


14.5 


12.5 


24 


15.0 


12.0 


25 


14.5 


12.5 


26 


15.0 


12.5 


27 


15.5 


12.5 


28 


15.0 


12.0 


29 


16.0 


12.0 


30 


16.0 


12.0 


31 









MAY 



16.5 


11.5 


15.0 


11.5 


15.0 


11.5 


14.5 


11.5 


15.0 


11.0 


14.5 


11.5 


15.0 


11.5 


15.0 


11.5 


15.5 


12.0 


15.5 


12.0 


15.0 


12.0 


15.0 


12.0 


15.5 


12.5 


16.0 


12.5 


16.0 


13.0 


15.5 


13.0 


15.5 


13.0 


15.5 


12.5 


15.5 


13.5 


15.5 


14.0 


16.0 


14.0 


16.5 


14.0 


16.5 


14.0 


16.5 


14.0 


16.5 


14.0 


16.5 


14.5 


16.5 


15.0 


17.0 


15.0 


17.0 


15.0 


17.0 


15.5 


17.0 


15.5 



JUNE 



17.5 


15.5 


17.5 


16.0 


17.5 


15.5 


17.0 


16.0 


17.0 


16.0 


17.0 


16.0 


17.5 


16.0 


17.5 


15.5 


18.0 


15.5 


18.0 


15.0 


18.0 


14.0 


18.0 


13.0 


18.0 


12.5 


17.5 


12.5 


17.5 


12.5 


17.0 


12.0 


17.5 


12.0 


17.0 


13.0 


17.0 


12.5 


17.0 


13.0 


17.0 


13.5 


18.0 


13.5 


17.5 


14.0 


18.0 


13.5 


18.0 


13.5 


17.5 


13.5 


17.5 


13.0 


17.5 


13.0 


18.0 


13.5 


18.0 


13.0 



MAX 


MIN 




JULY 


18.0 


12.5 


18.0 


13.0 


18.0 


12.5 


18.0 


13.0 


17.0 


13.0 



MAX 



MIN 



MAX 



MIN 



17.0 


14.5 


18.0 


15.0 


17.5 


15.0 


17.5 


15.0 


18.0 


15.0 


18.0 


15.0 


17.5 


15.5 


18.0 


15.5 


18.5 


15.0 


18.5 


15.0 


18.5 


15.0 


19.0 


15.5 


18.5 


15.0 


18.5 


15.5 


18.5 


15.5 


18.5 


15.0 


18.5 


15.0 


18.5 


15.0 


18.5 


15.0 


19.0 


15.0 


18.5 


15.5 


19.0 


15.5 


19.0 


15.5 



AUGUST 



19.5 


16.0 


19.0 


16.0 


19.0 


16.0 


19.0 


16.5 


19.0 


17.0 


19.0 


17.0 


19.0 


17.0 


19.0 


17.0 


19.0 


17.5 


19.0 


17.5 


19.0 


17.0 


19.0 


17.0 


19.0 


16.5 


18.5 


16.0 


19.0 


16.0 


19.0 


16.0 


19.0 


16.0 


18.5 


16.0 


18.5 


16.0 


18.5 


16.0 


19.0 


16.5 


19.0 


16.0 


19.0 


16.0 


19.5 


15.5 


19.0 


16.0 


19.0 


16.0 


18.5 


16.0 


18.5 


15.5 


19.0 


15.5 


18.5 


16.0 


19.0 


16.5 



SEPTEMBER 



18.5 


16.5 


18.5 


16.5 


19.0 


16.5 


18.5 


16.5 


18.5 


16.5 


18.5 


17.0 


19.0 


17.0 


18.5 


17.0 


19.0 


16.5 


19.0 


16.5 


19.0 


16.5 


19.0 


15.5 


19.0 


15.5 


18.5 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


16.0 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


18.0 


15.5 


17.5 


16.0 


18.0 


16.0 


17.0 


16.0 


17.5 


16.0 


17.5 


15.5 


17.5 


15.5 


17.5 


15.5 


17.5 


15.0 



MONTH 



17.0 



11.0 



18.0 



12.0 



19.5 



15.5 



19.0 



15.0 



COLMA CREEK BASIN 141 

11162720 COLMA CREEK AT SOUTH SAN FRANCISCO, CA 

LOCATION. --Lat 37°39'l'i", long 122°25'31", in Buri Burl Grant, San Mateo County, Hydrologic Unit 18050004, on 
left bank in Orange Memorial Park, 1 . mi southwest of South San Francisco Post Office. 

DRAINAGE AREA. --10. 8 mi^. 

PERIOD OF RECORD. --October 1963 to current year. 

GAGE. --Water-stage recorder. Datum of gage is 12.53 ft above sea level. Recording rain gages at Skyline 

College, elevation 700 ft at site 2.9 mi southwest of gaging station, and on San Bruno Mountain, elevation 
930 ft at site 2.7 mi northwest of gaging station. 

REMARKS. --Records poor. Low flow affected by return flow from urban irrigation. Channel lowered in 1986. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 3,560 ft^/s, Dec. 8, 1987, gage height, 7.53 ft, from rating 
curve extended above 1,200 ft /s on basis of step-backwater computation; no flow Oct. 5, 26, 1963, and many 
days in August 1985. 

EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 900 ft^/s and maximum (*): 



Date 



Time 



Discharge Gage height 
(ft^/s) (ft) 



Dec. 


28 


0650 


1,250 


4.03 


Jan. 


1 


0355 


1,920 


5.03 


Jan. 


6 


2305 


*3,510 


*7.46 



Date 

Jan. 12 
Jan. 15 
Jan. 20 



Time 

2205 
1615 
1615 



Discharge 
(ft^/s) 



1,010 
1,150 
1,220 



Gage height 
(ft) 

3.68 
3.89 
3.99 



Minimum daily, 1.0 ft^/s, Sept. 1. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


9.5 


4.5 


el. 7 


145 


6.6 


5.1 


e4.1 


el. 7 


3.7 


2.8 


2.6 


1.0 


2 


2.5 


3.8 


el27 


5.1 


7.0 


5.9 


el. 9 


e2.3 


3.7 


2.8 


2.2 


2.2 


3 


1.9 


3.3 


el. 9 


3.5 


7.6 


11 


e2.3 


elO 


3.5 


2.9 


2.5 


3.0 


4 


1.7 


3.1 


el. 9 


3.5 


6.8 


5.0 


e9.1 


e2.3 


3.4 


2.3 


2.7 


3.1 


5 


2.1 


3.0 


e6.2 


8.9 


9.1 


5.1 


e2.3 


el. 9 


3.6 


e2.3 


3.0 


2.8 


6 


el. 5 


2.9 


e93 


228 


3.6 


5.0 


el. 7 


e2.3 


3.8 


e2.0 


3.1 


2.8 


7 


e2.8 


3.1 


e33 


84 


70 


4.8 


e2.3 


el. 7 


3.6 


62.5 


2.8 


2.5 


8 


e2.3 


3.1 


e26 


28 


19 


5.3 


elO 


e2.3 


3.3 


e2.3 


2.1 


2.4 


9 


e2.3 


2.5 


143 


9.0 


7.9 


5.7 


e2.3 


e3.4 


3.2 


e2.0 


2.8 


2.2 


10 


e2.8 


2.4 


63 


9.5 


14 


6.0 


e4.7 


e2.3 


3.4 


1.7 


3.3 


3.2 


11 


e2.8 


2.3 


29 


4.7 


5.4 


5.8 


e2.3 


e2.3 


3.2 


1.6 


2.5 


2.3 


12 


e2.3 


2.3 


4.3 


106 


4.0 


6.3 


el. 9 


e3.4 


3.3 


1.8 


2.5 


2.1 


13 


e2.3 


2.3 


3.5 


235 


4.0 


7.2 


e2.3 


e2.3 


3.4 


1.8 


2.7 


2.8 


14 


e2.3 


2.1 


3.4 


61 


4.4 


10 


e2.3 


e3.4 


3.0 


1.6 


3.0 


4.0 


15 


82.3 


2.3 


3.3 


96 


6.1 


6.6 


e3.4 


e2.3 


3.0 


1.5 


6.4 


2.8 


16 


e6.0 


el. 9 


3.6 


21 


7.8 


68 


e2.3 


el. 9 


3.4 


1.9 


5.2 


2.8 


17 


e2.3 


el. 7 


25 


136 


56 


36 


e24 


e2.3 


3.6 


1.4 


5.3 


3.2 


18 


el. 5 


el. 9 


3.1 


56 


93 


24 


e2.3 


el. 9 


3.2 


1.4 


6.0 


2.8 


19 


el. 7 


e2.3 


3.0 


17 


103 


6.9 


63.4 


e2.3 


3.4 


1.8 


5.4 


3.7 


20 


el. 5 


el5 


2.8 


135 


21 


e2.3 


e2.3 


e2.3 


3.3 


2.0 


5.9 


4.8 


21 


36 


e3.0 


2.7 


59 


17 


e2.3 


el. 9 


3.6 


3.2 


2.0 


5.1 


3.9 


22 


el. 7 


elO 


2.7 


19 


24 


e2.3 


e2.3 


15 


3.5 


2.1 


6.4 


4.8 


23 


el. 9 


e6.3 


2.9 


12 


25 


e79 


el3 


7.1 


3.0 


2.5 


10 


5.0 


24 


e2.3 


e5.0 


2.7 


9.5 


8.2 


e8.9 


e3.4 


3.7 


3.5 


2.0 


4.3 


6.4 


2S 


el. 9 


e3.0 


2.7 


8.0 


9.8 


el8 


e2.3 


3.2 


3.4 


2.6 


7.0 


2.5 


26 


e2.3 


el. 9 


2.9 


6.7 


12 


e4.1 


el. 9 


17 


3.4 


3.0 


7.6 


1.5 


27 


e2.3 


e2.3 


3.6 


6.1 


5.6 


e40 


e2.3 


9.4 


3.9 


2.1 


5.8 


2.5 


28 


3.6 


el. 7 


112 


5.6 


5.8 


e3.4 


el. 7 


3.6 


3.5 


2.8 


4.4 


4.5 


29 


28 


el. 9 


42 


5.5 





e2.3 


e2.3 


3.5 


2.7 


2.4 


3.3 


8.2 


30 


4.2 


1.9 


12 


6.3 





e2.3 


el. 9 


4.1 


2.4 


2.7 


4.6 


11 


31 


3.8 





4.2 


5.5 





e42 





14 





2.3 


3.9 





TOTAL 


142.4 


102.8 


768.1 


1535.4 


563.7 


436.6 


120.2 


138.8 


100.5 


66.9 


134.4 


106.8 


MEAN 


4.59 


3.43 


24.8 


49.5 


20.1 


14.1 


4.01 


4.48 


3.35 


2.16 


4.34 


3.56 


MAX 


36 


15 


143 


235 


103 


79 


24 


17 


3.9 


3.0 


10 


11 


MIN 


1.5 


1.7 


1.7 


3.5 


3.6 


2.3 


1.7 


1.7 


2.4 


1.4 


2.1 


1.0 


AC-FT 


282 


204 


1520 


3050 


1120 


866 


238 


275 


199 


133 


267 


212 


a 


0.34 


0.17 


2.95 


6.66 


2.41 


2.01 


0.41 


0.51 


0.20 


0.01 


0.05 


0.05 


b 


1.46 


0.28 


6.80 


10.07 


4.64 


2.74 


0.57 


1.02 


0.19 


0.00 


0.00 


0.00 



e Estimated. 

a Precipitation, in inches, at San Bruno Mountain gage. 

b Precipitation, in inches, at Skyline College gage. 



142 



COLMA CREEK BASIN 



11162720 COLMA CREEK AT SOUTH SAN FRANCISCO. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1964 - 1993, BY WATER YEAR (WY) 
OCT HOV DEC JAH FEB MAR APR HAY 



JUN 



JUL 



AUG 



SEP 



MEAN 4.75 10.6 


12.2 


19.7 


15.7 


13 


.6 


5.83 


2.38 


2.19 


2.17 


2.13 




2.04 


MAX 19.3 29.0 


28.5 


49.5 


47.9 


51 


.3 


21.0 


7.59 


10.0 


9.81 


8.68 




7.81 


(WY) 1973 1974 


1984 


1993 


1983 


1983 


1967 


1988 


1989 


1989 


1989 




1989 


MIN .28 1.14 


.93 


1.47 


.71 


1.: 


50 


.13 


.35 


.40 


.12 


.060 




.11 


(WY) 1967 1976 


1976 


1976 


1964 


1966 


1964 


1964 


1964 


1964 


1985 




1964 


SUMMARY STATISTICS 


FOR 


1992 CALENDAR YEAR 






FOR 1993 WATER YEAR 




WATER YEARS 1964 


- 


1993 


ANNUAL TOTAL 




3431.1 








4216.6 














ANNUAL MEAN 




9.37 








11.6 






7.74 








HIGHEST ANNUAL MEAN 


















17.7 






1983 


LOWEST ANNUAL MEAN 


















2.33 






1964 


HIGHEST DAILY MEAN 




238 


Feb 11 






235 


Jan 13 




820 


Jan 


4 


1982 


LOWEST DAILY MEAN 




1.1 


Apr 25 






1.0 


Sep 1 




.00 


Oct 


5 


1963 


ANNUAL SEVEN-DAY MINIMUM 




1.6 


Apr 25 






1.6 


Jul 12 




.00 


Aug 


11 


1985 


INSTANTANEOUS PEAK FLOW 












3510 


Jan 6 




3560 


Dec 


8 


1987 


INSTANTANEOUS PEAK STAGE 












7.46 


Jan 6 




7.53 


Dec 


8 


1987 


ANNUAL RUNOFF (AC-FT) 




6810 








8360 






5610 








10 PERCENT EXCEEDS 




14 








24 






13 








50 PERCENT EXCEEDS 




2.6 








3.4 






1.8 








90 PERCENT EXCEEDS 




1.7 








1.9 






.59 









SAN FRANCISCO BAY 

11162765 SAN FRANCISCO BAY AT SAN MATEO BRIDGE, NEAR FOSTER CITY, CA 

WATER-QUALITY RECORDS 



143 



R.A W., In San Mateo County, Bydrologlc Unit 



LOCATION.— Lat 37*35'04", long 122'1*'59", unsurveyed, T.4 S. 
180S0004, on Pier 20 directly under San Mateo Bridge. 

PERIOD OF DAILY RECORD.— 

SPECIFIC CONDUCTANCE: October 1989 to current year. 
WATER TEMPERATURE: October 1989 to current year. 

INSTRUMENTATION.— Water-quality monitor since October 1989. 

REMARKS. — Interruptions In record were due to malfunction of the sensing and/or recording instruments. Upper 
probe is set at S.5 ft below Mean Lower Low Water (MLLW) . Lower probe is set at AS. 5 ft below MLLW. Daily 
maximums and mlnlmums sometimes differ from tidal-cycle (24.8 hours) maximums and minimums. 



50,200 microslemens, Sept. 5, 1990; minimum recorded, 
Oct. 31, Nov. 4, 9, 1990; minimum recorded. 



.5*C, Aug. 1, 2, 28, 



EXTREMES FOR PERIOD OF RECORD. -- 

SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 
27,400 microslemens. Mar. 3, 1993. 

(Lower probe) Maximum recorded, 50,300 microslemens 
28,700 microslemens, Mar. 5, 1993. 
WATER TEMPERATURE: (Upper probe) Maximum recorded, 23 
several days in December 1990 and January 1991. 

(Lower probe) Maximum recorded, 23.0'C, on several days in August 1990, 
minimum recorded, 6.5*C, Dec. 30, 1990, to Jan. 2, 1991. 
EXTREMES FOR CURRENT YEAR.-- 

SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 48,400 microslemens 
recorded, 27,400 microslemens, Mar. 3. 

(Lower probe) Maximum recorded, 48,400 microslemens, Oct. 10; minimum recorded, 28,700 microslemens, Mar 
WATER TEMPERATURE: (Upper probe) Maximum recorded, 23.5'C, Aug. 1, 2, 28; minimum recorded, 8.0*C, Jan. 11 
(Lower probe) Maximum recorded, 23.0*C, Aug. 2-6; minimum recorded, 8.S*C, several days in January. 



1993; minimum recorded, 6.S*C, on 
July 16, 17, 1992, Aug. 2-6, 1993; 

Oct. 22, Nov. 2-4; minimum 



DAY 



SPECIFIC CONDUCTANCE, US/(M 6 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


48100 


47400 


48300 


47800 


47600 


47000 


46000 


44700 


32400 


29400 


30200 


27600 


2 


48100 


47400 


48400 


47800 


47400 


46600 


45900 


44500 


32200 


30300 


29800 


27700 


3 


48100 


47400 


48400 


47300 


47300 


46400 


46000 


44500 


32300 


30400 


30100 


27400 


4 


48100 


47300 


48400 


47400 


47300 


46500 


45900 


44300 


32300 


31500 


29600 


28300 


5 


47900 


47200 


48000 


47200 


47400 


46800 


45800 


44500 


32900 


31800 


29800 


28100 


6 


47700 


46900 


47900 


46900 


47100 


46300 


45400 


44400 


33100 


32000 


30000 


28100 


7 


47500 


45600 


47800 


46800 


46900 


46200 


45300 


43300 


34100 


32100 


30200 


28300 


8 








47900 


46800 


47200 


45900 


44900 


43400 


33800 


32100 


30200 


28400 


9 








47900 


46600 


46800 


45700 


44900 


43500 


34100 


32300 


30500 


28600 


10 


47200 


46700 


48000 


46600 


46500 


45700 


44700 


43400 


34000 


32400 


30700 


28700 


11 


47300 


46700 


47900 


46600 


46500 


45300 


44600 


43500 


34100 


32400 


30700 


28700 


12 


47300 


46600 


47900 


46600 


46700 


45300 


44600 


43300 


34600 


32500 


31100 


28800 


13 


47400 


46600 


47900 


46500 


46700 


46000 


44000 


42000 


34300 


32700 


31300 


28800 


14 


47500 


46800 


47700 


46600 


46800 


45900 


43600 


40200 


34600 


32800 


31100 


29100 


15 


47800 


47200 


47800 


46600 


46800 


46100 


43400 


40200 


35100 


32800 


31600 


28900 


16 


47900 


47300 


47700 


46700 


46900 


46200 


42800 


40200 


34900 


32800 


32200 


29000 


17 


47900 


47400 


47400 


46600 


46600 


45900 


42300 


40300 


35200 


33300 


33400 


30400 


18 


47800 


47100 


47600 


46500 


46700 


45800 


41300 


38400 


35000 


33700 


33300 


30600 


19 


48000 


47100 


47600 


46900 


46800 


45800 


40600 


38500 


35100 


34000 


33800 


31000 


20 


47900 


47200 


47800 


47100 


46800 


46000 


39900 


38100 


34900 


32300 


33700 


31200 


21 


48100 


47500 


47900 


47100 


46800 


46000 


39400 


37800 


34800 


31500 


33800 


31300 


22 


48400 


47600 


47700 


46800 


46700 


46100 


39100 


37400 


34800 


31900 


33900 


31300 


23 


48300 


47700 


47700 


47100 


46700 


46100 


38800 


36000 


34600 


32600 


34100 


31100 


24 


48300 


47600 


47800 


47200 


46700 


46200 


38200 


34200 


34300 


32500 


33900 


31800 


25 


48200 


47600 


47800 


47300 


46700 


46200 


36700 


33000 


34300 


31900 








26 


48200 


47600 


47700 


47100 


46700 


46300 


35800 


32100 


34000 


31500 








27 


48300 


47700 


47600 


47200 


46800 


46200 


34300 


30900 


33000 


28900 


34500 


31800 


28 


48100 


47400 


47600 


47100 


46700 


45500 


33900 


30500 


31300 


28300 


34600 


31700 


29 


48200 


47600 


47700 


47200 


46300 


45300 


33400 


30200 








34700 


31300 


30 


48200 


47600 


47600 


47100 


46300 


45400 


33100 


29900 








34000 


30700 


31 


48300 


47800 








46200 


45400 


32600 


29300 








32600 


30400 



MONTH 



48400 46500 



47600 45300 



46000 29300 



35200 28300 



144 



SAN FRANCISCO BAY 



11162765 SAN FRANCISCO BAY AT SAN MATEO BRIDGE, NEAR FOSTER CITY. CA--Contlnued 

SPECIFIC CONDUCTANCE, US/CM 6 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTBMBER 1993 

(UPPER PROBE) 



DAY 



MAX 



KIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





APRIL 




MAY 




JUNE 


1 


32500 


31000 


35200 


30900 


39700 


38300 


2 


32300 


31200 


35100 


31700 








3 


32300 


31100 


35400 


32000 


39600 


37800 


« 


32200 


31400 


35600 


31900 


39400 


37900 


5 


32300 


31500 


35600 


31900 


39600 


38100 


6 


32300 


31600 


35800 


32100 


39600 


38300 


7 


32300 


31500 


35500 


31700 


39500 


38000 


8 


32300 


31500 


35000 


31500 








9 


32«00 


31700 


35500 


32600 








10 


32400 


31700 


35800 


33000 








11 


32400 


31900 


35500 


33100 








12 


32400 


31800 


35900 


33100 








13 


32300 


31700 


36800 


33600 








1* 


32200 


31700 


37500 


34500 








15 


32300 


31600 


37800 


35100 








16 


32600 


31500 


37700 


35400 








17 


33500 


31400 


37700 


35000 








18 


33600 


31400 


38000 


35200 








19 


33500 


31800 


38100 


35500 








20 


33400 


31200 


38100 


35800 








21 


33000 


31000 


38100 


36100 








22 


32500 


30100 














23 


32400 


29700 


38200 


36100 








2A 


32700 


30400 


38400 


36400 








25 


33000 


30600 


38800 


36600 








26 


33300 


30800 


39100 


37300 








27 


33400 


30600 


39400 


37500 








28 


33600 


30600 


39800 


38100 








29 


34200 


30700 


39500 


38000 








30 


34900 


30900 


39400 


38000 








31 








39500 


38200 









JULY 



AUGUST 



SEPTEMBER 









43200 


41500 


43800 


43300 








43400 


42000 


43800 


43100 








43200 


42100 


43800 


43100 








43200 


42200 


43800 


43100 








43300 


42200 


43800 


43100 








43200 


42400 


43600 


43000 








43200 


42400 


43700 


43100 








43200 


42300 


43600 


43000 








43200 


42400 


43600 


42900 








42900 


42400 


43600 


42800 








42900 


42400 


43600 


42900 








42900 


42400 


43800 


43100 








43200 


42600 


44000 


43100 








43700 


42700 


43900 


43100 








43700 


42500 


44000 


43200 


41900 


40300 


43900 


42700 


44000 


43200 


42400 


40400 








44000 


42600 


42100 


40400 








44100 


43300 


42100 


40500 








43900 


43300 


42200 


40500 








43800 


43000 


42200 


40700 








43700 


43100 


42500 


40600 








44000 


43100 


42400 


40800 








44100 


43200 


42500 


41000 








44200 


43200 


42500 


41100 


44000 


43200 


44300 


43300 


42300 


41100 


43900 


42900 


44400 


43600 


42400 


40900 


44100 


43200 


44500 


43600 


42500 


41000 


44000 


43200 


44400 


43600 


42600 


41100 


43900 


43100 


44500 


43700 


42800 


41400 


44000 


43200 


44300 


43500 


43000 


41500 


44000 


43300 









MONTH 34900 29700 



44500 42600 



SAN FRANCISCO BAY 



145 



11162765 SAN FRANCISCO BAY AT SAN MATEO BRIDGE, NEAR FOSTER CITY, CA— Continued 

SPECIFIC CONDUCTANCE, US/CM 6 25 DEGREES CELSIUS. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(LOWER PROBE) 



lAY 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 




OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


48200 


47100 


48000 


47100 


47100 


46700 


45000 


44500 


34300 


33400 


33200 


30600 


2 


48100 


47000 


48000 


47000 


47000 


46800 


44800 


44300 


33600 


32300 


32700 


29900 


3 


48000 


47000 


48100 


47000 


46900 


46400 


44800 


43900 


33100 


32500 


31700 


29500 


4 


48100 


47100 


48000 


47200 


46900 


46400 


44700 


43900 


33900 


32500 


30700 


29100 


5 


48200 


47000 


48100 


47800 


46800 


46300 


44600 


43600 


34700 


32600 


30300 


28700 


6 


48100 


47000 


48100 


47800 


46700 


46500 


44400 


43600 


34800 


32700 


30500 


28800 


7 


48100 


47300 


48100 


47600 


46600 


46100 


44400 


43300 


35400 


32800 


30800 


28900 


8 








48000 


47500 


46600 


45900 


44000 


42800 


35500 


33200 


30800 


29100 


9 








48000 


47400 


46500 


45800 


43900 


42600 


35400 


33200 


31000 


29000 


10 


48400 


47600 


48100 


46900 


46400 


45800 


43800 


42600 


35400 


33200 


31500 


29000 


11 


48300 


47400 


48100 


47400 


46300 


45400 


43600 


42700 


35900 


33500 


31500 


29000 


12 


48300 


47400 


48000 


47400 


46200 


45100 


43500 


42800 


35800 


33400 


31800 


29100 


13 


48200 


47300 


48100 


47200 


46300 


45200 


43700 


42800 


35800 


33400 


32300 


29300 


14 


48000 


47300 


48000 


47400 


46300 


45400 


43300 


41800 


36200 


33700 


32600 


29500 


15 


48100 


47100 


48000 


47300 


46300 


45500 


42900 


41700 


36400 


33700 


33400 


29700 


16 


48100 


47100 


47900 


47400 


46200 


45700 


42600 


41500 


36300 


33600 


34100 


30200 


17 


48100 


47000 


47800 


47300 


46300 


45600 


42000 


41100 


36200 


34200 


34900 


32100 


18 


48000 


47000 


47800 


47200 


46000 


45300 


41500 


39800 


36100 


34900 


34900 


32100 


19 


48000 


46900 


47800 


47400 


46100 


45100 


40500 


39200 


36000 


34900 


34400 


31900 


20 


48000 


47000 


47600 


47000 


46100 


45200 


39700 


38500 


35800 


34000 


34200 


31900 


21 


47900 


47000 


47600 


46900 


46100 


45100 


39200 


38000 


35700 


33500 


34300 


31900 


22 


48000 


47000 


47600 


46800 


46300 


45200 


39000 


38100 


35600 


33800 


34400 


31900 


23 


48100 


47400 


47500 


46800 


46100 


45300 


38600 


36800 


35500 


33700 


34600 


32100 


24 


48000 


47600 


47400 


46700 


46000 


45200 


38000 


36600 


35100 


33400 


34500 


32400 


25 


48000 


47100 


47300 


46700 


45900 


45300 


37200 


36000 


34900 


33200 








26 


48100 


47300 


47300 


46700 


45800 


45200 


36500 


35600 


34500 


33500 








27 


48100 


47100 


47300 


46700 


45700 


45300 


35900 


35100 


34200 


32800 


34500 


31700 


28 


48100 


47400 


47200 


46700 


45700 


44900 


35400 


34600 


33700 


31600 


34300 


32800 


29 


48100 


47200 


47200 


46700 


45600 


45200 


35300 


34700 








34200 


31000 


30 


48000 


47200 


47100 


46500 


45300 


45000 


35000 


34200 








34200 


31600 


31 


48000 


47100 








45300 


44800 


34700 


33700 








32600 


30600 



MONTH 



48100 46500 



47100 44800 



45000 33700 



36400 31600 



lAY 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 




APRIL 




MAY 




JUNE 




JULY 


AUGUST 


SEPTEMBER 


1 


31400 


30300 


36200 


32200 


40000 


37800 


38200 


36900 


43400 


41500 


44100 


43400 


2 


30900 


30200 


36000 


32700 








38500 


36800 


43900 


41800 


44200 


43400 


3 


30600 


29900 


36300 


32700 


39500 


37200 


38500 


37000 


43100 


41700 


44000 


43300 


4 


30400 


29700 


36300 


32300 


39400 


37200 


38500 


36900 


43100 


41900 


44000 


43300 


5 


30200 


29400 


36400 


32000 


39300 


37100 


38500 


37100 


43400 


42000 


43900 


43100 


6 


30100 


29200 


36600 


32100 


39000 


37000 


38700 


37200 


43000 


42000 


43800 


43100 


7 


30000 


29100 


36700 


32400 


38900 


36700 


38500 


37200 


43100 


42100 


43900 


43300 


8 


29900 


29000 


36200 


32300 


38700 


36800 


38600 


37400 


43200 


42000 


43900 


43400 


9 


30000 


29100 


36600 


32900 


38600 


36800 


38800 


37600 


43200 


42100 


44200 


43300 


10 


30000 


29200 


37200 


33600 


38600 


36600 


39000 


37700 


43000 


42100 


44100 


43200 


11 


29900 


29100 


37400 


33700 


38100 


36800 


39100 


37800 


43300 


42200 


43900 


43100 


12 


29900 


29100 


37300 


33900 


37700 


36800 


39100 


37900 


43600 


42300 


44100 


43100 


13 


29900 


29000 


38000 


35200 


37500 


36700 


39200 


37900 


43700 


42600 


44100 


42900 


14 


29900 


29100 


38800 


36200 


37100 


36700 


39300 


38000 


44500 


42500 


44000 


43000 


15 


31600 


29100 


38700 


36100 


37200 


36200 


40200 


37600 


44100 


42600 


44100 


42900 


16 


31700 


29100 


38500 


36100 


37000 


36700 


40600 


38700 


44200 


42700 


43900 


43000 


17 


33700 


29400 


38600 


35600 


37000 


36700 


41200 


38900 








43800 


43000 


18 


33100 


29500 


39000 


35800 


37000 


36800 


41100 


38900 








43800 


42900 


19 


33700 


30000 


39000 


36300 


37000 


36700 


41100 


39000 








43800 


42400 


20 


33700 


30900 


39000 


36600 


36900 


36700 


41400 


39300 








43700 


42900 


21 


33600 


30700 


39000 


36600 


36900 


36500 


41400 


39500 








43700 


42700 


22 


33000 


30300 








36900 


36500 


42100 


39800 








43700 


42800 


23 


33500 


30000 


39100 


36400 


37000 


36700 


42200 


40000 








43700 


42900 


24 


33800 


30700 


39700 


36600 


37500 


36800 


42200 


40500 








43700 


42900 


25 


33900 


30700 


39600 


36900 


37800 


36900 


42100 


40900 


44300 


43300 


43800 


43000 


26 


33900 


30800 


40100 


37600 


37600 


36900 


42200 


40800 


44300 


43300 


43800 


43100 


27 


34000 


30700 


40300 


38400 


37800 


36800 


42200 


40700 


44300 


43400 


43800 


43200 


28 


35100 


30900 


40000 


38500 


37800 


36700 


42500 


40800 


44200 


43400 


43800 


43200 


29 


35200 


31200 


39900 


38400 


37900 


36800 


42600 


40900 


44200 


43400 


43900 


43300 


30 


36100 


31900 


39800 


38300 


38000 


36700 


43000 


41000 


44200 


43400 


43900 


43200 


31 








39900 


38000 








43200 


41200 


44100 


43400 









MONTH 36100 29000 



43200 36800 



44200 42400 



146 



SAN FRANCISCO BAY 



11162765 SAN FRANCISCO BAY AT SAN MATEO BRIDGE. NEAR FOSTER CITY, CA-Continued 



WATER TEMPERATURE, 



DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
(UPPER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


21.0 


20.5 


18.5 


18.0 


13.5 


13.0 


9.5 


9.5 


11.0 


10.5 


12.0 


11.5 


2 


21.0 


20.5 


18.5 


18.0 


13.0 


13.0 


9.5 


9.0 


11.0 


10.5 


12.5 


11.5 


3 


20.5 


20.0 


18.5 


18.0 


13.0 


13.0 


9.5 


9.0 


11.0 


10.5 


13.0 


11.5 


A 


21.0 


20.0 


18.5 


18.0 


13.0 


12.5 


9.5 


9.0 


11.0 


10.5 


13.0 


12.0 


5 


21.0 


20.0 


18.5 


18.0 


12.5 


12.5 


9.0 


8.5 


11.5 


11.0 


13.0 


12.0 


6 


21.0 


20.0 


18.5 


18.0 


12.5 


12.0 


9.0 


8.5 


11.5 


11.0 


13.5 


12.5 


7 


21.5 


20.0 


18.5 


18.0 


12.5 


12.0 


9.0 


8.5 


11.5 


11.0 


14.0 


12.5 


8 








18.0 


17.5 


12.0 


12.0 


9.0 


8.5 


11.5 


11.0 


14.0 


13.0 


9 








18.0 


17.5 


12.5 


12.0 


9.0 


8.5 


11.5 


11.5 


14.5 


13.0 


10 


21.5 


20.5 


17.5 


17.0 


12.5 


12.5 


9.0 


8.5 


11.5 


11.0 


14.5 


13.5 


11 


21.5 


20.5 


17.0 


16.5 


12.5 


12.0 


9.0 


8.0 


12.0 


11.5 


14.5 


13.5 


12 


21.5 


20.5 


17.0 


16.5 


12.5 


12.0 


8.5 


8.5 


12.0 


11.5 


15.0 


14.0 


13 


21.0 


20.0 


17.0 


16.5 


12.0 


11.5 


9.0 


8.5 


12.0 


11.5 


15.5 


14.5 


14 


21.0 


20.0 


17.0 


16.0 


12.0 


11.5 


9.5 


9.0 


12.0 


11.5 


15.5 


14.5 


15 


20.5 


20.0 


16.5 


16.0 


11.5 


11.5 


9.5 


9.0 


12.0 


11.5 


16.0 


15.0 


16 


20.5 


20.0 


16.5 


16.0 


11.5 


11.0 


9.5 


9.0 


12.0 


11.5 


15.5 


15.0 


17 


20.0 


19.5 


16.0 


16.0 


11.5 


11.0 


9.5 


9.0 


12.0 


11.5 


15.5 


15.0 


18 


20.0 


19.5 


16.0 


16.0 


11.0 


10.5 


9.5 


9.0 


12.0 


11.5 


16.0 


15.0 


19 


20.0 


19.5 


16.0 


15.5 


11.0 


10.5 


9.5 


9.0 


12.0 


11.5 


16.0 


15.0 


20 


20.0 


19.5 


15.5 


15.0 


11.0 


10.5 


10.0 


9.5 


12.0 


11.5 


16.0 


15.0 


21 


20.0 


19.5 


15.0 


14.5 


11.0 


10.5 


10.5 


9.5 


12.0 


11.5 


16.0 


15.5 


22 


20.0 


19.5 


15.0 


14.5 


11.0 


10.5 


10.5 


9.5 


11.5 


11.5 


16.5 


15.5 


23 


20.0 


19.5 


14.5 


14.0 


10.5 


10.5 


10.5 


9.5 


11.5 


11.5 


16.0 


15.5 


24 


20.0 


19.5 


14.5 


14.0 


10.5 


10.5 


10.5 


9.5 


11.5 


11.0 


16.5 


15.5 


25 


20.0 


19.5 


14.0 


13.5 


10.5 


10.0 


10.5 


9.5 


11.5 


11.0 








26 


20.0 


19.5 


14.0 


13.5 


10.0 


10.0 


10.5 


10.0 


11.0 


11.0 








27 


20.0 


19.5 


14.0 


13.5 


10.0 


9.5 


10.5 


10.0 


12.0 


10.5 








28 


19.5 


19.0 


14.0 


13.5 


10.0 


9.5 


10.5 


10.0 


12.0 


11.0 


15.5 


14.5 


29 


19.0 


18.5 


14.0 


13.5 


9.5 


9.5 


11.0 


10.0 








15.5 


15.0 


30 


19.0 


18.5 


13.5 


13.0 


9.5 


9.5 


11.0 


10.0 








16.0 


14.5 


31 


18.5 


18.0 








9.5 


9.5 


11.0 


10.0 








16.5 


15.0 



MONTH 



18.5 



13.0 



13.5 



9.5 



11.0 



8.0 



12.0 



10.5 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 


16.0 


15.0 


19.0 


17.0 


20.0 


19.0 


22.5 


20.0 


23.5 


21.5 


22.5 


21.5 


2 


16.0 


15.0 


18.5 


17.0 


19.5 


19.0 


22.5 


20.0 


23.5 


21.5 


22.5 


22.0 


3 


16.0 


15.5 


18.0 


16.5 


20.0 


19.0 


22.0 


20.0 


23.0 


22.0 


22.5 


21.5 


4 


16.5 


15.5 


18.0 


16.5 


19.5 


18.5 


22.0 


20.0 


23.0 


22.0 


22.0 


21.5 


5 


16.5 


15.5 


18.0 


16.5 


19.0 


18.5 


22.0 


20.0 


23.0 


22.5 


22.0 


21.0 


6 


16.5 


15.5 


17.5 


16.5 


18.5 


18.5 


22.0 


20.5 


23.0 


22.5 


21.5 


21.0 


7 


17.0 


15.5 


17.5 


16.5 


18.5 


18.0 


22.0 


21.0 


22.5 


22.0 


21.5 


21.0 


8 


16.5 


16.0 


17.5 


16.5 


19.0 


18.5 


22.0 


21.5 


22.0 


22.0 


21.5 


21.0 


9 


17.0 


16.0 


18.0 


16.5 


19.0 


18.5 


22.5 


21.5 


22.0 


21.5 


21.5 


20.5 


10 


17.0 


16.0 


19.0 


17.0 


19.0 


18.5 


22.5 


21.5 


21.5 


21.5 


21.5 


20.5 


11 


16.5 


16.5 


17.5 


17.0 


19.5 


18.0 


22.5 


21.5 


21.5 


21.0 


21.5 


20.5 


12 


16.5 


16.0 


17.5 


16.5 


19.5 


18.5 


22.5 


21.5 


21.5 


20.5 


21.0 


20.0 


13 


16.5 


16.0 


17.0 


16.5 


19.5 


18.5 


22.5 


21.5 


21.0 


20.5 


21.0 


20.0 


14 


16.5 


16.0 


17.5 


16.5 


20.0 


18.5 


22.5 


21.0 


21.0 


20.0 


21.0 


19.5 


15 


16.5 


16.0 


17.5 


16.5 


20.5 


18.5 


22.5 


20.5 


21.0 


20.0 


20.5 


19.5 


16 


16.5 


16.0 


18.0 


16.5 


20.5 


19.0 


22.0 


20.5 


21.5 


20.0 


20.5 


19.5 


17 


16.5 


15.5 


18.5 


17.0 


21.0 


19.5 


22.0 


20.0 








20.0 


19.0 


18 


17.0 


15.5 


19.0 


17.0 


21.5 


19.5 


22.0 


20.0 








20.0 


19.0 


19 


17.0 


15.5 


18.5 


17.0 


21.5 


20.5 


22.0 


20.0 








19.5 


19.0 


20 


17.0 


15.5 


18.5 


17.5 


22.0 


20.5 


21.5 


20.0 








19.5 


19.0 


21 


17.0 


16.0 


19.0 


18.0 


22.0 


20.5 


21.5 


20.0 








19.5 


19.0 


22 


17.0 


16.0 


19.5 


18.0 


21.0 


20.5 


21.0 


20.0 








19.5 


19.0 


23 


17.0 


16.0 


19.5 


18.5 


20.5 


20.0 


21.5 


20.0 








19.5 


19.0 


24 


17.0 


16.0 


19.5 


19.0 


21.0 


20.0 


21.5 


20.0 








19.5 


19.0 


25 


17.0 


16.0 


19.5 


18.5 


21.5 


20.5 


21.5 


20.5 


22.0 


21.0 


20.5 


19.0 


26 


17.0 


16.5 


19.0 


18.0 


22.0 


21.0 


22.0 


21.0 


23.0 


21.0 


20.5 


19.0 


27 


17.0 


16.5 


18.5 


18.0 


22.0 


20.5 


22.5 


21.0 


23.0 


21.0 


20.5 


19.0 


28 


17.5 


16.5 


19.5 


18.0 


22.0 


20.5 


22.0 


21.0 


23.5 


21.5 


20.5 


19.0 


29 


18.0 


17.0 


19.5 


18.5 


22.0 


20.0 


22.0 


21.0 


23.0 


21.5 


20.0 


19.0 


30 


18.5 


17.0 


19.0 


18.5 


22.5 


20.0 


22.0 


21.0 


23.0 


21.5 


20.5 


19.0 


31 








19.5 


18.5 








23.0 


21.0 


23.0 


21.5 









MONTH 18 . 5 



15.0 



19.5 



16.5 



22.5 



18.0 



23.0 



20.0 



22.5 



19.0 



SAN FRANCISCO BAY 



147 



11162765 SAN FRANCISCO BAY AT SAN MATEO BRIDGE, NEAR FOSTER CITY, CA— Continued 

WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(LOWER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


21.0 


20.5 


18.5 


18.0 


13.5 


13.5 


9.5 


9.5 


10.5 


10.5 


11.5 


11.0 


2 


21.0 


20.5 


18.5 


18.5 


13.5 


13.0 


9.5 


9.0 


10.5 


10.5 


11.5 


11.0 


3 


20.5 


20.0 


18.5 


18.0 


13.0 


13.0 


9.5 


9.0 


11.0 


10.5 


12.5 


11.5 


4 


20.5 


20.0 


18.5 


18.0 


13.0 


13.0 


9.5 


9.0 


11.0 


10.5 


12.5 


11.5 


5 


20.5 


20.0 


18.5 


18.0 


13.0 


12.5 


9.0 


9.0 


11.0 


10.5 


13.0 


12.0 


6 


20.5 


20.0 


18.5 


18.0 


13.0 


12.5 


9.0 


8.5 


11.5 


11.0 


13.0 


12.5 


7 


21.0 


20.0 


18.5 


18.0 


12.5 


12.5 


9.0 


8.5 


11.5 


11.0 


13.5 


12.5 


a 








18.0 


17.5 


12.5 


12.0 


9.0 


8.5 


11.5 


11.0 


14.0 


13.0 


9 








18.0 


17.0 


12.5 


12.0 


9.0 


8.5 


11.5 


11.5 


14.0 


13.5 


10 


21.0 


20.5 


17.5 


16.5 


12.5 


12.5 


9.0 


8.5 


11.5 


11.5 


14.5 


13.5 


11 


21.5 


20.5 


17.5 


16.0 


12.5 


12.5 


8.5 


8.5 


11.5 


11.5 


14.5 


13.5 


12 


21.5 


20.5 


17.0 


16.0 


12.5 


12.0 


8.5 


8.5 


12.0 


11.5 


14.5 


14.0 


13 


21.0 


20.0 


17.0 


16.0 


12.0 


11.5 


8.5 


8.5 


12.0 


11.5 


15.0 


14.5 


lA 


21.0 


19.5 


16.5 


16.0 


12.0 


11.5 


9.0 


8.5 


12.5 


11.5 


15.0 


14.5 


15 


20.5 


19.5 


16.5 


16.0 


11.5 


11.5 


9.0 


9.0 


12.0 


11.5 


15.5 


14.5 


16 


20.0 


19.5 


16.5 


16.0 


11.5 


11.0 


9.0 


9.0 


12.0 


11.5 


15.5 


15.0 


17 


20.0 


19.5 


16.5 


16.0 


11.5 


11.0 


9.0 


9.0 


12.0 


11.5 


15.5 


15.0 


18 


20.0 


19.5 


16.0 


16.0 


11.0 


10.5 


9.5 


9.0 


12.0 


11.5 


15.5 


15.0 


19 


19.5 


19.0 


16.0 


15.5 


11.0 


10.5 


9.5 


9.0 


12.0 


11.5 


15.5 


15.0 


20 


19.5 


19.0 


15.5 


14.5 


11.0 


10.5 


9.5 


9.0 


12.0 


11.5 


16.0 


15.0 


21 


20.0 


19.5 


15.0 


14.5 


11.0 


10.5 


10.0 


9.5 


12.0 


11.5 


16.0 


15.0 


22 


19.5 


19.0 


15.0 


14.5 


10.5 


10.5 


10.0 


9.5 


11.5 


11.5 


16.0 


15.5 


23 


20.0 


19.0 


14.5 


14.0 


10.5 


10.5 


10.0 


9.5 


11.5 


11.5 


16.0 


15.5 


24 


20.0 


19.5 


14.5 


13.5 


10.5 


10.5 


10.0 


9.5 


11.5 


11.0 


16.0 


15.5 


2S 


20.0 


19.0 


14.5 


13.5 


10.5 


10.0 


10.0 


10.0 


11.5 


11.0 








26 


20.0 


19.5 


14.0 


13.5 


10.0 


9.5 


10.0 


10.0 


11.0 


11.0 








27 


20.0 


19.5 


14.0 


13.5 


10.0 


9.5 


10.5 


10.0 


11.0 


11.0 








28 


19.5 


19.0 


14.0 


13.5 


10.0 


9.5 


10.5 


10.0 


11.0 


11.0 


15.0 


15.0 


29 


19.0 


18.5 


14.0 


13.5 


9.5 


9.5 


10.5 


10.0 








15.5 


15.0 


30 


18.5 


18.5 


13.5 


13.5 


9.5 


9.5 


10.5 


10.5 








15.5 


15.0 


31 


18.5 


18.5 








9.5 


9.5 


10.5 


10.5 








15.5 


15.0 



MONTH 



18.5 



13.5 



13.5 



9.5 



10.5 



8.5 



12.5 



10.5 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 


15.5 


15.5 


17.5 


16.5 


19.5 


19.0 


22.5 


20.0 


22.5 


21.0 


22.5 


21.5 


2 


16.0 


15.0 


18.5 


16.5 


20.0 


19.0 


22.5 


19.5 


23.0 


21.5 


22.5 


21.5 


3 


16.0 


15.5 


18.0 


16.5 


20.0 


19.0 


22.0 


19.5 


23.0 


22.0 


22.5 


21.5 


4 


16.0 


15.5 


17.5 


16.0 


19.5 


18.5 


22.0 


19.5 


23.0 


22.5 


22.0 


21.0 


5 


16.0 


15.5 


17.5 


16.0 


19.0 


18.5 


22.0 


20.0 


23.0 


22.5 


22.0 


21.0 


6 


16.0 


15.5 


17.5 


16.5 


19.0 


18.5 


22.0 


20.5 


23.0 


22.0 


21.5 


21.0 


7 


16.5 


15.5 


17.0 


16.5 


19.0 


18.0 


22.0 


20.5 


22.5 


22.0 


21.5 


20.5 


8 


16.5 


15.5 


17.0 


16.0 


19.0 


18.5 


22.0 


21.5 


22.0 


22.0 


21.5 


20.5 


9 


16.5 


16.0 


17.5 


16.0 


19.0 


18.0 


22.0 


21.5 


22.0 


21.5 


21.5 


20.5 


10 


16.5 


16.0 


17.5 


16.5 


19.5 


18.5 


22.0 


21.5 


22.0 


21.5 


21.5 


20.5 


11 


16.5 


16.0 


17.5 


16.5 


19.0 


18.0 


22.0 


21.5 


21.5 


21.0 


21.5 


20.0 


12 


16.5 


16.0 


17.0 


16.5 


19.0 


18.0 


22.0 


21.5 


21.0 


20.5 


21.0 


19.5 


13 


16.0 


16.0 


16.5 


16.0 


19.0 


18.5 


22.5 


21.5 


21.0 


20.5 


21.0 


19.5 


14 


16.0 


16.0 


16.5 


15.5 


20.0 


18.5 


22.5 


21.0 


21.0 


20.0 


21.0 


19.5 


15 


16.5 


15.0 


17.0 


16.0 


20.5 


18.5 


22.5 


20.5 


21.0 


20.0 


20.5 


19.5 


16 


16.5 


15.5 


17.0 


16.5 


20.0 


19.0 


22.0 


20.0 


21.0 


20.0 


20.5 


19.5 


17 


16.0 


14.5 


17.5 


16.5 


20.5 


19.0 


22.0 


19.5 








20.0 


19.0 


18 


15.5 


14.5 


17.5 


17.0 


21.0 


19.5 


22.0 


19.5 








20.0 


19.0 


19 


16.0 


14.5 


18.0 


17.0 


22.0 


20.0 


22.0 


20.0 








19.5 


19.0 


20 


16.0 


15.0 


18.5 


17.5 


22.5 


21.0 


21.5 


20.0 








19.5 


19.0 


21 


16.5 


15.0 


19.0 


18.0 


22.0 


20.0 


21.5 


20.0 








19.5 


19.0 


22 


16.5 


15.5 


19.5 


18.0 


21.0 


19.5 


21.5 


20.0 








19.5 


19.0 


23 


16.5 


15.5 


19.5 


18.5 


20.5 


19.5 


21.0 


20.0 








19.5 


18.5 


24 


16.5 


15.5 


19.5 


18.5 


21.0 


20.0 


21.5 


20.0 








19.5 


18.5 


25 


16.5 


16.0 


19.5 


18.0 


21.5 


20.0 


21.5 


20.5 


22.0 


20.5 


19.5 


18.5 


26 


17.0 


16.0 


19.0 


18.0 


21.5 


20.5 


21.5 


21.0 


22.0 


21.0 


19.5 


19.0 


27 


17.0 


16.5 


18.5 


17.5 


22.0 


21.0 


22.0 


21.0 


22.0 


21.0 


19.5 


19.0 


28 


17.0 


16.0 


19.0 


18.0 


22.0 


20.5 


22.0 


21.0 


22.5 


21.5 


20.0 


19.0 


29 


17.5 


16.5 


19.0 


18.5 


22.0 


20.0 


22.0 


21.0 


22.5 


21.5 


20.0 


19.0 


30 


17.5 


16.5 


19.0 


18.5 


22.5 


19.5 


22.0 


21.0 


22.5 


21.5 


20.0 


19.0 


31 








19.5 


18.5 








22.0 


21.0 


22.5 


21.5 









MONTH 17 . 5 



14.5 



19.5 



15.5 



22.5 



18.0 



22.5 



19.5 



22.5 



18.5 



148 



REDWOOD CREEK BASIN 
11162800 REDWOOD CREEK AT REDWOOD CITY, CA 



LOCATION. --Lat. 37*26'58", long 122*13'57", in Pulgas Grant, San Mateo County. Hydrologic Unit 18050004, at Menlo 
Country Club, on right bank 200 ft upstream from Alameda de Las Pulgas Bridge and 2 . S mi south of Redwood City 
Old Post Office. 

DRAINAGE AREA. --1. 82 roi^. 

PERIOD OF RECORD. --September 1959 to current year. 

REVISED RECORDS. --WSP 1929: Drainage area. 

GAGE. — Water-Stage recorder. Datum of gage is 83.92 ft above sea level. 

REMARKS. — Records fair. Low flow at times affected by return flow from urban irrigation. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 644 ft^/s, Jan. 31, 1963, gage height, 9.36 ft, from rating 
curve extended above 180 ft /s on basis of slope-area measurement of peak flow and computation of peak flow 
through culvert; maximum gage height, 11.55 ft, Nov. 29, 1970 (backwater from culvert trash racks); no flow at 
times . 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 130 ff'/s and maximum (*): 

Discharge Gage height 
Date Time (ft^/s) (ft) Date Time 



Time 

Jan. 1 0530 144 
No flow for many days. 



4.42 



Date 
Jan. 13 



Discharge Gage height 
(ft^/s) (ft) 



1430 



*277 



*5.97 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR CXTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.01 


.06 


.03 


31 


.72 


1.9 


.33 


.34 


.07 


.00 


.00 


.00 


2 


.01 


1.7 


1.3 


4.1 


.74 


1.7 


.28 


.34 


.04 


.00 


.00 


.00 


3 


.01 


4.5 


.52 


1.5 


2.0 


1.8 


.26 


.66 


.03 


.00 


.01 


.00 


4 


.01 


5.0 


.10 


.97 


2.6 


1.3 


.24 


.45 


.41 


.00 


.01 


.00 


S 


.01 


1.6 


.07 


.87 


1.1 


1.2 


.24 


.36 


.23 


.00 


.00 


.00 


6 


.01 


.07 


9.7 


17 


2.2 


1.1 


.24 


.37 


.05 


.00 


.00 


.00 


7 


.01 


.03 


1.6 


26 


1.3 


1.1 


.22 


.26 


.04 


.00 


.00 


.00 


8 


.01 


.03 


2.7 


9.2 


1.3 


.97 


e.20 


.23 


.04 


.00 


.00 


.00 


9 


.01 


.03 


8.7 


3.8 


1.3 


.88 


e.l8 


.20 


.03 


.00 


.00 


.00 


10 


.01 


.02 


8.1 


2.9 


1.3 


.86 


e.l7 


.17 


.03 


.00 


.00 


.00 


11 


.01 


.03 


7.2 


1.8 


1.3 


.84 


e.l2 


.13 


.03 


.00 


.01 


.00 


12 


.01 


.03 


1.2 


29 


1.7 


.81 


e.l2 


.16 


.03 


.00 


.01 


.00 


13 


.01 


.03 


.52 


97 


2.1 


.77 


e.ll 


.11 


.03 


.00 


.01 


.00 


14 


.01 


.03 


.33 


19 


1.7 


.73 


e.ll 


.10 


.01 


.00 


.01 


.00 


IS 


.01 


.03 


.28 


8.6 


1.5 


.67 


e.lO 


.12 


.01 


.00 


.01 


.00 


16 


.01 


.03 


.20 


5.6 


1.3 


1.1 


.38 


.11 


.01 


.00 


.02 


.00 


17 


.01 


.03 


1.2 


19 


2.1 


2.4 


2.4 


.14 


.00 


.00 


.00 


.00 


18 


.01 


.03 


.34 


20 


18 


.82 


.37 


.15 


.01 


.00 


.00 


.00 


19 


.01 


.04 


.22 


6.1 


33 


.70 


.33 


.13 


.00 


.00 


.01 


.00 


20 


.01 


.04 


.19 


25 


11 


.65 


e.2S 


.08 


.00 


.00 


.01 


.00 


21 


.01 


.04 


.17 


17 


5.1 


.60 


e.23 


.07 


.00 


.00 


.00 


.00 


22 


.01 


.07 


.18 


9.1 


3.4 


.60 


e.20 


.14 


.00 


.00 


.00 


.00 


23 


.01 


.03 


.17 


3.9 


8.5 


2.3 


e.l8 


.18 


.00 


.00 


.00 


.00 


24 


.01 


.03 


.15 


2.8 


3.8 


1.4 


e.l8 


.26 


.00 


.00 


.00 


.00 


25 


.01 


.03 


.15 


1.6 


3.8 


3.5 


e.l8 


.83 


.00 


.00 


.02 


.00 


26 


.01 


.03 


.13 


1.0 


20 


6.8 


.30 


.14 


.00 


.00 


.01 


.00 


27 


.01 


.03 


.14 


.93 


4.1 


2.6 


.32 


.12 


.00 


.00 


.00 


.00 


28 


.01 


.03 


21 


.86 


2.6 


.96 


.32 


.05 


.00 


.00 


.00 


.00 


29 


7.6 


.03 


18 


.86 





.50 


.36 


.05 


.00 


.00 


.00 


.00 


30 


.48 


.03 


6.3 


.86 





.29 


.35 


.11 


.00 


.00 


.00 


.00 


31 


.06 





1.5 


.84 





.34 





.37 





.00 


.00 





TOTAL 


8.42 


13.71 


92.39 


368.19 


139.56 


42.19 


9.27 


6.93 


1.10 


0.00 


0.14 


0.00 


MEAN 


.27 


.46 


2.98 


11.9 


4.98 


1.36 


.31 


.22 


.037 


.000 


.005 


.000 


MAX 


7.6 


5.0 


21 


97 


33 


6.8 


2.4 


.83 


.41 


.00 


.02 


.00 


MIN 


.01 


.02 


.03 


.84 


.72 


.29 


.10 


.05 


.00 


.00 


.00 


.00 


AC-FT 


17 


27 


183 


730 


277 


84 


18 


14 


2.2 


.00 


.3 


.00 


e Estimated. 

























REDWOOD CREEK BASIN 



140 



11162800 REDWOOD CREEK AT REDWOOD CITY. CA —Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



.23 
2.93 
1963 
.000 
1960 



.81 
4.84 
1974 
.003 
1960 



SU^»^ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



1.68 
7.44 
1971 
.052 
1960 



3.70 
13.0 
1967 
.065 
1991 



3.42 
13.9 
1986 
.11 
1977 



FOR 1992 CALENDAR YEAR 



398.12 
1.09 






47 
.01 
.01 


Feb 
Jul 
Jul 


12 

1 
14 


790 

I.a 

.07 
.01 







2.52 
11.5 
1983 
.18 
1988 



.94 
4.90 
1982 
.015 
1977 



.22 
1.26 
1983 
.003 
1962 



FOR 1993 WATER YEAR 

681.90 
1.87 



97 

.00 
.00 
277 
5.97 
1350 
3.8 
.10 
.00 



Jan 13 

Jun 17 

Jun 19 

Jan 13 

Jan 13 



.086 
.32 
1983 
.000 
1961 



JUL 

.040 
.15 
1983 
.000 
1961 



AUG 

.031 
.10 
1983 
.000 
1961 



SEP 

.038 
.17 
1982 
.000 
1961 



WATER YEARS 1960 - 1993 



1.13 








3.67 






1983 


.096 






1961 


211 


Jan 


21 


1967 


.00 


Oct 


1 


1959 


.00 


Oct 


1 


1959 


644 


Jan 


31 


1963 


11.55 


Nov 


29 


1970 


821 








1.6 








.10 








.00 









150 



SAN FRAHCISQUITO CREEK BASIN 
11164500 SAN FRANCISQUITO CREEK AT STANFORD UNIVERSITY, CA 



LOCATION. — Lat 37*25'2*", long 122*11' 18", in San Francisquito Grant, Santa Clara County, Hydrologic Unit 
18050003, at golf course on right bank 1.1 mi downstream from Los Trancos Creek, 1.1 mi west of Stanford 
University Post Office, and 5 mi downstream from Searsvllle Lake. 

DRAINAGE AREA. --37.* mi^. 

PERIOD OF RECORD. --October 1930 to September ISAl, October 1950 to current year. Monthly discharge only for some 
periods, published in WSP 131S-B. 

GAGE. --Water-stage recorder and concrete control. Datum of gage is 115.75 ft above sea level. Recording rain 
gage at 345 Middlefield Road in Menlo Park, 2.5 mi northeast of gage. 

REMARKS. — No estimated daily discharges. Records good. Flow slightly regulated by Searsvllle Lake, capacity, 
952 acre-ft. Diversions of about 800 acre-ft each year upstream from station to Los Trancos and Lagunlta 
Canals for irrigation on Stanford University Campus downstream from station. Low flow affected by wastewater 
from Stanford Linear Accelerator. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 5,560 ft^/s, Dec. 22, 1955, gage height, 13.60 ft; no flow at 
times. 



EXTRQIES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 700 ft /s and maximum (*): 

Discharge Gage height Discharge Gage he 

Date Time (ft^/s) (ft) Date Time (ft^/s) (ft) 



Jan. 


13 


0715 


*3,010 


*8.51 


Jan. 


20 


2000 


1,200 


5.07 



Feb. 


19 


2200 


1,070 


4.80 


Feb. 


26 


0545 


786 


4.15 



Minimum daily, 0.08 ft^/s, Oct. 1. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



1 


.08 


2 


.11 


3 


.13 


4 


.11 


5 


.12 


6 


.11 


7 


.28 


8 


.28 


9 


.31 


10 


.32 


11 


.42 


12 


.43 


13 


.42 


14 


.39 


IS 


.39 


16 


.30 


17 


.34 


18 


.51 


18 


.52 


20 


.54 


21 


.80 


22 


.78 


23 


.82 


24 


.66 


25 


.35 


26 


.56 


27 


.66 


28 


.76 


29 


12 


30 


2.9 


31 


.72 


TOTAL 


27.15 


MEAN 


.88 


MAX 


12 


MIN 


.08 


AC -FT 


54 


a 


1.46 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



a Precipitation, 



.31 


.62 


220 


20 


78 


34 




7.4 


5.3 


.89 


.23 


2.2 


56 


13 


67 


29 




6.9 


4.5 


.85 


.21 


2.9 


24 


12 


64 


26 




6.4 


4.2 


.92 


.15 


.80 


16 


18 


59 


27 




6.5 


4.9 


.83 


.18 


.42 


12 


22 


51 


27 




5.3 


6.2 


.88 


.44 


23 


45 


20 


44 


25 




4.9 


5.2 


.95 


.69 


10 


362 


21 


40 


20 




4.5 


4.9 


.99 


.50 


2.9 


182 


33 


37 


17 




4.1 


4.6 


.93 


.34 


28 


71 


58 


34 


14 




4.0 


4.3 


.93 


.31 


32 


44 


38 


30 


13 




3.8 


3.6 


.89 


.36 


31 


29 


48 


26 


13 




3.5 


4.7 


.83 


.38 


8.3 


119 


32 


25 


12 




3.9 


4.3 


.78 


.37 


3.2 


1620 


27 


24 


12 




4.2 


3.6 


.72 


.33 


2.4 


463 


24 


23 


11 




4.1 


3.1 


.63 


.24 


2.2 


178 


22 


21 


11 




4.1 


2.7 


.59 


.26 


1.9 


138 


21 


21 


11 




4.2 


2.7 


.57 


.28 


3.1 


268 


25 


37 


28 




4.0 


2.3 


.50 


.26 


3.1 


344 


91 


31 


26 




4.4 


1.9 


.48 


.31 


1.6 


147 


630 


27 


18 




4.4 


1.5 


.41 


.40 


1.6 


435 


465 


24 


14 




4.3 


1.4 


.49 


.36 


1.5 


440 


184 


21 


13 




4.1 


1.4 


.50 


.61 


1.5 


404 


123 


19 


11 




3.8 


1.3 


.46 


.51 


1.5 


154 


250 


30 


11 




3.7 


1.2 


.47 


.54 


1.4 


96 


167 


45 


12 




4.0 


1.1 


•*5 


.58 


1.4 


70 


122 


38 


11 




5.5 


1.0 


.41 


.55 


1.4 


57 


428 


143 


10 




5.0 


1.0 


.52 


.63 


1.4 


56 


157 


79 


8. 


7 


5.4 


.92 


.57 


.73 


58 


41 


103 


67 


8. 


5 


5.5 


.89 


.60 


.70 


82 


56 





44 


5. 


9 


4.5 


1.0 


.41 


.61 


49 


34 





33 


6. 


2 


4.2 


.90 


.34 





27 


28 





31 


— 


•- 


6.7 





.23 


.37 


387.54 


6209 


3174 


1313 


485. 


3 


147.3 


86.61 


20.02 


.41 


12.5 


200 


113 


42.4 


16. 


2 


4.75 


2.89 


.65 


.73 


82 


1620 


630 


143 


34 


7.4 


6.2 


.99 


.15 


.42 


12 


12 


19 


5. 


9 


3.5 


.89 


.23 


25 


769 


12320 


6300 


2600 


963 


292 


172 


40 


1.04 


4.97 


6.79 


3.38 


3.13 


0.20 


0.17 


0.14 





in inches . 



















AUG 



SEP 



.19 


.21 


.16 


.23 


.15 


.16 


.22 


.13 


.25 


.14 


.28 


.17 


.30 


.17 


.32 


.14 


.27 


.14 


.27 


.19 


.32 


.22 


.34 


.24 


.33 


.25 


.34 


.20 


.35 


.29 


.34 


.28 


.25 


.29 


.17 


.40 


.22 


.31 


.24 


.38 


.28 


.30 


.31 


.31 


.18 


.32 


.13 


.28 


.13 


.26 


.12 


.26 


.12 


.20 


.16 


.24 


.26 


.28 


.22 


.25 


.22 





.44 


7.24 


.24 


.24 


.35 


.40 


.12 


.13 


15 


14 









SAH FRANCISQUITO CREEK BASIN 
11164500 SAH FRANCISQUITO CREEK AT STANFORD UNIVERSITY, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1931 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



151 



SEP 



MEAN .96 5.91 


23.9 


54.4 


68.7 


50.4 


25.6 


2.94 


.70 


.33 


.22 


.26 


MAX 28.2 91.9 


220 


250 


409 


315 


232 


39.5 


8.22 


3.30 


1.61 


2.11 


(WY) 1963 1951 


1956 


1952 


1986 


1983 


1958 


1983 


1983 


1983 


1983 


1973 


MIN .000 .000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 1931 1931 


1931 


1931 


1931 


1931 


1931 


1931 


1931 


1931 


1931 


1931 


SUhMARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




WATER YEARS 1931 - 


1993 


ANNUAL TOTAL 




4455.25 






11876.97 












ANNUAL MEAN 




12.2 






32.5 






19.3 






HIGHEST ANNUAL MEAN 
















83.4 




1983 


LOWEST ANNUAL MEAN 
















.000 




1931 


HIGHEST DAILY MEAN 




796 


Feb 12 




1620 


Jan 13 




2650 


Dec 23 


1955 


LOWEST DAILY MEAN 




.04 


May 18 




.08 


Oct 1 




.00 


Oct 1 


1930 


ANNUAL SEVEN-DAY MINIMUM 




.10 


Aug 18 




.13 


Oct 1 




.00 


Oct 1 


1930 


INSTANTANEOUS PEAK FLOW 










3010 


Jan 13 




5560 


Dec 22 


1955 


INSTANTANEOUS PEAK STAGE 










8.51 


Jan 13 




13.60 


Dec 22 


1955 


ANNUAL RUNOFF (AC-FT) 




8840 






23560 






13970 






10 PERCENT EXCEEDS 




25 






61 






31 






50 PERCENT EXCEEDS 




.74 






2.7 






.34 






80 PERCENT EXCEEDS 




.14 






.23 






.00 







152 



MATADERO CREEK BASIN 
11166000 MATADERO CREEK AT PALO ALTO. CA 



LOCATION. --Lat 37*25'18", long 122'08'0<i", in Rincon de San Francisquito Grant, Santa Clara County, Hydrologic 
Unit 18050003, on right bank on Ash Street 150 ft upstream from Lambert Avenue Bridge and 2.1 mi southeast of 
Palo Alto Post Office. 

DRAINAGE AREA.— 7.26 mi 2. 

PERIOD OF RECORD. --July 1952 to April 1991, June 1992 to current year. 

REVISED RECORDS. --WDR CA-80-2: 1971, 1973-74, 1978, 1971-75(P). WDR CA-82-2: 1973-7ii(P), 1978(P). 

GAGE. --Water-stage recorder. Datum of gage is 17.01 ft above sea level. Prior to Sept. 25, 1958, at site ISO ft 
downstream at different datum. Prior to Apr. 9, 1991 at same site, different datum. 

REMARKS. --No estimated daily discharges. Records fair. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 1,500 ft^/s, Jan. 24, 1983, gage height, 6.51 ft, datum then 
In use; maximum gage height, 9.88 ft, Dec. 23, 1955, site and datum then in use (backwater from culvert); no 
flow at times . 



EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 200 ff'/s and maximum (*) 

Discharge Gage height 
Date Time (ft^/s) (ft) Date Time 



Jan. 


13 


0445 


389 


4.97 


Feb. 


26 


0300 


*474 


*5.26 



Date 
Feb. 19 



Discharge Gage height 
(ft^/s) (ft) 



0600 



338 



Minimum daily, 0.03 ft^/s, Nov. 5. 



4.79 



DISCHARGE, 



DAY 



OCT 



CUBIC FEET PER SECOND, WATER YEAR (XTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.42 


.07 


.24 


51 


1.7 


5.7 


3.1 


.66 


.43 


.16 


.30 


.14 


2 


.40 


.11 


3.8 


6.4 


1.7 


5.1 


2.8 


.52 


.26 


.24 


.28 


.18 


3 


.34 


.08 


1.2 


3.8 


1.8 


5.7 


2.7 


.52 


.26 


.18 


.17 


.17 


4 


.23 


.07 


.23 


3.2 


1.7 


3.6 


2.7 


.60 


1.0 


.21 


.17 


.14 


5 


.09 


.03 


.25 


3.9 


1.7 


3.2 


2.0 


.60 


.63 


.18 


.17 


.14 


6 


.13 


.05 


26 


21 


1.3 


3.1 


1.9 


.42 


.19 


.11 


.17 


.15 


7 


.13 


.06 


4.9 


41 


3.7 


3.0 


1.9 


.35 


.17 


.18 


.18 


.14 


8 


.09 


.54 


.76 


13 


6.0 


2.8 


1.7 


.31 


.10 


.24 


.18 


.12 


9 


.15 


.11 


4.9 


6.2 


4.0 


2.7 


1.7 


.26 


.07 


.24 


.19 


.13 


10 


.13 


.05 


16 


5.6 


2.5 


2.6 


1.6 


.14 


.11 


.27 


.18 


.14 


11 


.16 


.16 


4.6 


3.7 


8.7 


2.5 


1.5 


.11 


.10 


.28 


.15 


.17 


12 


.16 


.06 


.77 


45 


2.1 


2.4 


1.5 


.14 


.10 


.26 


.22 


.16 


13 


.11 


.08 


.34 


161 


1.8 


2.3 


1.4 


.24 


.11 


.11 


.26 


.15 


14 


.09 


.08 


.32 


28 


1.7 


2.3 


1.4 


.24 


.12 


.17 


.27 


.17 


IS 


.08 


.10 


.36 


15 


2.3 


2.1 


1.4 


.24 


.15 


.20 


.29 


.11 


16 


.44 


.11 


.42 


8.8 


1.8 


2.5 


1.4 


.24 


.16 


.30 


.28 


.13 


17 


.33 


.10 


2.2 


49 


2.3 


3.6 


3.5 


.19 


.15 


.21 


.27 


.18 


18 


.86 


.11 


.50 


52 


36 


2.1 


1.9 


.19 


.11 


.18 


.19 


.17 


19 


.53 


.16 


.43 


9.2 


182 


2.1 


1.4 


.15 


.14 


.17 


.15 


.15 


20 


.76 


.13 


.45 


17 


50 


2.1 


1.3 


.14 


.14 


.19 


.13 


.18 


21 


1.3 


.12 


.45 


24 


13 


2.2 


1.1 


.11 


.13 


.18 


.15 


.14 


22 


.65 


.22 


.46 


18 


11 


2.0 


1.1 


.12 


.16 


.19 


.15 


.16 


23 


.79 


.14 


.48 


6.3 


32 


15 


1.2 


.11 


.14 


.21 


.18 


.15 


24 


.99 


.18 


.49 


4.6 


4.3 


6.1 


1.1 


.93 


.14 


.22 


.13 


.13 


2S 


.79 


.15 


.48 


3.8 


5.3 


13 


1.0 


.70 


.13 


.20 


.12 


.13 


26 


1.0 


.15 


.52 


3.1 


116 


45 


1.0 


.26 


.11 


.20 


.12 


.14 


27 


.72 


.17 


.56 


2.8 


12 


11 


1.0 


1.0 


.16 


.20 


.15 


.15 


28 


1.4 


.18 


23 


2.5 


6.9 


4.2 


1.2 


.51 


.18 


.20 


.18 


.13 


29 


6.4 


.23 


28 


2.1 





2.9 


.79 


.33 


.13 


.18 


.13 


.14 


30 


.31 


.23 


10 


1.9 





2.7 


.74 


.28 


.16 


.19 


.27 


.15 


31 


.09 





3.8 


1.8 





4.2 





1.9 





.21 


.13 





TOTAL 


20.07 


4.03 


136.91 


634.7 


515.3 


169.8 


49.03 


12.51 


5.94 


6.26 


5.91 


4.44 


MEAN 


.65 


.13 


4.42 


20.5 


18.4 


5.48 


1.63 


.40 


.20 


.20 


.19 


.15 


MAX 


6.4 


.54 


28 


181 


182 


45 


3.5 


1.9 


1.0 


.30 


.30 


.18 


MIN 


.08 


.03 


.23 


1.8 


1.3 


2.0 


.74 


.11 


.07 


.11 


.12 


.11 


AC-FT 


40 


8.0 


272 


1260 


1020 


337 


97 


25 


12 


12 


12 


8.8 



MATADERO CREEK BASIN 



153 



11166000 MATADERO CREEK AT PALO ALTO, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1953 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.43 


1.51 


3.44 


7.39 


7.24 


4.84 


2.10 


.40 


.20 


.14 


.14 


.16 


MAX 


2.9S 


9.82 


24.3 


32.3 


38.2 


37.8 


25.2 


4.39 


1.90 


.66 


.70 


.66 


(WY) 


1973 


1973 


1956 


1983 


1973 


1983 


1958 


1983 


1983 


1983 


1983 


1983 


MIN 


.000 


.000 


.000 


.016 


.014 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1953 


1953 


1954 


1954 


1964 


1959 


1954 


1953 


1953 


1953 


1953 


1953 



SWtlARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1993 WATER YEAR 



WATER YEARS 1953 - 1993 



1564.90 






4.29 






182 


Feb 


19 


.03 


Nov 


5 


.07 


Nov 


1 


474 


Feb 


26 


5.26 


Feb 


26 


3100 






6.3 






.31 






.12 







2.34 








10.9 






1983 


.062 






1954 


335 


Dec 


23 


1955 


.00 


Oct 


1 


1952 


.00 


Oct 


1 


1952 


1500 


Jan 


24 


1983 


9.88 


Dec 


23 


1955 


1700 








2.7 








.13 








.00 









DAY 

1 
2 

3 
4 
5 

6 
7 
8 
9 
10 

11 
12 
13 
14 
IS 

16 
17 
18 
19 
20 

21 
22 
23 
24 
25 

26 
27 
28 
29 
30 
31 

TOTAL 

MEAN 

MAX 

MIN 

AC-FT 



DISCHARGE, CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1991 TO SEPTEMBER 1992 

DAILY MEAN VALUES 
(NOT PREVIOUSLY PUBLISHED) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 






.00 


.03 


.00 





.00 


.03 


.00 





.00 


.01 


.00 


.03 


.00 


.03 


.00 


.06 


.00 


.01 


.00 


.08 


.00 


.03 


.00 


.13 


.00 


.02 


.00 


.05 


.01 


.03 


.00 


.03 


.00 


.04 


.01 


.03 


.01 


.03 


.00 


.03 


.12 


.06 


.00 


.05 


.20 


.04 


.00 


.03 


.15 


.09 


.01 


.05 


.12 


.10 


.01 


.02 


.09 


.00 


.02 


.03 


.10 


.00 


.03 


.02 


.07 


.00 


.02 


.02 


.07 


.00 


.02 


.02 


.17 


.00 


.01 


.05 


.08 


.00 


.03 


.06 


.05 


.00 


.01 


.02 


.04 


.00 


.01 


.03 


.06 


.00 


.02 


.02 


.04 


.00 


.01 


.03 


.07 


.00 


.01 


.02 


.04 


.00 


.00 


.03 


.08 


.00 


.05 


.02 


.03 


.00 


.04 


.07 


.00 


.02 


.15 


.01 


.02 


.00 


.20 





.02 


.00 








1.64 


0.57 


0.66 





.053 


.018 


.022 





.20 


.10 


.20 





.00 


.00 


.00 





3.3 


1.1 


1.3 



154 



GUADALUPE RIVER BASIN 
11169000 GUADALUPE RIVER AT SAN JOSE, CA 



LOCATION.— Lat 37"20'0*", long 121*53'5*", Santa Clara County, Hydrologic Unit 18050003, on right bank 150 ft 

upBtream from St. John Street Bridge, one block below Santa Clara Avenue, and 100 ft downstream from Los Gatos 
Creek . 

DRAINAGE AREA.— 146 mi^. 

PERIOD OF RECORD. --October 1929 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. Prior to 1945, published as Guadalupe Creek at San Jose. 
CHEMICAL DATA: Water years 1979-91. 
SEDIMENT DATA; Water years 1985-89. 

REVISED RECORDS.— WSP 1315-B: 1943(M), 1945(M), 1949(M) . WSP 1929: Drainage area. 

GAGE. --Water-stage recorder and concrete control. Datum of gage is 72.00 ft above sea level. 

REMARKS. --No estimated daily discharges. Records good. Flow regulated by Lexington Reservoir 12 mi upstream and 
by Calero (station 11166740), Almaden, and Guadalupe Reservoirs, and Lake Elsman (combined usable capacity, 
about 42,000 acre-ft), with water released during suimer for percolation in spreading basins on tributaries. 
Transbasin diversions from San Luis Reservoir (part of San Felipe Project), from the South Bay Aqueduct, and 
from Betch Hetchy Aqueduct during the current year amounted to 57,900 acre-ft, 58,200 acre-ft, and 
54,600 acre-ft, respectively. Upstream diversions by San Jose Water Works for urban use amounted to 
14,000 acre-ft during the current year. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 9,150 ft^/s, Apr. 2, 1958, gage height, 16.55 ft; no flow 
several days in most years. 

EXTREMES FOR CURRENT YEAR . —Maximum discharge, 4,920 ft^/s, Jan. 13, gage height, 8.66 ft; 
no flow, Oct. 22-26. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.39 


1.1 


.94 


957 


25 


437 


S3 


2.6 


3.7 


2.5 


1.9 


1.6 


2 


.45 


1.2 


23 


71 


22 


339 


33 


2.7 


2.7 


2.2 


1.8 


1.6 


3 


.48 


2.6 


53 


21 


22 


292 


30 


2.7 


2.6 


2.2 


2.9 


1.6 


4 


.52 


2.2 


2.7 


11 


22 


237 


29 


2.2 


8.2 


2.2 


2.4 


1.6 


S 


.65 


.62 


1.3 


6.0 


17 


160 


27 


2.0 


52 


2.2 


2.2 


1.6 


6 


.74 


.59 


248 


132 


16 


135 


25 


2.4 


20 


2.3 


2.3 


1.5 


7 


1.2 


.59 


151 


635 


52 


120 


20 


4.4 


17 


2.3 


2.3 


1.6 


8 


.61 


.65 


14 


132 


251 


108 


15 


2.3 


8.6 


2.2 


2.3 


1.4 


9 


.S8 


.69 


15 


59 


109 


94 


10 


2.2 


6.5 


2.1 


2.3 


4.7 


10 


.58 


.71 


359 


123 


34 


87 


7.5 


3.0 


5.4 


2.1 


2.4 


5.3 


11 


.59 


.81 


105 


24 


117 


80 


4.6 


4.1 


4.6 


2.1 


2.2 


4.7 


12 


.59 


.84 


25 


314 


36 


75 


4.8 


4.1 


3.5 


2.1 


2.0 


4.6 


13 


.63 


.74 


7.8 


2380 


29 


68 


5.5 


4.6 


3.0 


2.4 


1.9 


4.5 


lA 


.64 


.59 


4.8 


923 


26 


66 


3.2 


4.1 


2.8 


2.2 


1.9 


3.2 


IS 


.65 


.61 


15 


522 


22 


60 


4.2 


3.5 


2.7 


2.3 


1.9 


2.9 


16 


.69 


.67 


6.0 


345 


19 


58 


2.5 


3.5 


3.1 


2.7 


1.8 


2.4 


17 


.75 


.66 


14 


955 


62 


66 


33 


5.8 


2.6 


2.8 


1.8 


1.9 


18 


.76 


.65 


7.9 


860 


734 


58 


8.0 


4.5 


2.3 


2.9 


1.8 


1.8 


19 


.84 


.96 


.91 


345 


1840 


50 


5.3 


3.7 


2.3 


3.4 


1.8 


1.7 


20 


.64 


1.1 


.46 


238 


1250 


41 


3.1 


3.4 


2.3 


4.3 


1.8 


1.8 


21 


.27 


.94 


.33 


375 


715 


39 


2.6 


3.2 


2.2 


3.5 


1.7 


1.6 


22 


.00 


.60 


.39 


615 


527 


37 


2.5 


3.1 


2.4 


4.3 


1.6 


1.6 


23 


.00 


.20 


1.1 


345 


545 


158 


2.5 


2.9 


2.4 


3.9 


1.6 


1.5 


24 


.00 


.94 


1.1 


215 


402 


242 


2.5 


13 


2.3 


4.0 


1.6 


1.5 


25 


.00 


.80 


1.1 


147 


421 


162 


2.4 


16 


2.2 


4.3 


2.1 


1.5 


26 


.00 


.90 


1.0 


105 


1520 


623 


2.5 


4.9 


2.2 


3.6 


2.1 


1.5 


27 


.76 


.96 


1.0 


50 


717 


232 


2.5 


2.9 


1.8 


2.8 


1.6 


1.5 


28 


2.2 


.98 


480 


36 


540 


143 


2.5 


2.5 


1.9 


2.7 


1.6 


1.5 


29 


7.0 


1.0 


243 


33 





118 


2.5 


2.1 


2.2 


10 


1.7 


1.5 


30 


6.4 


1.0 


38 


32 





97 


2.6 


2.2 


2.2 


5.0 


1.9 


1.7 


31 


3.3 





6.7 


28 





85 





7.1 





2.2 


1.7 


~~~ 


TOTAL 


32.91 


26.90 


1828.53 


11034.0 


10092 


4567 


348.8 


127.7 


177.7 


95.8 


60.9 


67.4 


MEAN 


1.06 


.90 


59.0 


356 


360 


147 


11.6 


4.12 


5.92 


3.09 


1.96 


2.25 


MAX 


7.0 


2.6 


480 


2380 


1840 


623 


53 


16 


52 


10 


2.9 


5.3 


MIN 


.00 


.20 


.33 


6.0 


16 


37 


2.4 


2.0 


1.8 


2.1 


1.6 


1.4 


AC-FT 


65 


53 


3630 


21890 


20020 


9060 


692 


253 


352 


190 


121 


134 



GUADALUPE RIVER BASIN 



155 



11169000 GUADALUPE RIVER AT SAN JOSE, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1930 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


5.81 


14.1 


38.5 


85.5 


145 


121 


65.5 


8.07 


2.61 


2.47 


2.26 


2.68 


MAX 


129 


123 


311 


683 


1080 


1165 


847 


219 


23.5 


23.4 


22.3 


31.0 


(WY) 


1963 


1984 


1932 


1952 


1938 


1983 


1982 


1983 


1984 


1984 


1984 


1983 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1930 


1930 


1930 


1931 


1930 


1931 


1930 


1930 


1930 


1930 


1930 


1930 



SUMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FC}R 1992 CALENDAR YEAR 

9554.05 
26.1 



1500 Feb 12 
.00 Aug 25 
.00 Aug 25 



18950 
21 



FOR 1993 WATER YEAR 



WATER YEARS 1930 - 1993 



.78 
.00 



28459.64 






78.0 






2380 


Jan 


13 


.00 


Oct 


22 


.13 


Oct 


20 


4920 


Jan 


13 


8.66 


Jan 


13 


56450 






234 






2.8 






.70 







40.6 








270 






1983 


.000 






1931 


6660 


Fob 


19 


1986 


.00 


Oct 


1 


1929 


.00 


Oct 


1 


1929 


9150 


Apr 


2 


1958 


16.55 


Apr 


2 


1958 


29400 








41 








.32 








.00 









156 



GUADALUPE RIVER BASIN 
11169500 SARATOGA CREEK AT SARATOGA, CA 



LOCATION. --Lat 37'15'16", long 122"C2'18", In Quito Grant, Santa Clara County, Hydrologic Unit 18050003, on right 
bank on upstream side of private road bridge, 0.5 ml southwest of Saratoga, and 0.7 mi downstream from 
diversion dam. 

DRAINAGE AREA. --9. 22 mi^. 



PERIOD OF RECORD. --October 1933 to current year. Prior to October 1951, published as Campbell Creak at Saratoga. 
CHEMICAL DATA: Water years 1972 to December 1972. 

REVISED RECORDS. --WSP 1««5: 1940, 1952(M). WSP 1929: Drainage area. 

GAGE. --Water-stage recorder, crest-stage gage, and concrete control. Elevation of gage is 500 ft above sea 
level, from topographic map. Prior to Dec. 6, 1968, at site AO ft downstream at different datum. 

RQIARKS.--N0 estimated daily discharges. Records fair. Water is diverted for municipal use by San Jose Water 
Works at diversion dam upstream from station. Low flows partially regulated by Lake McKenzie 8 mi upstream, 
usable capacity, 18'i acre-ft. 



EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 2,730 ft^/s, Dec. 22, 1955, gage height. 6.40 
datum then In use, from rating curve extended above 510 ft /s on basis of slope-area measurem 



no flow at times. 



ft, site and 
ement of peak flow; 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 110 ff'/s and maximum (*): 



Date 



Time 



Dec. 10 2000 
Jan. 1 0815 
Jan. 13 0500 



Discharge 
(ft^/s) 



141 

156 

*665 



ige 


height 


(ft) 


3 


.65 


3 


.73 


*5 


.30 



Date 



Jan. 21 
Feb. 19 



Time 



2230 
0615 



Discharge 
(ft^/s) 



263 
347 



Gage height 
(ft) 

4.22 
4. SO 



Minimum dally, 0.18 ft^/s, Oct. 12. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.24 


.59 


.81 


70 


16 


54 


14 


4.4 


4.4 


2.3 


1.4 


1.2 


2 


.22 


.56 


1.7 


30 


13 


48 


11 


4.0 


4.3 


2.2 


1.3 


1.1 


3 


.22 


.56 


2.6 


16 


12 


43 


11 


3.4 


4.2 


2.2 


1.2 


1.1 


4 


.22 


.56 


1.8 


10 


8.2 


37 


10 


3.4 


4.6 


2.0 


1.3 


1.2 


S 


.24 


.56 


1.8 


10 


7.8 


33 


10 


3.8 


4.5 


2.1 


1.3 


1.2 


6 


.20 


.56 


12 


19 


7.2 


30 


8.8 


3.1 


4.4 


2.1 


1.4 


1.2 


7 


.19 


.56 


7.5 


59 


8.6 


27 


8.1 


3.0 


4.2 


2.0 


1.3 


1.1 


8 


.22 


.56 


3.8 


39 


12 


25 


7.9 


3.0 


4.1 


2.0 


1.3 


.91 


9 


.21 


.61 


19 


23 


11 


23 


7.4 


3.0 


3.8 


1.9 


1.4 


.89 


10 


.19 


.58 


50 


20 


9.8 


21 


7.2 


2.9 


3.6 


1.8 


1.4 


.95 


11 


.19 


.60 


28 


13 


14 


21 


7.0 


3.2 


3.5 


1.9 


1.3 


.94 


12 


.18 


.63 


14 


32 


10 


19 


6.9 


3.1 


3.5 


1.9 


1.3 


.88 


13 


.20 


.63 


8.7 


314 


8.7 


17 


6.6 


3.3 


3.4 


1.9 


1.3 


.82 


14 


.22 


.63 


5.9 


124 


7.6 


16 


6.3 


3.0 


3.3 


1.8 


1.3 


.84 


15 


.23 


.63 


4.3 


73 


7.0 


15 


6.0 


2.9 


3.2 


1.9 


1.4 


.91 


IB 


.23 


.63 


3.7 


57 


6.5 


15 


6.9 


3.7 


3.2 


1.8 


1.2 


.78 


17 


.24 


.63 


4.0 


76 


30 


17 


10 


4.2 


3.0 


1.8 


1.2 


.75 


18 


.27 


.66 


3.1 


89 


111 


16 


7.5 


4.1 


3.0 


1.8 


1.2 


.89 


19 


.34 


.69 


2.6 


60 


239 


15 


6.2 


4.1 


3.0 


1.6 


1.2 


.83 


20 


.36 


.77 


2.5 


108 


149 


14 


6.2 


4.3 


2.9 


1.6 


1.4 


.76 


21 


.31 


.75 


2.3 


149 


104 


13 


5.9 


4.1 


2.8 


1.6 


1.3 


.73 


22 


.31 


.81 


2.1 


147 


84 


12 


4.5 


4.1 


2.6 


1.5 


1.2 


.62 


23 


.31 


.81 


2.1 


86 


132 


15 


4.1 


4.2 


2.6 


1.5 


1.2 


.64 


24 


.31 


.81 


2.1 


64 


94 


18 


4.2 


4.4 


2.6 


1.4 


1.1 


.60 


2S 


.35 


.81 


2.1 


45 


74 


16 


3.8 


4.4 


2.5 


1.5 


1.1 


.59 


26 


.36 


.81 


2.1 


34 


114 


21 


3.4 


4.4 


2.4 


1.6 


1.1 


.53 


27 


.36 


.81 


2.1 


27 


80 


22 


3.4 


4.4 


2.4 


1.5 


1.1 


.53 


28 


.36 


.81 


28 


25 


63 


18 


3.5 


4.3 


2.3 


1.6 


1.0 


.57 


29 


4.0 


.81 


34 


26 





15 


3.6 


4.1 


2.3 


1.5 


1.1 


.62 


30 


.86 


.81 


17 


21 





14 


3.6 


4.2 


2.3 


1.4 


1.2 


.63 


31 


.67 





9.8 


19 





13 





4.5 





1.4 


1.2 





TOTAL 


12.81 


20.24 


281.51 


1885 


1433.4 


683 


205.0 


117.0 


98.9 


55.2 


38.7 


25.31 


MEAN 


.41 


.67 


9.08 


60.8 


51.2 


22.0 


6.83 


3.77 


3.30 


1.78 


1.25 


.84 


MAX 


4.0 


.81 


50 


314 


239 


54 


14 


4.5 


4.6 


2.3 


1.4 


1.2 


MIN 


.18 


.56 


.81 


10 


6,5 


12 


3.4 


2.9 


2.3 


1.4 


1.0 


.53 


AC-FT 


25 


40 


558 


3740 


2840 


1350 


407 


232 


196 


109 


77 


50 


a 











65 


75 


132 


167 


87 














a Diversion, 


in acre- 


■feet, for 


municip 


al use, pr( 


Dvided by 


' San Jose 


Water Work: 


5. 









GUADALUPE RIVER BASIN 



157 



11169500 SARATOGA CREEK AT SARATOGA, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1934 - 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

.88 
17.5 
1963 
.000 
1950 



NOV 

2.77 
25.5 
1951 
.037 
1949 



SUNMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 

ANNUAL MEAN ADJUSTED a 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

9.30 
83.2 
1956 
.25 
1957 



JAN 

21.0 
87.8 
1952 
.31 
1976 



FEB 

29.5 

135 
1986 
.086 
1964 



FOR 1992 CALENDAR YEAR 



1895.61 
5.18 
6.00 






163 
.11 
.13 


Feb 
Aug 
Aug 


12 
24 

19 


3760 
12 

1.1 
.21 







1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



22.5 
114 

1983 
.32 

1972 



14.0 
131 

1982 
.24 

1972 



3.76 
35.7 
1983 
.065 
1959 



FOR 1993 WATER YEAR 

4856.07 
13.3 
14.0 



314 

.18 
.20 
665 
5.30 
9630 
31 
3.0 
.56 



Jan 13 

Oct 12 

Oct 6 

Jan 13 

Jan 13 



1.27 
6.97 
1941 
.000 
1950 



JUL 

.53 
2.95 
1941 
.000 
1947 



AUG 

.33 
1.60 
1941 
.000 
1934 



WATER YEARS 1934 



SEP 

.34 
1.54 
1974 
.000 
1934 

1993 



8.73 








9.97 








32.5 






1983 


.54 






1977 


1250 


Fob 


27 


1940 


.00 


Oct 


1 


1933 


.00 


Oct 


1 


1933 


2730 


Dec 


22 


1955 


6.40 


Dec 


22 


1955 


6320 








19 








.80 








.00 









a Adjusted for upstream diversions by San Jose Water Works. 



158 



ALAMEDA CREEK BASIN 
11176000 ARROYO MOCHO NEAR LIVERMORE, CA 



R.2 E., Alameda County, Hydrologlc 
^ ml upstream from small right-bank 



LOCATION. --Lat 37*37'35", long 121'42'13", in NW 1/4 SE 1/A sec. 36, T.3 S., 
Unit 180S000A, on right bank AO ft downstream from Mines Road Bridge, 2. 
tributary, and S.2 mi southeast of Livermore. 

DRAINAGE AREA. --38.2 mi^. 

PERIOD OF RECORD. — January 1912 to September 1930, October 1963 to current year. Records for water year 191<i 
incomplete; yearly estimate and monthly discharge only for some months, published in WSP 131S-B. 

GAGE. --Water-stage recorder. Datum of gage is 746.49 ft above sea level. January 1912 to October 1914, at 

present site at different datum. November 1914 to Sept. 30, 1930, at site 1 mi upstream at different datum. 

REMARKS. — Ho estimated daily discharges. Records fair. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge recorded, 2.250 ft^/s, Jan. 24. 1983, gage height, 8.80 ft, 
from rating curve extended above 600 ft /s on basis of slope-area measurement of peak flow; maximum gage 
height, 10.44 ft, Feb. 19, 1986, from floodmarks; no flow for parts of most years. 

EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of Dec. 23, 1955, reached a discharge of 1,880 ft'/s, on basis of 
slope-area measurement of peak flow. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 90 ff'/s and maximum (*): 

Discharge Gage height Discharge Gage height 

Date Time (ft^/s) (ft) Date Time (ft^/s) (ft) 



Dec. 


29 


0045 


92 


4.99 


Jan. 


1 


1630 


127 


5.25 


Jan. 


13 


0700 


*440 


*6.98 



Jan. 


17 


1530 


202 


5.71 


Feb. 


19 


2245 


220 


5.83 


Feb. 


26 


0215 


101 


5.06 



No flow for many days . 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


45 




3.8 


SO 




23 


2.7 


4.0 


.41 


13 


.10 


2 


.00 


.00 


.00 


30 




3.6 


40 




18 


2.6 


3.4 


.39 


13 


.10 


3 


.00 


.00 


.00 


13 




3.5 


33 




15 


2.6 


3.1 


.37 


13 


.09 


4 


.00 


.00 


.00 


B. 


2 


3.4 


28 




14 


2.7 


3.7 


.34 


13 


.07 


5 


.00 


.00 


.00 


6. 


2 


3.0 


23 




12 


2.5 


4.6 


.38 


13 


.07 


6 


.00 


.00 


.00 


5. 


8 


3.0 


19 




10 


2.4 


3.8 


.37 


12 


.07 


7 


.00 


.00 


.00 


39 




3.0 


16 




9.5 


2.2 


3.4 


.32 


10 


.05 


8 


.00 


.00 


.00 


45 




27 


13 




8.6 


2.2 


3.2 


.32 


10 


.05 


9 


.00 


.00 


.00 


27 




62 


11 




8.4 


2.1 


2.9 


.32 


10 


.05 


10 


.00 


.00 


.00 


22 




35 


9 


6 


7.6 


2.2 


2.5 


.32 


10 


.05 


11 


.00 


.00 


.00 


16 




22 


8 


8 


7.2 


2.2 


2.2 


.31 


10 


.05 


12 


.00 


.00 


.00 


18 




14 


8 


4 


6.6 


2.4 


2.0 


.28 


10 


.05 


13 


.00 


.00 


.00 


206 




10 


8 





6.1 


2.4 


1.8 


.26 


10 


.05 


14 


.00 


.00 


.00 


90 




8.1 


8 


1 


6.0 


2.2 


1.7 


.24 


13 


.05 


15 


.00 


.00 


.00 


43 




6.8 


7 


5 


5.6 


2.4 


1.6 


.22 


13 


.05 


16 


.00 


.00 


.00 


38 




5.9 


6 


8 


5.0 


2.4 


1.5 


.20 


13 


.05 


17 


.00 


.00 


.00 


81 




5.3 


8 


5 


5.7 


2.5 


1.3 


.20 


13 


.05 


18 


.00 


.00 


.27 


79 




22 


7 


7 


7.6 


2.7 


1.2 


.22 


13 


.06 


19 


.00 


.00 


.74 


42 




115 


6 


4 


5.6 


2.8 


1.0 


.20 


13 


.07 


20 


.00 


.00 


.61 


31 




123 


6 





4.8 


3.4 


.96 


.20 


13 


.05 


21 


.00 


.00 


.58 


41 




77 


5 


4 


4.3 


3.6 


.93 


.19 


13 


.05 


22 


.00 


.00 


.53 


51 




51 


5 





3.9 


3.7 


.91 


.17 


13 


.05 


23 


.00 


.00 


.49 


31 




45 


6 


1 


3.7 


3.7 


.86 


.17 


10 


.05 


24 


.00 


.00 


.62 


21 




47 


22 




3.8 


4.1 


.76 


.16 


09 


.05 


25 


.00 


.00 


.54 


14 




37 


20 




3.6 


6.3 


.67 


.13 


10 


.05 


26 


.00 


.00 


.50 


10 




80 


90 




3.3 


5.1 


.58 


.13 


10 


.05 


27 


.00 


.00 


.50 


8. 


1 


67 


70 




3.2 


4.5 


.51 


.13 


10 


.05 


28 


.00 


.00 


5.4 


6 


6 


67 


59 




3.1 


4.2 


.48 


.13 


10 


.05 


29 


.00 


.00 


51 


5 


5 





41 




2.8 


3.7 


.47 


.12 


10 


.05 


30 


.00 


.00 


31 


4 


6 





33 




2.9 


3.7 


.43 


.10 


10 


.06 


31 


.00 





11 


4 


1 





25 







4.2 





.11 


10 





TOTAL 


0.00 


0.00 


103.78 


1082 


1 


950.4 


695 


3 


220.9 


96.4 


56.46 


7.41 3 


53 


1.74 


MEAN 


.000 


.000 


3.35 


34 


9 


33.9 


22 


4 


7.36 


3.11 


1.88 


.24 


11 


.058 


MAX 


.00 


.00 


51 


206 


123 


90 


23 


6.3 


4.6 


.41 


13 


.10 


MIN 


.00 


.00 


.00 


4 


1 


3.0 


5 





2.8 


2.1 


.43 


.10 


09 


.05 


AC-FT 


.00 


.00 


206 


2150 


1890 


1380 


438 


191 


112 


15 


'.0 


3.5 



ALAMEDA CREEK BASIN 



159 



11176000 ARROYO MOCHO NEAR LIVERMORE, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1913 



HEAN 

MAX 

(Wf) 

MIN 

(WY) 



OCT 

.10 
1.55 
1984 
.000 
1913 



NOV 

.89 
11.6 
1984 
.000 
1915 



SU^«ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

3.70 
33.2 
1984 
.000 
1919 



JAN 

12.9 
122 
1983 
.000 
1991 



FEB 

21.3 
100 
1915 
.000 
1991 



FOR 1992 CALENDAR YEAR 

1218.21 
3.33 



287 Feb 15 
.00 Jan 1 
.00 Jun 19 



2420 
3.7 
.00 
.00 



1993, BY WATER YEAR (WY) 

MAR APR MAY Jim 



12.9 
155 
1983 
.000 
1924 



4.82 
41.8 
1982 
.000 
1924 



1.50 
21.5 
1983 
.000 
1920 



FOR 1993 WATER YEAR 



3218.02 
8.82 



206 



.00 
.00 



440 

6. 

6380 

30 



98 



Jan 13 
Oct 1 
Oct 1 
Jan 13 
Jan 13 



.61 
.00 



.53 
6.96 
1983 
.000 
1913 



JUL 

.18 
4.04 
1983 
.000 
1913 



AUG 

.087 
2.57 
1983 
.000 
1913 



WATER YEARS 1913 



SEP 

.076 
2.47 
1983 
.000 
1913 

1993 



4.91 








38.8 






1983 


.035 






1924 


1510 


Mar 


1 


1983 


.00 


Oct 


1 


1912 


.00 


Oct 


1 


1912 


2250 


Jan 


24 


1983 


10.44 


Feb 


19 


1986 


3560 








6.0 








.20 








.00 









160 



ALAMEDA CREEK BASIN 
11176400 ARROYO VALLE BELOW LANG CANYON. NEAR LIVERMORE, CA 



LOCATION. --Lat 37*33'*1". long 121'40'58", In NE l/* NE l/U sec. 30, T.« S., R.3 E., Alameda County, Hydrologic 
Unit 18050004, on left bank 100 ft upstream from small left-bank tributary, 1.2 ml downstream from Lang 
Canyon, and 9.S ml southeast of Llvermore. 



DRAINAGE AREA.--130 ml''. 

PERIOD OF RECORD. --October 1963 to current year. 
Llvermore. " 



Prior to October 197'i, published as "above Lang Canyon, near 



GAGE. --Water-stage recorder. Concrete control since June 19, 1975. Elevation of gage Is 750 ft above sea level, 
from topographic map. Prior to June 19, 1975, at site 1.4 ml upstream at different datum. 



REMARKS. --Records fair. 



No regulation or diversion upstream from station. 

.3, 



EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 8,790 ff^/s, Feb. 17, 1985, gage height, 7.36 ft, from rating 
curve extended above 1,000 ft /s on basis of slope-area measurements at gage heights 4.13, 5.40, and 7.36 ft; 
no flow at times In most years. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 500 ft^/s and maximum (*): 







Discharge 
(ft^/s) 


Gage height 






Discharge 
(ft^/s) 


Gage he 


Date 


Time 


(ft) 


Date 


Time 


(ft) 


Jan. 7 


1030 


667 


2.23 


Feb. 9 


0045 


1,060 


2.61 


Jan. 13 


1100 


*3,890 


*4.45 


Feb. 19 


0330 


2.030 


3.32 


Jan. 17 


2000 


1,460 


2.93 


Mar. 26 


2100 


621 


2.18 


Jan. 22 


0215 


723 


2.29 











No flow for many days . 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


218 


e86 


302 


130 


17 




9.7 


.28 


.00 


.00 


2 


.00 


.00 


.00 


213 


e73 


233 


115 


15 




8.5 


.20 


.00 


.00 


3 


.00 


.00 


.00 


77 


e58 


189 


105 


15 




6.9 


.16 


.00 


.00 


4 


.00 


.00 


.00 


44 


e36 


149 


99 


16 




7.1 


.08 


.00 


.00 


5 


.00 


.00 


.00 


32 


26 


121 


95 


15 




9.5 


.06 


.00 


.00 


6 


.00 


.00 


.00 


29 


21 


104 


87 


15 




8.7 


.03 


.00 


.00 


7 


.00 


.00 


.00 


414 


18 


93 


80 


15 




8.2 


.00 


.00 


.00 


8 


.00 


.00 


.00 


343 


295 


86 


76 


14 




7.6 


.00 


.00 


.00 


9 


.00 


.00 


.00 


168 


656 


76 


72 


13 




6.6 


.00 


.00 


.00 


10 


.00 


.00 


2.8 


148 


269 


68 


68 


13 




6.4 


.00 


.00 


.00 


11 


.00 


.00 


16 


115 


208 


62 


63 


13 




5.6 


.00 


.00 


.00 


12 


.00 


.00 


9.8 


99 


160 


56 


60 


13 




5.4 


.00 


.00 


.00 


13 


.00 


.00 


3.8 


2680 


111 


54 


55 


13 




4.6 


.00 


.00 


.00 


14 


.00 


.00 


1.8 


1330 


80 


52 


52 


13 




4.5 


.00 


.00 


.00 


IS 


.00 


.00 


1.2 


433 


61 


47 


48 


13 




3.8 


.00 


.00 


.00 


16 


.00 


.00 


.89 


387 


48 


41 


43 


13 




3.4 


.00 


.00 


.00 


17 


.00 


.00 


1.5 


674 


39 


46 


44 


13 




3.1 


.00 


.00 


.00 


18 


.00 


.00 


5.3 


857 


173 


43 


50 


12 




2.6 


.00 


.00 


.00 


19 


.00 


.00 


2.5 


405 


1660 


34 


43 


12 




2.4 


.00 


.00 


.00 


20 


.00 


.00 


1.6 


301 


1230 


29 


37 


11 




1.9 


.00 


.00 


.00 


21 


.00 


.00 


1.3 


366 


538 


25 


33 


10 




1.9 


.00 


.00 


.00 


22 


.00 


.00 


1.5 


583 


311 


21 


31 


10 




1.5 


.00 


.00 


.00 


23 


.00 


.00 


1.3 


371 


297 


22 


30 


9. 


9 


1.5 


.00 


.00 


.00 


24 


.00 


.00 


1.0 


284 


368 


63 


28 


9. 


8 


1.4 


.00 


.00 


.00 


25 


.00 


.00 


l.O 


244 


272 


59 


26 


13 




1.0 


.00 


.00 


.00 


26 


.00 


.00 


1.0 


212 


516 


435 


25 


12 




.79 


.00 


.00 


.00 


27 


.00 


.00 


1.0 


183 


508 


416 


23 


11 




.73 


.00 


.00 


.00 


28 


.00 


.00 


30 


160 


403 


313 


21 


10 




.52 


.00 


.00 


.00 


29 


.00 


.00 


181 


el48 





217 


19 


9. 


6 


.48 


.00 


.00 


.00 


30 


.00 


.00 


100 


ell8 





170 


17 


8. 


8 


.34 


.00 


.00 


.00 


31 


.00 





51 


el03 





142 





9. 


8 





.00 


.00 





TOTAL 


0.00 


0.00 


417.29 


11739 


8521 


3768 


1675 


387. 


9 


126.66 


0.81 


0.00 


0.00 


MEAN 


.000 


.000 


13.5 


379 


304 


122 


55.8 


12. 


5 


4.22 


.026 


.000 


.000 


MAX 


.00 


.00 


181 


2680 


1660 


435 


130 


17 


9.7 


.28 


.00 


.00 


MIN 


.00 


.00 


.00 


29 


18 


21 


17 


8. 


8 


.34 


.00 


.00 


.00 


AC-FT 


.00 


.00 


828 


23280 


16900 


7470 


3320 


769 


251 


1.6 


.00 


.00 


e Estimated. 



























ALAMEDA CREEK BASIN 



11176'.00 ARROYO VALLE BELOW LANG CANYON, NEAR LIVERMORE, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 196A 
OCT NOV DEC JAN FEB 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



.25 
3.12 
1984 
.000 
1965 



7.94 
79.2 
1983 
.000 
1977 



SUWIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



31.7 
216 
1984 
.000 
1990 



101 

492 

1983 

.000 

1991 



132 

779 

1986 

.24 

1991 



FOR 1992 CALENDAR YEAR 

6274.87 
17.1 



1220 



Feb 15 
.00 May 31 
.00 May 31 



12450 
25 



.00 
.00 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



93.5 
625 

1983 
.82 

1977 



39.9 
322 

1982 
.14 

1977 



8.41 
71.5 
1983 
.001 
1977 



FOR 1993 WATER YEAR 

26635.66 
73.0 



2680 

.00 
.00 
3890 
4.45 
52830 
212 
1.8 
.00 



Jan 13 
Oct 1 
Oct 1 
Jan 13 
Jan 13 



2.32 
17.3 
1983 
.000 
1976 



JUL 

.59 
7.43 
1983 
.000 
1964 



AUG 

.19 
3.67 
1983 
.000 
1964 



161 



SEP 

.12 
2.00 
1983 
.000 
1964 



WATER YEARS 1964 - 1993 



34.3 








174 






1983 


.24 






1977 


4860 


Feb 


19 


1986 


.00 


Oct 


1 


1963 


.00 


Oct 


1 


1963 


8790 


Feb 


17 


1986 


7.36 


Feb 


17 


1986 


24870 








49 








1.2 








.00 









162 



ALAMEDA CREEK BASIN 
11176500 ARROYO VALLE NEAR LIVERMORE, CA 



LOCATION. --Lat 37'37'2«", long lai'^a'aS", in Valle de San Jose Grant. Alameda County, Hydrologic Unit 1805000*, 
on right bank 900 ft downstream from highway bridge, 1.1 mi upstream from Dry Creek, 1.3 mi downstream froo 
Del Valle Dam, 4 . 1 mi south of Livermore, and 6.9 mi southeast of Pleasanton. 

DRAINAGE AREA.--147 mi^. 

PERIOD OF RECORD. --January 1912 to September 1930, October 1957 to current year. Monthly discharge only for same 
periods, published in WSP 1315-B. Published as Arroyo del Valle near Livermore, 1912-29. 

GAGE. — Water-stage recorder and concrete control. Datum of gage is 510.44 ft above sea level. Prior to November 
1914, at site 900 ft upstream at different datum. Nov. 1, 1914. to Sept. 30. 1930, at site 300 ft upstream at 
different datum. 

REMARKS. --Records fair. Flow regulated by Del Valle Reservoir 1.3 mi upstream beginning in September 1968, 

capacity, 77,100 acre-ft. Water from Sacramento-San Joaquin Delta imported through South Bay Aqueduct can be 
pumped into Del Valle Reservoir for storage and later released into the channel for downstream percolation or 
returned to the South Bay Ac[ueduct.' 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 12,200 ft^/s, Apr. 2, 1958, gage height. 10.91 ft; no flow at 
times. Maximum discharge since construction of Del Valle Dam in 1968. 2.850 ft /s. Mar. 3, 1983, gage height, 
8.89 ft. 

EXTREMES OOTSIDE PERIOD OF RECORD. --Flood of Dec. 23, 1955, reached a stage of 13.9 ft from floodmarks, 
discharge, 18,200 ft /s, on basis of contracted-opening and slope-area measurement of peak flow. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 1,460 ft'/s, Feb. 20, gage height, 7.10 ft; minimum daily, 
0.07 ft^/s, June 19. 23. 



DISCHARGE. 



CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.S3 


.80 


.64 


5.0 


1.4 


297 


57 


.69 


.76 


36 


32 




.13 


2 


.S7 


.81 


.84 


2.9 


1.4 


174 


55 


.76 


.69 


36 


32 




.16 


3 


.S7 


.59 


1.3 


2.3 


1.4 


72 


55 


.95 


.67 


37 


32 




2.2 


4 


.54 


.41 


1.2 


2.0 


1.4 


33 


55 


1.5 


.66 


38 


32 




9.4 


S 


.SO 


.41 


1.2 


1.4 


1.4 


2.5 


31 


1.5 


.70 


37 


32 




9.6 


6 


.SI 


.43 


2.1 


.76 


1.4 


1.8 


1.6 


2.1 


.62 


36 


32 




9.6 


7 


.41 


.42 


3.0 


2.5 


1.8 


1.5 


1.4 


1.9 


.53 


34 


31 




13 


8 


.38 


.43 


2.5 


1.2 


3.7 


1.4 


1.2 


.73 


.47 


32 


30 




27 


9 


.38 


.42 


3.8 


.79 


3.0 


1.2 


1.2 


.76 


.31 


32 


30 




34 


10 


.43 


.42 


4.2 


.78 


2.0 


1.1 


1.1 


.75 


.25 


32 


30 




34 


11 


.43 


.39 


4.2 


.73 


2.1 


1.1 


.91 


.88 


.26 


32 


30 




29 


12 


.40 


.36 


3.3 


.81 


17 


1.0 


.91 


.88 


.25 


32 


35 




21 


13 


.47 


.40 


3.0 


5.6 


70 


.88 


.97 


.89 


.22 


32 


30 




21 


14 


.49 


.40 


3.2 


1.8 


69 


.89 


.99 


.90 


.27 


31 


30 




21 


IS 


.S3 


.40 


3.0 


1.1 


70 


.88 


.81 


.88 


.26 


31 


30 




21 


16 


.49 


.38 


2.9 


.95 


69 


.96 


.86 


.91 


.10 


31 


29 




21 


17 


.32 


.43 


3.6 


165 


69 


1.5 


.97 


.90 


.10 


31 


32 




21 


18 


.S5 


.45 


3.2 


702 


70 


1.3 


.93 


.98 


.08 


31 


35 




21 


19 


.56 


.55 


3.2 


759 


427 


.76 


.80 


1.0 


.07 


31 


35 




21 


20 


.55 


.64 


3.2 


235 


1180 


.74 


.74 


1.2 


.08 


31 


18 




15 


21 


.67 


.71 


3.4 


7.7 


1180 


.72 


.78 


1.2 


.08 


31 




31 


.42 


22 


.59 


.74 


3.0 


6.5 


705 


.64 


.78 


1.1 


.08 


30 




18 


9.8 


23 


.57 


.74 


3.0 


3.7 


449 


.81 


.81 


1.1 


.07 


30 




14 


20 


24 


.53 


.74 


2.9 


3.4 


248 


1.2 


.72 


1.0 


4.1 


30 




14 


20 


2S 


.49 


.70 


2.9 


2.9 


248 


.69 


.73 


.99 


20 


30 




11 


20 


26 


.50 


.74 


2.9 


2.2 


281 


204 


.74 


.96 


36 


31 




10 


20 


27 


.52 


.70 


3.1 


1.9 


296 


376 


.74 


.88 


36 


33 




11 


20 


26 


.60 


.69 


4.5 


1.8 


296 


373 


.65 


.87 


39 


33 




09 


20 


29 


.79 


.69 


4.7 


1.7 





226 


.55 


.97 


46 


33 




09 


20 


30 


.88 


.61 


3.9 


1.6 





66 


.62 


1.0 


42 


32 




22 


20 


31 


.82 





2.8 


1.6 





63 





1.0 





32 




18 





TOTAL 


16.77 


16.60 


90.68 


1926.62 


5765.0 


1907.57 


275.51 


32.13 


230.68 


1008 


618. 


67 


521.31 


MEAN 


.54 


.55 


2.93 


62.1 


206 


61.5 


9.18 


1.04 


7.69 


32.5 


2C 


1.0 


17.4 


MAX 


.88 


.81 


4.7 


759 


1180 


376 


57 


2.1 


46 


38 




35 


34 


MIN 


.38 


.36 


.64 


.73 


1.4 


.64 


.55 


.69 


.07 


30 




09 


.13 


AC-FT 


33 


33 


180 


3820 


11430 


3780 


546 


64 


458 


2000 


1230 


1030 



ALAMEDA CREEK BASIN 



163 



11176500 ARROYO VALLE NEAR LIVERMORE, CA- -Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1912 - 1968, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.016 


2.63 


18.0 


87.6 


146 


51.4 


47.2 


7.37 


1.83 


.32 


.089 


.021 


MAX 


.15 


69.2 


125 


851 


522 


280 


620 


57.8 


9.47 


2.28 


.83 


.24 


(WY) 


1967 


1927 


1965 


1914 


1915 


1958 


1958 


1915 


1967 


1967 


1958 


1958 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.094 


.000 


.000 


.000 


.000 


(WY) 


1914 


1914 


1918 


1918 


1920 


1924 


1924 


1924 


1918 


1914 


1913 


1913 



SUWIARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1912 - 1968 



29.6 








118 






1914 


.008 






1924 


5930 


Jan 


25 


1914 


.00 


Sep 


22 


1912 


.00 


Sep 


22 


1912 


12200 


Apr 


2 


1958 


10.91 


Apr 


2 


1958 


21460 








35 








.20 








.00 









STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 1993, BY WATER YEAR CWY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


9.10 


8.36 


8.89 


32.6 


85.4 


61.6 


23.2 


6.61 


9.93 


15.7 


14.1 


11.0 


MAX 


43.2 


39.4 


35.9 


440 


549 


653 


334 


30.8 


51.7 


46.0 


54.3 


48.1 


(WY) 


1971 


1981 


1981 


1983 


1986 


1983 


1982 


1970 


1980 


1980 


1981 


1981 


MIN 


.17 


.30 


.36 


.35 


.30 


.36 


.22 


.23 


.15 


.079 


.11 


.16 


(WY) 


1987 


1987 


1989 


1990 


1991 


1977 


1990 


1990 


1990 


1985 


1989 


1984 



SUtWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1970 - 1993 



319.78 






12409.54 










.87 






34.0 






23.5 
131 
.44 


1983 
1987 


4.7 


Dec 


29 


1180 


Feb 


20 


2370 


Mar 3 1983 


.24 


Jun 


3 


.07 


Jun 


19 


.00 


Jun 25 1983 


.28 


May 


17 


.08 


Jun 


17 


.05 


Jun 24 1983 








1460 


Feb 


20 


2850 


Mar 3 1983 








7.10 


Feb 


20 


8.89 


Mar 3 1983 


634 






24610 






17050 




1.9 






38 






35 




.55 






1.4 






1.8 




.30 






.40 






.24 





let, 



ALAMEDA CREEK BASIN 
11177000 ARROYO DE LA LAGUNA NEAR PLEASANTON. CA 



LOCATION. --Lat 37'36'55", long 121'52'50", in Valle de San Jose Grant. Alameda County, Hydrologlc Unit 16050004, 
on right bank 0.3 ml upstream from small left bank tributary, 0.8 ml downstream from highway bridge, and 
3.2 mi south of Pleasanton. 

DRAINAGE AREA.— 405 mi^. 

PERIOD OF RECORD. — January 1912 to September 1930, October 1969 to September 1983, October 1987 to current year. 
Monthly discharge only for some periods, published in WSP 131S-B. 

GAGE. --Water- stage recorder and crest-stage gage. Datum of gage is 2A8.40 ft above sea level. January 1912 to 
September 1917, at site 3.0 mi upstream at different datum. October 1917 to September 1930, at site 0.8 mi 
downstream at different datum. October 1969 to September 1983, at datum 3.00 ft higher. 

RQ1ARKS.--NO estimated daily discharges. Records fair. Flow partly regulated by Del Valle Reservoir 15 mi 

upstream, beginning in September 1968, capacity, 77,100 acre-ft. Water imported from Sacramento-San Joaquin 
Delta (see REMARKS for station 11176500). 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 11,400 ft^/s, Jan. 5, 1982, gage height, 22.61 ft, present 
datum; no flow at times. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 6,100 ft^/s, Jan. 13, gage height, 17.81 ft; minimum daily, 
1.6 ft^/s, Nov. 29. 



DAY 



OCT 



DISCHARGE . 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


4.6 


6.8 


3.5 


599 


27 


392 


131 


13 


20 


26 


35 


11 


2 


4.6 


4.1 


39 


185 


25 


330 


82 


13 


14 


23 


32 


13 


3 


4.4 


3.3 


82 


71 


23 


151 


68 


21 


12 


33 


26 


9.9 


4 


4.7 


2.7 


19 


47 


20 


111 


66 


19 


27 


36 


28 


6.3 


5 


4.8 


2.2 


6.5 


39 


21 


82 


62 


15 


37 


33 


27 


4.0 


6 


4.7 


2.4 


210 


120 


23 


61 


49 


13 


22 


28 


27 


6.1 


7 


4.S 


2.2 


141 


712 


33 


52 


31 


14 


17 


28 


29 


7.3 


8 


4.4 


1.9 


40 


350 


264 


47 


24 


13 


12 


26 


29 


4.6 


9 


4.2 


1.9 


547 


123 


331 


40 


29 


12 


10 


23 


28 


3.2 


10 


4.7 


1.8 


182 


82 


82 


36 


20 


13 


7.9 


27 


27 


3.0 


11 


4.5 


1.9 


203 


56 


92 


33 


18 


12 


7.6 


30 


26 


18 


12 


4.5 


1.9 


82 


237 


48 


32 


16 


12 


8.2 


27 


28 


26 


13 


4.3 


1.9 


40 


3450 


35 


31 


17 


18 


8.3 


25 


30 


21 


14 


4.4 


2.0 


31 


851 


65 


36 


21 


13 


9.5 


24 


33 


17 


15 


4.0 


2.2 


27 


300 


74 


31 


22 


12 


6.9 


20 


36 


18 


16 


3.1 


2.2 


23 


281 


72 


28 


21 


14 


6.6 


21 


34 


16 


17 


2.4 


2.2 


69 


472 


96 


146 


79 


14 


5.6 


19 


25 


18 


IB 


2.5 


2.4 


56 


758 


135 


54 


68 


13 


4.8 


19 


24 


21 


19 


3.2 


2.1 


32 


873 


281 


33 


33 


15 


4.3 


17 


25 


23 


20 


3.9 


5.2 


25 


1130 


1430 


28 


24 


15 


4.0 


17 


32 


24 


21 


16 


3.6 


22 


849 


1880 


27 


20 


14 


5.9 


18 


34 


17 


22 


6.6 


2.7 


20 


808 


958 


24 


19 


19 


5.9 


24 


32 


11 


23 


4.4 


3.0 


19 


176 


1050 


98 


19 


20 


5.0 


26 


26 


6.7 


24 


3.5 


2.2 


18 


106 


486 


180 


31 


31 


4.8 


20 


31 


8.2 


2S 


4.3 


2.7 


17 


78 


357 


58 


22 


48 


5.0 


20 


31 


16 


26 


4.1 


2.1 


16 


61 


1380 


531 


21 


25 


4.5 


19 


20 


21 


27 


3.2 


2.2 


18 


50 


529 


623 


22 


17 


4.6 


23 


26 


21 


28 


2.7 


2.3 


364 


42 


446 


555 


21 


12 


14 


27 


18 


15 


29 


106 


1.6 


418 


36 





359 


17 


9.8 


24 


31 


15 


15 


30 


61 


1.9 


221 


32 





140 


13 


8.6 


31 


30 


15 


14 


31 


18 





60 


29 





105 





40 





32 


12 





TOTAL 


312.2 


77.6 


3051.0 


13003 


10263 


4454 


1086 


528.4 


349.4 


772 


841 


415.3 


MEAN 


10.1 


2.59 


98.4 


419 


367 


144 


36.2 


17.0 


11.6 


24.9 


27.1 


13.8 


MAX 


106 


6.8 


547 


3450 


1880 


623 


131 


48 


37 


36 


36 


26 


MIN 


2.4 


1.6 


3.5 


29 


20 


24 


13 


8.6 


4.0 


17 


12 


3.0 


AC-FT 


619 


154 


6050 


25790 


20360 


8830 


2150 


1050 


693 


1530 


1670 


824 



ALAMEDA CREEK BASIN 



165 



11177000 ARROYO DE LA LAGUNA NEAR PLEASANTON, CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1912 - 1930, BY WATER YEAR (WY) 

OCT MOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


1.43 


1.96 


IS. 9 


174 


234 


59.5 


18.5 


8.67 


3.52 


2.06 


1.36 


1.19 


MAX 


9.90 


13.4 


lOS 


13A9 


728 


207 


59.8 


74.0 


13.9 


13.1 


8.76 


6.98 


(W5f) 


1917 


1927 


1914 


191« 


1915 


1919 


1926 


1915 


1916 


1916 


1916 


1916 


MIN 


.000 


.000 


.000 


.000 


.84 


.53 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1914 


1914 


1919 


1925 


1924 


1924 


1929 


1924 


1918 


1913 


1913 


1913 



SU»1ARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1912 - 1930 



42.5 








180 






1914 


.69 






1913 


9810 


Jan 


25 


1914 


.00 


Jun 


30 


1913 


.00 


Jun 


30 


1913 


30800 








33 








.90 








.00 









STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 
OCT NOV DEC JAN FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


19.6 


30.4 


51.1 


159 


188 


166 


67.9 


21.8 


16.8 


18.7 


17.6 


15.2 


MAX 


42.3 


92.3 


156 


867 


925 


1510 


517 


116 


43.0 


40.6 


43.5 


41.1 


(Wlf) 


1971 


1983 


1983 


1983 


1983 


1983 


1982 


1983 


1983 


1975 


1981 


1981 


MIN 


3.34 


2.59 


6.46 


6.07 


12.7 


9.39 


6.49 


4.05 


2.88 


1.80 


2.31 


2.28 


(WY) 


1991 


1993 


1990 


1991 


1977 


1988 


1990 


1992 


1991 


1992 


1991 


1991 



SU^»^ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1970 - 1993 



9944.44 






35152.9 










27.2 






96.3 




63.7 
339 
11.6 




1983 
1977 


952 


Feb 


15 


3450 


Jan 13 


5270 


Jan 


5 1982 


.84 


Jul 


6 


1.6 


Nov 29 


.33 


Jul 


11 1990 


1.1 


Jul 


6 


1.9 


Nov 8 


1.1 


Jul 


6 1992 








6100 


Jan 13 


11400 


Jan 


5 1982 








17.81 


Jan 13 


22.61 


Jan 


5 1982 


19720 






69730 




46150 






50 






214 




71 






4.2 






23 




17 






2.1 






3.6 




3.9 







166 



ALAMEDA CREEK BASIN 
11179000 ALAMEDA CREEK NEAR NILES, CA 



LOCATION. --Lat 37*35'14", long 121'57'35", in NW 1/4 sec. 15, T.4 S., R. 1 M. , Alameda County, Hydrologie Unit 
18050004, on right bank 0.3 mi downstream from railroad bridge, 1.2 mi northeast of Niles, and 8.3 mi 
downstream from James B. Turner Dam on San Antonio Creek. 

DRAINAGE AREA. --633 mi^. 



WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. --January 1891 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. Published as "at Niles Dam" 1891-1900 and as "at Sunolglen" 1901-21. 

REVISED RECORDS. --WSP 1315-B: 1921. WSP 1515: 1951-52, 1956. WSP 1565: 1945. WDR CA-86-2: 1984(M). 

GAGE. — Water-Stage recorder and concrete control. Datum of gage is 85.65 ft above sea level. Prior to 1901, 
nonrecording gage at site 1 mi upstream at different datum. From 1901 to Sept. 30, 1914, nonrecording gage; 
Oct. 1, 1914, to Sept. 30, 1916, water-stage recorder at site 4.5 mi upstream at different datum; 
Oct. 1, 1916, to Dec. 17, 1923, water-stage recorder at site 800 ft upstream at different datum. 

REMARKS. --No estimated daily discharges. Records good. Flow regulated since 1916 by Calaveras Reservoir, 
although dam not completed until 1925, usable capacity, 96,800 acre-ft, most of which is diverted for San 
Francisco water supply; since February 1965 by Seui Antonio Reservoir, capacity, 51,000 acro-ft; and since 
September 1968 by Del Valle Reservoir, 23 mi upstream, capacity, 77,100 acre-ft. Natural flow of stream 
affected by water imported from Delta-Mendota Canal beginning in 1962. Other diversions from ground-water 
basin for irrigation of 9,000 acres upstream from station. 



EXTREMES FOR PERIOD OF RECORD. 

(water years 1892-1962), no flow 

EXTREMES FOR CURRENT YEAR .- -Maximum discharge, 
5.1 ft^/s, Sept. 11. 



Maximum discharge, 29,000 ft^/s, Dec. 23, 1955, gage height, 14.9 ft; minimvmi 
:iow at times; minimum daily (water years 1963-93), 0.63 ft /s, Oct. 7-10, 198' 



1984. 



10,100 ff'/s, Jan. 13, gage height, 11.25 ft; minimum daily. 



DAY 



OCT 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR CKTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


32 


26 


33 


677 


64 


637 


419 


61 


40 


31 


33 


13 


2 


34 


28 


41 


220 


58 


541 


292 


57 


30 


32 


31 


12 


3 


36 


27 


109 


69 


57 


305 


242 


59 


25 


41 


24 


11 


4 


36 


26 


36 


42 


57 


232 


210 


62 


27 


39 


25 


10 


S 


36 


25 


17 


33 


54 


185 


183 


56 


58 


39 


25 


8.6 


6 


35 


24 


175 


70 


45 


153 


158 


52 


38 


36 


26 


7.5 


7 


34 


24 


204 


806 


46 


135 


128 


76 


34 


29 


30 


7.2 


8 


33 


24 


54 


529 


266 


125 


112 


54 


30 


24 


32 


7.1 


9 


32 


24 


S63 


156 


497 


108 


110 


45 


24 


21 


33 


6.2 


10 


33 


30 


141 


91 


136 


110 


99 


39 


19 


25 


28 


5.2 


11 


34 


44 


223 


61 


129 


123 


88 


37 


17 


35 


27 


5.1 


12 


34 


44 


78 


120 


88 


116 


83 


35 


18 


34 


27 


26 


13 


34 


44 


33 


4660 


65 


113 


82 


41 


19 


30 


29 


25 


14 


33 


44 


24 


1580 


84 


107 


80 


37 


21 


28 


31 


20 


IS 


33 


44 


20 


504 


99 


102 


79 


36 


22 


23 


37 


17 


16 


33 


44 


16 


553 


98 


97 


84 


36 


15 


21 


37 


17 


17 


35 


44 


38 


650 


124 


195 


140 


33 


12 


25 


27 


16 


18 


36 


33 


49 


1110 


209 


109 


151 


29 


11 


27 


25 


19 


19 


36 


33 


24 


1160 


1600 


108 


115 


29 


13 


25 


25 


24 


20 


37 


20 


17 


1190 


3020 


143 


102 


31 


32 


24 


32 


27 


21 


46 


8.0 


14 


1270 


2210 


132 


91 


32 


43 


20 


35 


22 


22 


43 


6.2 


14 


1450 


1350 


117 


84 


30 


31 


22 


39 


17 


23 


39 


26 


14 


343 


1510 


144 


83 


36 


17 


29 


33 


13 


24 


37 


33 


12 


199 


1040 


339 


92 


32 


12 


27 


32 


10 


25 


37 


34 


11 


153 


633 


224 


78 


74 


11 


28 


31 


10 


26 


37 


33 


11 


138 


1940 


913 


70 


53 


14 


27 


26 


15 


27 


37 


33 


11 


113 


992 


1400 


68 


40 


14 


29 


26 


21 


28 


28 


34 


320 


95 


774 


1350 


60 


35 


17 


29 


26 


20 


29 


85 


33 


464 


83 





985 


58 


32 


27 


28 


20 


17 


30 


86 


33 


295 


73 





575 


63 


30 


30 


28 


17 


15 


31 


34 





71 


67 





414 





49 





29 


14 





TOTAL 


1195 


925.2 


3132 


18265 


17445 


10337 


3704 


1348 


721 


885 


883 


443.9 


MEAN 


38.5 


30.8 


101 


589 


623 


333 


123 


43.5 


24.0 


28.5 


28.5 


14.8 


MAX 


86 


44 


563 


4660 


3020 


1400 


419 


76 


58 


41 


39 


27 


MIN 


28 


6.2 


11 


33 


45 


97 


58 


29 


11 


20 


14 


5.1 


AC-FT 


2370 


1840 


6210 


36230 


34600 


20500 


7350 


2670 


1430 


1760 


1750 


880 



ALAMEDA CREEK BASIN 



167 



11179000 ALAMEDA CREEK NEAR HILES, CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1925 - 1961. BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR HAY JUN 



JUL 



AUG 



SEP 



MEAN 


2.61 


21.0 


101 


185 


322 


213 


156 


18.9 


8.19 


5.46 


3.26 


3.14 


MAX 


36.5 


581 


1469 


2578 


2431 


1439 


2323 


95.5 


46.1 


50.1 


47.5 


48.9 


(Mf) 


1936 


1951 


1956 


1952 


1938 


1938 


1958 


1941 


1938 


1935 


1935 


1935 


MIN 


.000 


.000 


.000 


.22 


.71 


.17 


1.08 


.11 


.000 


.000 


.000 


.000 


(WY) 


1925 


1926 


1931 


1949 


1948 


1931 


1929 


1934 


1931 


1929 


1925 


1925 



SUhMARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1925 - 1961 



85.4 








401 






1952 


.90 






1961 


23900 


Dec 


23 


1955 


.00 


Oct 


1 


1924 


.00 


Oct 


1 


1924 


29000 


Dec 


23 


1955 


14.9 


Dec 


23 


1955 


61830 








91 








2.7 








.00 









STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


28.2 


56.0 


101 


223 


367 


319 


142 


55.4 


46.7 


42.6 


41.6 


33.3 


MAX 


78.6 


247 


434 


1335 


1928 


2725 


1163 


318 


154 


62.9 


65.9 


62.1 


(Wf) 


1992 


1984 


1984 


1983 


1983 


1983 


1982 


1983 


1973 


1981 


1972 


1981 


MIN 


9.91 


23.1 


20.1 


28.4 


28.9 


32.5 


18.3 


18.6 


16.3 


20.6 


16.8 


2.51 


(WY) 


1979 


1970 


1979 


1985 


1977 


1977 


1991 


1971 


1978 


1974 


1974 


1984 



SUWIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1970 - 1993 



21248. 


8 






59284.1 








58. 


1 






162 




120 
621 
31.5 


1983 
1977 


1620 




Feb 


15 


4660 


Jan 13 


9360 


Feb 19 1986 


1. 


4 


Jul 


11 


5.1 


Sep 11 


.63 


Oct 7 1984 


5. 


6 


Jul 


7 


6.7 


Sep 5 


.66 


Oct 4 1984 










10100 


Jan 13 


16400 


Feb 19 1986 










11.25 


Jan 13 


14.77 


Feb 19 1986 


42150 








117600 




86930 




65 








341 




155 




41 








36 




42 




17 








17 




16 





168 ALAMEDA CRSEK BASIN 

11179000 ALAMEDA CREEK NEAR NILES, CA--Coiltinuad 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1906. 1952-73, 1975 to September 1993 (discontinued). 
CHEMICAL DATA: Water years 1906, 1952-67, 1969, 1975-79. 

SPECIFIC CONDUCTANCE: Water years 1956-57, 1959-62, 1976 to September 1993 (discontinued). 
WATER TEMPERATURE: Water years 1956-73, 1976-78. 
SEDIMENT DATA: Water years 1957-73. 

PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: July 1956 to July 1957, August 1959 to September 1962, October 1975 to September 1993 

(discontinued) . 
WATER TEMPERATURE: July 1956 to September 1973, October 1975 to September 1978. 

INSTRUMENTATION. — Water-quality monitor since October 1975. Digital recorder set for 1-hour-interval punches. 

REMARKS. — Interruptions in record were due to malfunction of recording Instruments. Specific conductance 
affected by regulation of imported water. 

EXTREMES FOR PERIOD OF DAILY RECORD.— 

SPECIFIC CONDUCTANCE: Maximum recorded, 1,530 microsiemens , Nov. 19, 1977; minimum recorded, 122 microsiemens, 
Jan. 22, 1983. 

EXTREMES FOR CURRENT YEAR.— 

SPECIFIC CONDUCTANCE: Maximum recorded, 1.510 microsiemens, Dec. 28; minimum recorded. 162 microsiemens. 
Feb. 8. 9. 

SPECIFIC CONDUCTANCE, US/CM g 25 DEGREES CELSIUS, WATER YEAR CCTOBER 1992 TO SEPTEMBER 1993 



DAY 



1 
2 

3 

4 
5 

6 
7 
8 
9 
10 

11 
12 
13 
14 
IS 

16 
17 
18 
19 
20 

21 
22 
23 
24 
25 

26 
27 

28 
29 
30 

31 



MAX MIN 

(XIOBER 



MAX 



MIN 



MAX 



MIN 



662 


656 


673 


661 


674 


666 


691 


671 


743 


690 


931 


743 


978 


731 


731 


716 


716 


690 


705 


677 


709 


705 


708 


696 


696 


682 


936 


424 


608 


424 


618 


564 



NOVEMBER 


799 


618 


752 


724 


738 


730 


754 


720 


758 


744 


760 


752 


779 


760 


778 


755 


776 


765 


794 


776 


792 


734 


748 


736 


802 


737 


810 


802 


815 


808 


814 


808 


812 


807 


834 


812 


845 


834 


842 


837 


892 


842 


1090 


880 


1370 


930 


873 


835 


840 


832 


845 


825 


826 


816 


845 


621 


842 


815 


818 


812 



DECEMBER 



868 


814 


869 


808 


8AA 


485 


601 


536 


609 


588 


987 


356 


511 


356 


595 


506 


818 


324 



465 


458 


470 


464 


478 


469 


488 


477 


49S 


485 


1450 


487 


1440 


753 


753 


551 


551 


529 


530 


523 


536 


521 


544 


529 


552 


534 


557 


538 


561 


541 


563 


550 


1510 


313 


383 


274 


371 


274 


277 


271 



MAX 


MIN 


JANUARY 


706 


212 


297 


274 


297 


278 


283 


280 


284 


281 


1240 


281 


884 


268 


381 


376 


385 


379 


379 


354 


1110 


350 


812 


230 


533 


309 


725 


533 


582 


453 


825 


440 


720 


441 


751 


676 


723 


273 


557 


287 


541 


294 



MAX MIN 
FEBRUARY 



MAX 



MIN 



MARCH 



368 


358 


368 


358 


456 


162 


246 


162 


273 


244 


314 


272 


276 


271 


278 


275 


311 


278 


315 


304 


313 


305 


353 


307 


330 


182 



MONTH 



1370 



618 



ALAMEDA CREEK BASIN 169 

11179000 ALAMEDA CREEK NEAR NILES, CA--Contlnued 
SPECIFIC CONDUCTANCE, US/CM @ 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN 
APRIL MAY JUNE JULY AUGUST SEPTEMBER 

2 

3 

♦ 

5 

6 
7 

8 
9 

10 

11 
12 
13 
1* 
15 

16 

17 
18 
19 
20 

21 
22 
23 
24 
25 

26 
27 

28 
29 
30 

31 

MONTH — — — — — — 978 698 814 621 851 640 















978 


948 


792 


765 


728 


702 








860 


782 


959 


929 


813 


792 


734 


713 








795 


775 


934 


890 


814 


767 


742 


724 








909 


795 


903 


869 


785 


716 


748 


733 














873 


853 


760 


730 


749 


723 


— 











856 


842 


760 


672 


744 


717 








865 


817 


849 


833 


732 


690 


743 


729 








850 


800 


844 


817 


748 


723 


790 


743 








800 


748 


837 


785 


748 


720 


821 


788 








910 


786 


804 


774 


739 


694 


841 


815 


— 





883 


752 


780 


721 


712 


667 


851 


824 








957 


805 


806 


764 


693 


670 


831 


811 








827 


765 


818 


777 


700 


678 


840 


822 


884 


831 


856 


789 


817 


764 


702 


685 


848 


825 


862 


828 


891 


833 


782 


753 


702 


681 


842 


827 


828 


795 


873 


831 


774 


751 


700 


675 


828 


786 


832 


811 


938 


852 


774 


746 


699 


680 


786 


751 


845 


828 


961 


937 


770 


698 


701 


679 


751 


706 


840 


808 








749 


709 


701 


678 


720 


700 


843 


792 


952 


897 


821 


742 


697 


674 


716 


698 


792 


781 


925 


876 


826 


789 


696 


669 


722 


702 


807 


787 


909 


856 


815 


751 


702 


686 


722 


702 


951 


807 


938 


898 


782 


762 


712 


695 


722 


697 


910 


857 


898 


857 


780 


767 


718 


684 


723 


699 








940 


869 


781 


750 


710 


689 


717 


686 


906 


807 








774 


741 


713 


671 


691 


672 


807 


771 


994 


957 


795 


773 


728 


674 


674 


644 


802 


769 


957 


879 


801 


784 


681 


621 


659 


640 


797 


767 








801 


759 


677 


650 


661 


642 


769 


739 


996 


947 


780 


705 


680 


652 


662 


646 














765 


719 


712 


680 









170 



ALAMEDA CREEK BASIN 
11180500 DRY CREEK AT UNION CITY, CA 



LOCATION. --Lat 37'36'22", long 122"01*22", in Arroyo de la Alameda Grant, Alameda County, Hydrologic Unit 

18050004. on right bank 900 ft downstream from bridge on State Highway 238 in Decoto District in Union City 
and 1.7 mi upstream from mouth. 

DRAINAGE AREA. --9. 39 mi^. 

PERIOD OF RECORD. --October 1916 to September 1919 (published as "near Decoto"), April 1959 to current year. 

REVISED RECORDS. --WSP 2129: 1962{M), 1963(P), 1965(P). WDR CA-76-2: Drainage area. 

GAGE. --Water-stage recorder and concrete control. Elevation of gage is 85.12 ft above sea level, froo 
topographic map. Prior to Apr. 1, 1959, at site 1.4 mi downstream at different datum. 

RB4ARKS.--NO estimated daily discharges. Records good. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 1,330 ft^/s, Jan. 26, 1983, gage height, 5.14 ft, from rating 
curve extended above 600 ft /s on basis of slope-area measurement of peak flow; maximum gage height, 5.27 ft, 
Oct. 13, 1962, from high-water marks past gage; no flow for many days each year. 

EXTRQ1ES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 90 ft^/s and maximum (*): 



Data 



Discharge Gage height 
Time (ft^/s) (ft) 



Date 



Time 



Discharge Gage height 
(ft^/s) (ft) 



Jan. 


13 


0615 


*537 


*3.79 


Jan. 


20 


1915 


305 


3.24 



Feb. 


19 


2115 


141 


2.75 


Feb. 


26 


0500 


367 


3.40 



No flow for many days . 



DISCHARGE, CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


27 




2.5 


14 


5.8 


.75 


.16 


.00 


.00 


.00 


2 


.00 


.00 


.04 


8. 


8 


2.3 


11 


3.8 


.70 


.08 


.00 


.00 


.00 


3 


.00 


.00 


.00 


4. 


2 


2.2 


8.9 


3.3 


.78 


.05 


.00 


.00 


.00 


4 


.00 


.00 


.00 


2. 


8 


2.1 


7.2 


3.2 


.77 


.30 


.00 


.00 


.00 


S 


.00 


.00 


.00 


2. 


2 


2.0 


6.1 


2.8 


.66 


.50 


.00 


.00 


.00 


6 


.00 


.00 


.16 


4. 





2.2 


5.6 


2.5 


.62 


.20 


.00 


.00 


.00 


7 


.00 


.00 


.02 


39 




3.0 


5.0 


2.4 


.84 


.14 


.00 


.00 


.00 


8 


.00 


.00 


.00 


29 




4.9 


4.7 


2.2 


1.5 


.08 


.00 


.00 


.00 


8 


.00 


.00 


.20 


16 




5.4 


4.2 


2.4 


.57 


.04 


.00 


.00 


.00 


10 


.00 


.00 


.06 


11 




2.6 


4.1 


2.1 


.48 


.01 


.00 


.00 


.00 


11 


.00 


.00 


.67 


6. 


3 


3.9 


3.9 


2.0 


.37 


.00 


.00 


.00 


.00 


12 


.00 


.00 


.24 


21 




2.6 


3.4 


1.8 


.35 


.00 


.00 


.00 


.00 


13 


.00 


.00 


.00 


230 




2.2 


3.3 


1.6 


.32 


.00 


.00 


.00 


.00 


14 


.00 


.00 


.00 


97 




2.0 


3.2 


1.5 


.26 


.00 


.00 


.00 


.00 


IS 


.00 


.00 


.00 


29 




1.8 


2.9 


1.5 


.27 


.00 


.00 


.00 


.00 


16 


.00 


.00 


.00 


22 




1.7 


2.8 


1.4 


.25 


.00 


.00 


.00 


.00 


17 


.00 


.00 


.00 


26 




2.2 


5.2 


2.7 


.21 


.00 


.00 


.00 


.00 


18 


.00 


.00 


.00 


28 




7.7 


4.3 


3.2 


.17 


.00 


.00 


.00 


.00 


19 


.00 


.00 


.00 


17 




78 


3.3 


1.9 


.14 


.00 


.00 


.00 


.00 


20 


.00 


.00 


.00 


44 




56 


2.8 


1.5 


.17 


.00 


.00 


.00 


.00 


21 


.00 


.00 


.00 


52 




28 


2.6 


1.3 


.17 


.00 


.00 


.00 


.00 


22 


.00 


.00 


.00 


38 




20 


2.4 


1.2 


.15 


.00 


.00 


.00 


.00 


23 


.00 


.00 


.00 


18 




27 


3.8 


1.4 


.12 


.00 


.00 


.00 


.00 


24 


.00 


.00 


.00 


13 




18 


6.4 


2.0 


.34 


.00 


.00 


.00 


.00 


25 


.00 


.00 


.00 


9. 


3 


14 


3.6 


1.4 


.50 


.00 


.00 


.00 


.00 


26 


.00 


.00 


.00 


6. 


8 


101 


6.2 


1.1 


.31 


.00 


.00 


.00 


.00 


27 


.00 


.00 


.00 


5. 


,5 


28 


5.7 


.98 


.40 


.00 


.00 


.00 


.00 


28 


.00 


.00 


.28 


4, 


.6 


10 


5.8 


.81 


.26 


.00 


.00 


.00 


.00 


28 


.15 


.00 


.96 


4, 








4.5 


.84 


.15 


.00 


.00 


.00 


.00 


30 


.00 


.00 


1.3 


3. 


.2 





3.9 


.78 


.12 


.00 


.00 


.00 


.00 


31 


.00 





.55 


2. 


9 





3.8 





.28 





.00 


.00 





TOTAL 


0.15 


0.00 


4.48 


823. 


7 


443.3 


154.8 


61.52 


13.08 


1.57 


0.00 


0.00 


0.00 


MEAN 


.005 


.000 


.14 


26. 


,6 


15.8 


4.99 


2.05 


.42 


.052 


.000 


.000 


.000 


MAX 


.15 


.00 


1.3 


230 


101 


14 


5.8 


1.5 


.50 


.00 


.00 


.00 


MIN 


.00 


.00 


.00 


2, 


,2 


1.7 


2.4 


.79 


.12 


.00 


.00 


.00 


.00 


AC-FT 


.3 


.00 


8.9 


1630 


879 


307 


122 


26 


3.1 


.00 


.00 


.00 



ALAMEDA CREEK BASIN 



171 



11180500 DRY CREEK AT UNION CITY. CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1917 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



HEAM 


.18 


.65 


2.37 


6.95 


8.31 


6.10 


2.87 


.55 


.16 


.030 


.014 


.004 


MAX 


6.31 


11.3 


21.0 


31.7 


36.8 


58.2 


20.1 


6.45 


2.87 


.82 


.51 


.10 


(WY) 


1963 


1984 


1971, 


1973 


1983 


1983 


1982 


1983 


1983 


1983 


1983 


1983 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1917 


1917 


1918 


1918 


1918 


1972 


1917 


1917 


1917 


1917 


1917 


1917 



SUWIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1917 - 1993 



317.26 




.87 




47 


Feb 15 


.00 


Jan 1 


.00 


Jan 7 


629 




1.3 




.00 




.00 





1502.60 






4.12 






230 


Jan 


13 


.00 


Oct 


1 


.00 


Oct 


1 


537 


Jan 


13 


3.79 


Jan 


13 


2980 






6.6 






.00 






.00 







2.33 








13.0 






1983 


.002 






1977 


335 


Jan 


21 


1970 


.00 


Oct 


1 


1916 


.00 


Oct 


1 


1916 


1330 


Jan 


26 


1983 


5.27 


Oct 


13 


1962 


1690 








3.9 








.00 








.00 









172 



ALAMEDA CREEK BASIN 



11180700 PATTERSON CREEK AT UNION CITY, CA 



LOCATION. --Lat 37"55'09", long 122*02'50", in Potrero de los Cerritos Grant, Alameda County, Bydrologic Unit 
1805000'!, on right bank 0.1 mi downstream from effluence from Alameda Creek, 0.2 mi upstream from bridge on 
Interstate 680 (Nimitz Freeway), and 2.0 mi southwest of Decoto District In Union City. 

PERIOD OF RECORD. --October 1958 to current year. 

GAGE. --Water-stage recorder. Datum of gage is ^.13 ft above sea level. Prior to Oct. 26, 1966, at site 0.2 ml 
downstream at same datum. 

RIMARKS. --No estimated daily discharges. Records poor. This stream is a distributary of Alameda Creek. 

Diversion by Alameda County Water District to percolation ponds between station 11179000 and this station; 
additional percolation to ground water by placing check dams in channel. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 22,100 ft^/s, Feb. 19, 1986, gage height, 18. «* ft; no flow at 
times in each year. 



EXTREMES FOR CURRENT YEAR. --Maximum discharge, 10,500 ft' 
days. 



7s, Jan. 13. gage height, 15.20 ft; no flow for many 



DISCHARGE , 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.SO 


.00 


6A3 




2.9 


378 


408 


4.9 


1.7 


.00 


.00 


.00 


2 


.00 


.23 


.09 


66 




3.4 


323 


296 


6.1 


1.6 


.00 


.00 


.00 


3 


.00 


.13 


3.9 


4. 


1 


3.3 


184 


246 


5.7 


.64 


.00 


.00 


.00 


4 


.00 


.08 


.92 


1. 


9 


2.9 


122 


115 


9.5 


.50 


.00 


.00 


.00 


S 


.00 


.07 


.31 


1. 


2 


3.6 


100 


51 


8.2 


.75 


.00 


.00 


.00 


6 


.00 


.05 


10 


3. 





2.0 


77 


27 


6.3 


.64 


.00 


.00 


.00 


7 


.00 


.03 


9.6 


494 




2.3 


63 


9.9 


4.6 


.64 


.00 


.00 


.00 


8 


.00 


.02 


2.1 


450 




66 


59 


8.3 


3.4 


.46 


.00 


.00 


.00 


8 


.00 


.00 


333 


42 




296 


83 


7.9 


1.1 


.29 


.00 


.00 


.00 


10 


.00 


.00 


51 


2. 


2 


52 


82 


7.8 


.94 


.18 


.00 


.00 


.00 


11 


.00 


.00 


19 




68 


4.1 


77 


7.4 


.83 


.13 


.00 


.00 


.00 


12 


.00 


.00 


5.8 


12 




2.8 


72 


6.9 


.86 


.05 


.00 


.00 


.00 


13 


.00 


.00 


1.9 


4800 




2.4 


77 


6.5 


.87 


.02 


.00 


.00 


.00 


14 


.00 


.00 


.88 


1330 




2.3 


76 


6.4 


.35 


.00 


.00 


.00 


.00 


IS 


.00 


.00 


.55 


285 




2.3 


74 


10 


.21 


.00 


.00 


.00 


.00 


16 


.00 


.00 


.39 


429 




6.0 


87 


35 


.16 


.00 


.00 


.00 


.00 


17 


.00 


.00 


.49 


380 




136 


185 


87 


.13 


.00 


.00 


.00 


.00 


18 


.00 


.00 


1.5 


748 




107 


92 


117 


.11 


.00 


.00 


.00 


.00 


19 


.00 


.00 


.67 


656 




1180 


30 


44 


.11 


.00 


.00 


.00 


.00 


20 


.00 


.00 


.'i5 


657 




2280 


84 


23 


.11 


.03 


.00 


.00 


.00 


21 


.00 


.00 


.37 


1070 




1470 


80 


13 


.10 


.16 


.00 


.00 


.00 


22 


.00 


.00 


.32 


992 




828 


67 


6.1 


.11 


.00 


.00 


.00 


.00 


23 


.00 


.00 


.32 


47 




950 


196 


7.0 


.07 


.00 


.00 


.00 


.00 


24 


.00 


.00 


.32 


21 




604 


403 


17 


.10 


.00 


.00 


.00 


.00 


2S 


.00 


.00 


.32 


10 




316 


242 


19 


.35 


.03 


.00 


.00 


.00 


26 


.00 


.00 


.32 


47 




1510 


673 


11 


.32 


.14 


.00 


.00 


.00 


27 


.00 


.00 


.35 


41 




656 


1090 


17 


.69 


.02 


.00 


.00 


.00 


28 


.00 


.00 


160 


125 




394 


1090 


8.5 


1.0 


.00 


.00 


.00 


.00 


29 


«.« 


.00 


269 


30 







813 


4.9 


1.0 


.00 


.00 


.00 


.00 


30 


12 


.00 


'i5'i 


3. 


5 





573 


4.2 


2.3 


.00 


.00 


.00 


.00 


31 


2.5 





9.5 


3. 








408 





2.4 





.00 


.00 





TOTAL 


18.90 


1.11 


1337.37 


13394. 


58 


10885.3 


7960 


1627.8 


62.92 


7.98 


0.00 


0.00 


0.00 


MEAN 


.61 


.037 


43.1 


432 


389 


257 


54,3 


2.03 


.27 


.000 


.000 


.000 


MAX 


12 


.50 


i5i 


4800 


2280 


1090 


408 


9.5 


1.7 


.00 


.00 


.00 


MIN 


.00 


.00 


.00 




68 


2.0 


30 


4.2 


.07 


.00 


.00 


.00 


.00 


AC-FT 


37 


2.2 


2650 


26570 


21590 


15790 


3230 


125 


16 


.00 


.00 


.00 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1959 - 1993, BY WATER YEAR (WY) 



MEAN 


7.08 


34.0 


75.3 


193 


299 


244 


116 


21.4 


7.10 


1.01 


.45 


1.30 


MAX 


53.0 


404 


557 


1711 


2150 


3007 


1091 


312 


120 


9.14 


8.73 


19.1 


(WY) 


1963 


1984 


1984 


1983 


1983 


1983 


1982 


1983 


1973 


1973 


1970 


1983 


MIN 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


.000 


(WY) 


1959 


1959 


1959 


1959 


1961 


1960 


1959 


1959 


1959 


1959 


1959 


1959 



SUM1ARY STATISTICS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1959 - 1993 



ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



5707.60 






35295.96 










15.6 






96.7 






82.2 
703 

.000 


1983 
1961 


1500 


Feb 


15 


4800 


Jan 


13 


11700 


Feb 19 1986 


.00 


May 


18 


.00 


Oct 


1 


.00 


Oct 1 1958 


.00 


May 


18 


.00 


Oct 


1 


.00 


Oct 1 1958 








10500 


Jan 


13 


22100 


Feb 19 1986 








15.20 


Jan 


13 


18.44 


Feb 19 1986 


11320 






70010 






59530 




4.4 






289 






117 




.09 






.29 






.00 




.00 






.00 






.00 





SAN LORENZO CREEK BASIN 
11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA 



173 



LOCATION. --Lat 37'41'42", long 122'02'38", in San Lorenzo Grant, Alameda County, Hydrologic Unit 180S0004, on 
left bank, 2S0 ft south of Interstate Highway 580, 0.4 mi southeast of Independent School, and 2.2 mi east of 
Castro Valley. 

DRAINAGE AREA.— 18.0 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. — October 1980 to current year. 

GAGE. — Water-stage recorder. Elevation of gage is 260 ft above sea level, from topographic map. 

REMARKS. — No estimated daily discharges. Records good. Some regulation of low flow by ponds upstream from 
station. 

EXTREMES FOR PERIOD OF RECORD. — Maximum discharge, 1,590 ft^/s, Jan. 13, 1993, gage height, 8.73 ft; maximum gage 
height, 9.50 ft, Jan. 24, 1983; no flow for many days in some years. 

q 
EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 275 ft /s and maximum (*): 



Date 


Time 


Discharge 
(ft^/s) 


Gage height 
(ft) 


Date 


Time 


Discharge 
(ft^/s) 


Gage he: 
(ft) 


Dec. 9 
Jan. 13 
Jan. 20 


0430 
0615 
1830 


301 

*1,590 

844 


3.51 

*8.73 

6.12 


Feb. 18 
Feb. 26 


2315 
0500 


327 
463 


3.66 
4.40 



No flow Oct. 10. 



DISCHARGE, 



DAY 



OCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



HAY 



JUN 



JUL 



AUG 



SEP 



1 


.02 


.21 


.28 


74 




14 


39 


12 


2.8 


3.7 


1.1 


.08 


.10 


2 


.02 


.04 


5.4 


IS 




13 


31 


7.6 


2.6 


3.6 


1.1 


.05 


.09 


3 


.02 


.04 


1.4 


7. 


9 


12 


27 


7.0 


3.3 


4.0 


1.2 


.05 


.07 


4 


.01 


.05 


.12 


6. 


1 


11 


23 


7.9 


2.9 


6.1 


1.1 


.08 


.09 


S 


.01 


.05 


.05 


5. 


1 


11 


21 


6.7 


2.7 


4.3 


.97 


.16 


.11 


6 


.01 


.05 


18 


15 




9.5 


19 


6.3 


2.6 


3.7 


1.0 


.19 


.24 


7 


.01 


.04 


4.6 


96 




13 


17 


6.0 


2.6 


3.7 


.98 


.32 


.18 


8 


.01 


.05 


3.2 


51 




18 


16 


6.5 


2.6 


3.7 


.97 


.30 


.13 


9 


.01 


.05 


42 


26 




17 


15 


6.4 


2.6 


3.8 


.92 


.20 


.09 


10 


.00 


.05 


15 


16 




10 


14 


5.5 


2.5 


3.9 


.81 


.17 


.09 


11 


.01 


.05 


5.9 


11 




14 


13 


5.1 


2.6 


4.1 


.71 


.19 


.07 


12 


.01 


.05 


1.6 


57 




9.6 


11 


4.8 


2.6 


4.0 


.62 


.31 


.12 


13 


.01 


.05 


1.1 


669 




8.8 


10 


4.5 


2.4 


4.1 


.62 


.27 


.11 


14 


.01 


.39 


.93 


209 




8.4 


9.7 


4.4 


2.6 


4.1 


.54 


.29 


.10 


15 


.01 


.32 


.87 


108 




7.7 


8.4 


4.6 


2.7 


4.1 


.54 


.28 


.09 


16 


.01 


.39 


.79 


70 




7.4 


10 


4.1 


2.8 


4.3 


.54 


.36 


.10 


17 


.01 


.07 


3.2 


94 




10 


25 


9.2 


2.9 


4.1 


.43 


.21 


.09 


18 


.01 


.07 


.82 


80 




SO 


16 


6.0 


3.2 


2.7 


.34 


.15 


.14 


19 


.02 


.36 


.71 


55 




186 


8.9 


4.5 


3.3 


2.5 


.34 


.20 


.14 


20 


.63 


.09 


.66 


172 




164 


7.9 


4.0 


3.7 


2.5 


.43 


.29 


.13 


21 


1.3 


.07 


.62 


178 




92 


7.4 


3.7 


3.9 


2.4 


.34 


.27 


.12 


22 


.03 


.17 


.62 


133 




62 


6.8 


3.5 


3.7 


2.2 


.27 


.15 


.12 


23 


.06 


.13 


.62 


80 




84 


13 


6.3 


3.8 


2.1 


.27 


.14 


.11 


24 


.03 


.13 


.82 


56 




56 


13 


4.8 


7.5 


1.8 


.22 


.10 


.08 


23 


.03 


.13 


.71 


43 




47 


9.6 


3,5 


3.9 


1.6 


.17 


.10 


.09 


26 


.03 


.13 


.79 


33 




151 


17 


3.3 


3.5 


1.4 


.15 


.09 


.08 


27 


.03 


.13 


.81 


26 




69 


15 


3.2 


3.9 


1.4 


.17 


.06 


.09 


28 


.05 


.14 


26 


22 




52 


12 


3.0 


3.2 


1.4 


.17 


.06 


.08 


29 


8.5 


.12 


9.5 


19 







9.2 


2.9 


2.9 


1.3 


.22 


.07 


.11 


30 


.59 


.12 


5.7 


16 







8.4 


2.9 


3.2 


1.2 


.17 


.07 


.14 


31 


.16 





2.9 


15 







11 





4.3 





.12 


.08 





TOTAL 


11.66 


3.74 


155.72 


2458. 


1 


1207.4 


464.3 


160.2 


99.8 


93.8 


17.53 


5.34 


3.30 


MEAN 


.38 


.12 


5.02 


79. 


3 


43.1 


15.0 


5.34 


3.22 


3.13 


.57 


.17 


.11 


MAX 


8.5 


.39 


42 


669 


186 


39 


12 


7.5 


6.1 


1.2 


.36 


.24 


MIN 


.00 


.04 


.05 


5. 


1 


7.4 


6.8 


2.9 


2.4 


1.2 


.12 


.05 


.07 


AC-FT 


23 


7.4 


309 


4880 


2390 


921 


318 


198 


186 


35 


11 


6.5 



!?♦ SAN LORENZO CREEK BASIN 

11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA--Contlnued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1981 - 1993, BY WATER YEAR (WY) 



OCT 



HOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



HEAR 


.96 


3.56 


7.11 


15.8 


22.7 


18.6 


7.25 


2.62 


1.18 


.44 


.19 


.20 


MAX 


2.20 


16.6 


30.1 


79.3 


81.5 


90.7 


42.3 


13.0 


3.89 


2.05 


.69 


.53 


(WY) 


1992 


1984 


1984 


1993 


1986 


1983 


1982 


1983 


1983 


1983 


1983 


1986 


MIN 


.072 


.12 


.65 


.16 


.65 


.47 


.70 


.19 


.13 


.023 


,001 


.000 


(HY) 


1989 


1993 


1990 


1991 


1989 


1990 


1990 


1991 


1990 


1989 


1988 


1988 



SUW1ARY STATISTICS 

ANNUAL TOTAL 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



1183.24 
3.23 



121 Feb 15 
.00 Oct 10 
.01 Oct 4 



FOR 1993 WATER YEAR 



WATER YEARS 1981 - 1993 



2350 
6.7 
.27 
.02 



4680.89 






12.8 






669 


Jjin 


13 


.00 


Oct 


10 


.01 


Oct 


4 


1590 


Jan 


13 


8.73 


Jan 


13 


9280 






25 






2.5 






.05 







6.64 








22.8 






1983 


.70 






1989 


669 


Jan 


13 


1993 


.00 


Aug 


28 


1981 


.00 


Sep 


6 


1981 


1590 


Jan 


13 


1993 


9.50 


Jan 


24 


1983 


4810 








13 








.65 








.03 









SAN LORENZO CREEK BASIN 

111B082S SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. — December 1980 to current year (storm season only). 
WATER TEMPERATURE: December 1980 to current year. 
SEDIMENT DATA: December 1980 to current year. 

PERIOD OF DAILY RECORD.— 

WATER TEMPERATURE: December 1980 to current year. 
SUSPENDED-SEDIMENT DISCHARGE: December 1980 to current year. 



175 



REMARKS. --Sediment samples were collected on most days 
observed for flows less than IS ft /s. 



where water temperature is published. Zero-bedload discharge 



EXTREMES FOR PERIOD OF RECORD. -- 

SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 10,000 mg/L, Jan. 4, 1982; minimuni daily mean, 

mg/L, Feb. 26, 1989. 
SEDIMENT LOAD (storm season only): Maximum daily, 19,800 tons, Jan. 4, 1982; minimum daily, ton several days in 
most years. 
EXTREMES FOR CURRENT YEAR.-- 

SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 4,190 mg/L, Jan. 13; minimum daily mean, 3 mg/L, 

Nov. 17, 18. 
SEDIMENT LOAD (storm season only): Maximum dally, 9,110 tons, Jan. 13; ton for many days. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DIS- 






SEDI- 


SED. 


SED. 


SED. 






CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 






INST. 




SEDI- 


DIS- 


FALL 


FALL 


FALL 






CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 






FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


Z FINER 


Z FINER 


DATE TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 






SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.002 »1 


.004 ^m 


.008 m 


OCT 


















21.. 


0845 


0.34 


16.0 


23 


0.02 


— 


— 


— 


29.. 


1100 


42 


15.0 


629 


71 


— 


— 


— 


29.. 


1305 


36 


15.0 


426 


41 


— 


— 


— 


DEC 


















02.. 


1535 


14 


8.5 


424 


16 


— 


— 


— 


02.. 


1655 


17 


8.5 


630 


29 


— 


— 


— 


09.. 


1030 


22 


12.5 


1700 


101 


78 


92 


94 


10.. 


1435 


46 


12.5 


2360 


293 


34 


44 


61 


11.. 


1330 


15 


11.0 


406 


16 


-- 


-- 


-- 


17.. 


1510 


7.0 


10.0 


129 


2.4 


— 


— 


— 


28.. 


1930 


13 


9.5 


585 


21 


-- 


— 


— 


JAN 


















01.. 


1620 


57 


9.0 


434 


67 


-- 


— 


— 


07.. 


1010 


41 


9.0 


322 


36 


-- 


-- 


-- 


13.. 


1450 


636 


12.0 


6040 


10400 


21 


27 


31 


19.. 


1115 


56 


10.0 


134 


20 


— 


— 


— 


FEB 


















02.. 


1240 


12 


10.0 


74 


2.4 - 


— 


— 


— 


MAR 


















11. . 


1215 


13 


14.0 


118 


4.1 


-- 


-- 


-- 


15.. 


1505 


8.4 


14.5 


80 


1.8 


-- 


-- 


— 


17.. 


1005 


27 


14.5 


2540 


185 


53 


63 


78 


27.. 


1425 


26 


12.5 


400 


28 


— 


— 


— 


APR 


















17.. 


1700 


12 


14.0 


297 


9.6 


-- 


— 


— 


23.. 


2045 


21 


14.0 


156 


8.8 


-- 


— 


— 



176 



SAN LORENZO CREEK BASIN 



11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA--Continued 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



OCT 

21.. 

29.. 

29. . 
DEC 

02.. 

02.. 

09.. 

10. . 

11. . 
17.. 
28. . 

JAN 

01.. 

07.. 

13. . 

19. . 
FEB 

02.. 
MAR 

11. . 

15.. 

17.. 

27.. 
APR 

17.. 

23.. 



SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


FALL 


FALL 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 



.016 ^« .031 »1 .062 htl .125 m . 250 m .500 hH 1.00 hW 



98 
79 



99 

91 



40 



52 



93 



99 



91 
96 
96 

98 

100 
100 
96 
100 
100 
100 

99 
99 
66 
94 

79 

72 
68 

100 
99 

98 
99 



99 
99 



100 
99 



100 

100 

85 



100 
100 



100 



96 



99 



100 



100 



100 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 



BED BED 

MAT. MAT. 

SIEVE SIEVE 

DIAM. DIAM. 

Z FINER Z FINER Z FINER 

THAN THAN 

(COUNT) SECOND (DEG C) .062 m .125 tti .250 HI 





DIS- 




BED 


NUMBER 


CHARGE, 




MAT. 


OF 


INST. 




SIEVE 


SAM- 


CUBIC 


TEMPER- 


DIAM. 


PLING 


FEET 


ATURE 


Z FINE! 


POINTS 


PER 


WATER 


THAN 



MAR 



DATE 



MAR 



1230 




13 


14.0 


36 


66 


77 


1235 




13 


14.0 


19 


59 


91 


1240 




13 


14.0 


26 


69 


93 


1245 




13 


14.0 


2 


4 


9 


1250 




13 


14.0 


17 


32 


46 


1255 




13 


14.0 


6 


24 


75 


1300 




13 


14.0 


13 


39 


74 


BED 


BED 


BED 


BED 


BED 


BED 


BED 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


.500 rti 


1.00 ^W 


2. 00 Ml 


4.00 n^ 


8.00 h*l 


16.0 ^^l 


32.0 m 


83 


91 


98 


100 


-- 


-- 


__ 


98 


99 


100 


-- 


— 


— 


— 


96 


99 


100 


-- 


-- 


-- 


-- 


16 


21 


30 


44 


58 


71 


100 


58 


70 


87 


93 


95 


95 


100 


98 


100 


-- 


-- 


-- 


-- 


-- 


95 


99 


100 


— 


-- 


-- 


— 



SAN LORENZO CREEK BASIN 177 

11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR. NEAR CASTRO VALLEY, CA— Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



















TIME 


HORI- 










BAG 


TETHER 






ON BED 


ZONTAL 










MESH 


LINE 


START- 


END- 


FOR 


WIDTH 






SAM- 




SIZE 


USED IN 


ING 


ING 


BED 


OF 






PLING 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


DATE 


TIME 


METHOD, 


TYPE 


SAMPLER 


(YES=1) 


(2400 


(2400 


SAMPLE 


TICAL 






CODES 


(CODE) 


(Ml) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 


JAN 




















07... 


1045 


1000 


1120 


0.250 





1035 


1050 


30 


0.7 


07... 


1115 


1000 


1120 


0.250 





1105 


1120 


30 


0.7 



COMPSTD 


VER- 




SAMPLE 


DIS- 




SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE, 




IN 


IN 


OF 


ATION, 


INST. 




X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 



DISCH, SEDI- 

BEDLOAD MENT 

AV UNIT DIS- 

FOR COM CHARGE, 

POSITE BEDLOAD 

DATE MEASMNT SAMPLE POINTS (FT FM PER WATER SAMPLE (TONS/ 

(NUM) (NUM) (COUNT) L BANK) SECOND (DEG C) T/D/FT DAY) 

JAN 

07... 2 27 27 0.30 38 9.0 0.07 1.3 

07... 2 27 27 0.30 36 9.0 0.07 1.3 

SED. SED. SED. SED. BED. SED. SED. SED. 

BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD 



SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 



Z FINER Z FINER Z FINER Z FINER Z FINER Z FINER Z FINER Z FINER 
DATE THAN THAN THAN THAN THAN THAN THAN THAN 
.125 m .250 1*1 .500 MM 1.00 MM 2.00 MM 4.00 m 8.00 VK 16.0 ItA 

JAN 

07... 1 5 30 53 78 89 95 100 
07... — 4 48 82 94 98 100 

WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY INSTANTANEOUS VALUES 

MAR APR MAY JUN JUL AUG SEP 

13.0 
13.5 



lAY 


OCT 


NOV 


DEC 


JAN 


FEB 


1 


17.0 





9.5 


9,0 





2 





14.5 


10.0 





10.0 


3 








10.5 


5.0 





4 





13.0 











5 


14.0 








5.0 





6 





13.0 


10.5 


6.5 





7 
8 
9 


14.5 





10.5 

8.5 

12.5 


9.0 





16.0 


11.0 


8.5 


— 


10 








13.0 


8.0 





11 





13.0 


11.0 








12 


16.0 








7.5 





13 





13.0 


8.5 


12.0 





14 


14.5 


10.0 





10.5 





15 








7.5 


11.5 





16 


14.0 








11.0 


— 


17 





14.0 


10.0 


9.5 


— 


18 


14.5 














19 





11.0 





10.0 





20 


15.0 





6.0 


11.5 





21 


16.0 








12.5 





22 
23 

24 


15.5 


10.0 


7.0 


11.5 





14.5 


8.0 


6.0 








25 











10.5 





26 


14.5 


10.5 





10.5 





27 








5.0 








2B 


14.5 


10.0 


9.5 


10.0 





29 


15.0 





8.5 








30 


15.0 














31 








9.0 


9.0 






13.5 
15.0 



14.0 13.5 
12.0 



12.5 



14.5 



14.0 


13.0 


14.5 


14.0 


13.5 









15.0 


14.0 


13.0 





14.0 


14.5 





13.0 


14.5 


12.5 








15.0 


15.0 


16.0 


14.0 






178 



SAN LORENZO CREEK BASIN 



11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY. CA--Continued 
SEDIMENT DISCHARGE, SUSPENDED ( TONS/ DAY ) , WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





MEAN 




DISCHARGE 


lAY 


(CFS) 


1 


.02 


2 


.02 


3 


.02 


4 


.01 


S 


.01 


6 


.01 


7 


.01 


8 


.01 


9 


.01 


10 


.00 


11 


.01 


12 


.01 


13 


.01 


1* 


.01 


15 


.01 


16 


.01 


17 


.01 


18 


.01 


19 


.02 


20 


.63 


21 


1.3 


22 


.03 


23 


.06 


24 


.03 


25 


.03 


26 


.03 


27 


.03 


28 


.05 


29 


8.5 


30 


.59 


31 


.16 



MEAN 

CONCEN- SEDIMENT 

TRATION DISCHARGE 

(MG/L) (TONS/DAY) 



OCTOBER 

17 
15 
14 
13 
13 

17 
22 
17 
13 
18 

28 
44 
41 
33 
26 

20 
16 
14 
10 
21 

36 
6 
20 
12 
19 

28 
28 
31 
171 
29 
22 



11 



.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.92 

.45 
.00 
.01 
.00 
.00 

.00 
.00 

.00 

.12 
.05 



MEAN 

DISCHARGE 

(CFS) 



MEAN 

CONCEN- SEDIMENT 

TRATION DISCHARGE 

(MG/L) (TONS/DAY) 



.21 
.04 
.04 
.OS 
.OS 

.05 
.04 
.OS 
.05 
.OS 

.05 
.05 
.05 
.39 
.32 

.39 
.07 
.07 
.36 
.09 

.07 
.17 
.13 
.13 
.13 

.13 
.13 
.14 
.12 
.12 



NOVEMBER 

102 
29 
18 
13 
19 

26 
23 
19 
16 

20 

26 
24 
21 
34 
12 

4 

3 

3 

26 

8 

6 

11 

8 

9 

11 

13 
13 
13 
13 
14 



.09 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.08 
.01 

.00 

.00 
.00 
.06 
.00 

.00 
.01 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 



MEAN 
MEAN CONCEN- SEDIMENT 
DISCHARGE TRATION DISCHARGE 
(CFS) (MG/L) (TONS/DAY) 

DECEMBER 



.28 
5.4 

1.4 
.12 
.05 

18 

4.6 
3.2 
42 

15 

5.9 
1.6 
1.1 
.93 
.87 

.79 
3.2 
.82 
.71 
.66 

.62 
.62 
.62 
.82 
.71 

.79 
.81 

26 

9.5 
5.7 
2.9 



14 


.01 


154 


4.3 


100 


.83 


14 


.00 


9 


.00 


658 


135 


65 


1.5 


57 


2.7 


1730 


609 


370 


41 


260 


4.7 


138 


.63 


43 


.12 


21 


.05 


14 


.03 


9 


.02 


65 


.93 


16 


.04 


12 


.02 


9 


.02 


9 


.02 


9 


.02 


8 


.01 


16 


.05 


10 


.02 


10 


.02 


9 


.02 


758 


121 


364 


11 


72 


1.5 



13 



.11 



TOTAL 



11.66 



12.55 



3.74 



0.25 



155.72 



934.67 



SAN LORENZO CREEK BASIN 
11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA— Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



179 



MEAN 
MEAN CONCEN- SEDIMENT 
DISCHARGE TRATION DISCHARGE 
DAY (CFS) (MG/L) (TONS/DAY) 



MEAN 
MEAN CONCEN- SEDIMENT 
DISCHARGE TRATION DISCHARGE 
(CFS) (MG/L) (TONS/DAY) 



MEAN 
MEAN CONCEN- SEDIMENT 
DISCHARGE TRATION DISCHARGE 
(CFS) (MG/L) (TONS/DAY) 







JANUARY 






FEBRUARY 






MARCH 




1 


74 


564 


178 


14 


76 


2.8 


39 


195 


20 


2 


15 


126 


5.7 


13 


74 


2.5 


31 


185 


IB 


3 


7.9 


27 


.61 


12 


72 


2.4 


27 


176 


13 


4 


6.1 


13 


.22 


11 


71 


2.2 


23 


167 


10 


S 


5.1 


8 


.11 


11 


79 


2.4 


21 


158 


8.9 


6 


15 


171 


15 


9.5 


55 


1.4 


19 


ISO 


7.5 


7 


96 


587 


180 


13 


53 


1.9 


17 


142 


6.5 


8 


51 


112 


17 


18 


94 


6.3 


16 


135 


5.8 


9 


26 


114 


7.7 


17 


79 


4.6 


15 


128 


5.0 


10 


16 


68 


3.0 


10 


17 


.48 


14 


123 


4.5 


11 


11 


31 


.93 


14 


31 


1.2 


13 


117 


4.1 


12 


57 


250 


157 


9.6 


20 


.53 


11 


107 


3.3 


13 


669 


4190 


9110 


8.8 


15 


.36 


10 


98 


2.8 


14 


209 


1430 


894 


8.4 


12 


.26 


9.7 


89 


2.3 


IS 


108 


496 


150 


7.7 


9 


.20 


8.4 


80 


1.8 


16 


70 


200 


39 


7.4 


9 


.18 


10 


160 


8.7 


17 


94 


496 


151 


10 


25 


.72 


25 


1740 


223 


18 


80 


276 


62 


SO 


281 


141 


16 


676 


34 


19 


55 


135 


20 


186 


843 


476 


8.9 


185 


4.5 


20 


172 


938 


1240 


164 


671 


330 


7.9 


159 


3.4 


21 


178 


1030 


562 


92 


288 


73 


7.4 


141 


2.8 


22 


133 


702 


285 


62 


197 


33 


6.8 


124 


2.3 


23 


80 


263 


58 


B4 


405 


115 


13 


191 


8.5 


24 


56 


143 


22 


56 


254 


39 


13 


247 


9.6 


2S 


43 


77 


9.0 


47 


146 


19 


9.6 


171 


5.6 


26 


33 


42 


3.8 


151 


980 


627 


17 


287 


14 


27 


26 


37 


2.6 


69 


339 


64 


15 


266 


13 


28 


22 


38 


2.2 


52 


255 


36 


12 


177 


5.6 


29 


19 


47 


2.4 











9.2 


144 


3.6 


30 


16 


61 


2.7 











8.4 


116 


2.6 


31 


15 


75 


3.1 











11 


163 


6.9 


•OTAL 


2458.1 





13184.07 


1207.4 





1983.43 


464.3 





459.6 



180 SAN LORENZO CREEK BASIN 

11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY. CA--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY). HATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







MEAN 






MEAN 


CONCEN- 


SEDIMENT 




DISCHARGE 


TRATION 


DISCHARGE 


)AY 


(CFS) 


(MG/L) 
APRIL 


(TONS /DAY) 


1 


12 


173 


5.7 


2 


7.6 


103 


2.1 


3 


7.0 


89 


1.7 


4 


7.9 


93 


2.1 


5 


6.7 


83 


1.5 


6 


6.3 


86 


1.5 


7 


6.0 


86 


1.4 


8 


6.5 


83 


1.5 


9 


6.4 


54 


.94 


10 


5.5 


46 


.69 


11 


5.1 


40 


.55 


12 


4.8 


31 


.40 


13 


4.5 


33 


.41 


lA 


4.4 


34 


.41 


15 


4.6 


48 


.60 


16 


4.1 


52 


.57 


17 


9.2 


179 


5.7 


18 


6.0 


90 


1.5 


19 


4.5 


42 


.52 


20 


4.0 


29 


.31 


21 


3.7 


24 


.24 


22 


3.5 


22 


.21 


23 


6.3 


50 


1.6 


2* 


4.8 


67 


.91 


25 


3.5 


45 


.43 


26 


3.3 


36 


.33 


27 


3.2 


31 


.26 


28 


3.0 


25 


.21 


29 


2.9 


21 


.17 


30 


2.9 


18 


.14 


31 












TOTAL 



160.2 



34.60 



PERIOD 4461.12 



16609.17 



SU^«ARY OF WATER AND SEDIMENT DISCHARGE, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







WATER 


SUSPENDED 


BEDLOAD 


TOTAL 


MONTH 




DISCHARGE 


SEDIMENT 
DISCHARGE 


DISCHARGE 


SEDIMENT 
DISCHARGE 






CFS-DAYS 


TONS 


TONS 


TONS 


OCTOBER 


1992 


11.66 


12.55 





13 


NOVEMBER 




3.74 


0.25 








DECEMBER 




155.72 


934.67 


9 


944 


JANUARY 


1993 


2458.10 


13184.07 


312 


13500 


FEBRUARY 




1207.40 


1983.43 


128 


2110 


MARCH . . . 




464.30 


459.60 


2 


462 


APRIL ... 




160.20 


34.60 





35 


PERIOD . . 




4461.12 


16509.17 


451 


17064 



SAN LORENZO CREEK BASIN 
11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA 



181 



LOCATION. --Lat 37*42'55", long 122*03'12", in San Lorenzo (Castro) Grant, Alameda County, Hydrologlc Unit 

18050004, on left bank 0. 9 mi upstream from Cull Creek Dam and 1 . 1 mi northeast of Castro Valley Post Office. 

DRAINAGE AREA. --5. 79 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. — October 1978 to current year. 

REVISED RECORDS. --WDR CA-80-2: 1979(P). 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage is *50 ft above sea level, from topographic 
map. 

REMARKS. --Records poor. No storage or diversions upstream from station. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 1,690 ft^/s, Jan. 5, 1982, gage height, 8.71 ft; no flow for 
many days each year. 

EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 150 ft^/s and maximum (*): 



Discharge Gage height 
Time (ft^/s) (ft) 



Date 

Jan. 13 0600 *953 
No flow for many days . 



•6.14 



Date 
Jan. 20 



Time 
1745 



Discharge Gage height 
(ft^/s) (ft) 



772 



5.56 



DAY 



CCT 



DISCHARGE, 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.00 


.00 


13 




5.3 


10 


10 


.98 


2 


.00 


.00 


.02 


7. 


6 


4.6 


8.6 


7.1 


.98 


3 


.00 


.00 


.02 


4. 


6 


4.2 


7.9 


6.2 


1.1 


4 


.00 


.00 


.00 


3. 


8 


3.3 


7.0 


5.8 


1.1 


5 


.00 


.00 


.00 


3. 


3 


2.4 


7.1 


5.4 


.98 


6 


.00 


.00 


.13 


5. 


9 


2.4 


6.6 


5.0 


.98 


7 


.00 


.00 


.05 


e53 




2.5 


6.0 


4.0 


.93 


8 


.00 


.00 


.04 


22 




3.3 


5.4 


3.2 


.72 


9 


.00 


.00 


12 


17 




4.7 


5.1 


2.7 


.71 


10 


.00 


.00 


3.4 


15 




3.0 


4.9 


2.4 


.71 


11 


.00 


.00 


3.8 


15 




3.1 


4.9 


2.4 


.71 


12 


.00 


.00 


1.8 


27 




2.5 


4.7 


2.2 


.71 


13 


.00 


.00 


1.0 


315 




2.4 


4.1 


2.0 


.71 


14 


.00 


.00 


.69 


56 




2.2 


4.1 


1.9 


.70 


IS 


.00 


.00 


.58 


21 




2.2 


4.2 


1.8 


.59 


16 


.00 


.00 


.49 


17 




1.9 


4.8 


1.8 


.59 


17 


.00 


.00 


1.3 


22 




2.0 


13 


2.4 


.59 


18 


.00 


.00 


.81 


18 




7.4 


11 


2.0 


.59 


19 


.00 


.00 


.59 


12 




29 


5.7 


1.7 


.59 


20 


.00 


.00 


.49 


113 




24 


4.9 


1.7 


.59 


21 


.00 


.00 


.49 


73 




19 


6.9 


1.7 


.59 


22 


.00 


.00 


.49 


39 




14 


5.6 


1.1 


.51 


23 


.00 


.00 


.49 


22 




33 


7.6 


1.4 


.49 


24 


.00 


.00 


.49 


18 




23 


6.3 


2.0 


.66 


25 


.00 


.00 


.49 


15 




20 


3.8 


1.1 


.94 


26 


.00 


.00 


.49 


13 




34 


12 


1.1 


.56 


27 


.00 


.00 


.49 


11 




15 


9.9 


1.1 


.49 


28 


.00 


.00 


5.8 


9. 


4 


14 


8.9 


.98 


.47 


29 


.04 


.00 


15 


7. 








4.4 


.98 


.40 


30 


.02 


.00 


7.7 


5. 


8 





4.6 


.98 


.40 


31 


.00 





3.3 


5. 


6 





8.3 





.56 


TOTAL 


0.06 


0.00 


62.44 


980. 





284.4 


208.3 


84.14 


21.63 


MEAN 


.002 


.000 


2.01 


31. 


6 


10.2 


6.72 


2.80 


.70 


MAX 


.04 


.00 


15 


315 


34 


13 


10 


1.1 


MIN 


.00 


.00 


.00 


3. 


3 


1.9 


3.8 


.98 


.40 


AC-FT 


.1 


.00 


124 


1940 


564 


413 


167 


43 


e Es 


itimated. 



















48 


.04 


.00 


.00 


40 


.04 


.00 


.00 


38 


.04 


.00 


.00 


47 


.04 


.00 


.00 


46 


.04 


.00 


.00 


32 


.04 


.00 


.00 


32 


.03 


.00 


.00 


32 


.03 


.00 


.00 


32 


.03 


.00 


.00 


32 


.03 


.00 


.00 


31 


.03 


.00 


.00 


26 


.03 


.00 


.00 


21 


.03 


.00 


.00 


21 


.03 


.00 


.00 


21 


.02 


.00 


.00 


21 


.01 


.00 


.00 


21 


.01 


.00 


.00 


16 


.01 


.00 


.00 


18 


.01 


.00 


.00 


14 


.01 


.00 


.00 


10 


.01 


.00 


.00 


09 


.01 


.00 


.00 


09 


.01 


.00 


.00 


09 


.01 


.00 


.00 


09 


.01 


.00 


.00 


09 


.00 


.00 


.00 


09 


.00 


.00 


.00 


06 


.00 


.00 


.00 


04 


.00 


.00 


.00 


04 


.00 


.00 


.00 


-- 


.00 


.00 





67 


0.60 


0.00 


0.00 


22 


.019 


.000 


.000 


48 


.04 


.00 


.00 


04 


.00 


.00 


.00 


13 


1.2 


.00 


.00 



182 



SAN LORENZO CREEK BASIN 



11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA--Continuod 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1979 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.057 


1.02 


2.68 


7. 7* 


11.6 


8.77 


2.T, 


.71 


.21 


.054 


.011 


.006 


MAX 


.*5 


6.00 


lit.O 


35.5 


39.7 


5*. 3 


16.8 


3.56 


.95 


.25 


.12 


.079 


(WY) 


1983 


198* 


ige'i 


1982 


1982 


1983 


1982 


1983 


1983 


1982 


1983 


1983 


MIN 


.000 


.000 


.001 


.000 


.0*5 


.13 


.055 


.016 


.007 


.000 


.000 


.000 


(WY) 


1979 


1987 


1990 


1991 


1991 


1988 


1990 


1988 


1988 


1981 


1979 


1979 



SUhWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1979 - 1993 



318.94 






1648.24 




.87 






4.52 




32 


Feb 


12 


315 


Jan 13 


.00 


Jan 


1 


.00 


Oct 1 


.00 


Jan 


9 


.00 
953 
6.14 


Oct 1 
Jan 13 
Jan 13 


633 






3270 




2.2 






11 




.01 






.32 




.00 






.00 





2.93 








10.3 






1983 


.054 






1990 


445 


Feb 


15 


1982 


.00 


Oct 




1978 


.00 


Oct 




1978 


1690 


Jan 




1982 


8.71 


Jan 




1982 


2120 








4.8 








.08 








.00 









SAN LORENZO CREEK BASIN 183 

11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA- -Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1979 to current year (stortD season only). 
WATER TEMPERATURE: Water years 1979 to current year. 
SEDIMENT DATA: Water years 1979 to current year. 

PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: October 1978 to current year. 
SUSPENDED- SEDIMENT DISCHARGE: October 1978 to current year. 

REMARKS. — Zero bedload discharge observed at flows less than 4.1 ft /s. Sediment samples were collected on most days 
where a water temperature is published. 

EXTREMES FOR PERIOD OF DAILY RECORD. -- 

SEDIMENT CONCENTRATION: Maximum daily mean, Z'l.'iOO mg/L, Jan. 13, 1993; minimum daily mean, no flow many days 

during most years. 
SEDIMENT LOAD: Maximum daily, 26,400 tons, Feb. 17, 1986; minimum dally, tons many days during most years. 

EXTREMES FOR CURRENT YEAR.— 

SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 24, AGO mg/L, Jan. 13; minimum dally mean, no flow 

on many days . 
SEDIMENT LOAD (storm season only): Maximum daily, 20,800 tons, Jan. 13; minimum daily, tons on many days. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DIS- 






SEDI- 


SED. 


SED. 


SED. 






CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 






INST. 




SEDI- 


DIS- 


FALL 


FALL 


FALL 






CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 






FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


Z FINER 


Z FINER 


DATE 


TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 






SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.002 tm 


.004 m 


.008 M4 


DEC 


















09.. 


0910 


16 


12.0 


1120 


48 


— 


— 


— 


11.. 


0950 


5.2 


10.5 


205 


2.9 


— 


-- 


— 


28.. 


0950 


4.3 


8.0 


413 


4.8 


— 


-- 


— 


29.. 


0825 


22 


6.5 


2630 


156 


48 


62 


69 


30.. 


0825 


8.2 


5.0 


196 


4.3 


-- 


-- 


— 


30.. 


1335 


7.4 


7.5 


114 


2.3 


— 


-- 


— 


JAN 


















06.. 


1235 


6.0 


6.0 


57 


0.92 


— 


— 


— 


06.. 


1400 


6.6 


6.5 


34 


0.61 


— 


— 


— 


07.. 


1215 


31 


9.5 


490 


41 


— 


— 


— 


07.. 


1540 


71 


9.0 


5160 


989 


29 


30 


33 


lA.. 


1050 


38 


10.0 


1760 


180 


25 


33 


43 


21.. 


1100 


44 


12.0 


1440 


171 


27 


32 


41 


28.. 


0915 


9.3 


8.0 


70 


1.8 


— 


-- 


— 


FEB 


















04.. 


0920 


3.9 


9.0 


18 


0.19 


— 


— 


— 


04.. 


1055 


4.1 


9.0 


16 


0.18 


— 


— 


— 


09.. 


0740 


4.1 


9.5 


140 


1.6 


— 


-- 


— 


19.. 


0820 


24 


11.0 


1540 


100 


33 


41 


50 


26.. 


0845 


45 


7.5 


3760 


457 


29 


34 


40 


MAR 


















03.. 


1340 


7.9 


12.5 


94 


2.0 


-- 


— 


-- 


09.. 


1410 


5.2 


14.5 


92 


1.3 


-- 


— 


-- 


17.. 


0845 


24 


13.5 


2490 


161 


40 


53 


58 


28. . 


1635 


9.2 


13.0 


78 


1.9 


-- 


-- 


-- 



184 SAN LORENZO CREEK BASIN 

11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR. NEAR CASTRO VALLEY, CA--Continued 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993--Continued 







SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 






SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 






FALL 


FALL 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 






DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




Z 


FINER 


I FINER 


X FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE 




THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 






016 m 


.031 tti 


.062 ^t^ 


.125 hW 


.250 r*i 


.500 h*1 


1.00 »1 


2.00 ^M 


DEC 




















09.. 




-- 


— 


92 


— 


-- 


— 


— 





11.. 




-- 


— 


97 


99 


100 


-- 


— 





28.. 




-- 


-- 


96 


-- 


-- 


-- 


— 





29.. 




78 


85 


89 


92 


96 


100 


-- 


— 


30.. 




-- 


-- 


94 


97 


99 


100 


— 


— 


30.. 




-- 


— 


95 


— 


-- 


-- 








JAN 




















06.. 




— 


— 


84 


— 


— 











06.. 




— 


— 


91 


— 


— 


— 


— 





07.. 




— 


-- 


84 


89 


94 


99 


100 


— 


07.. 




45 


57 


66 


77 


89 


97 


100 





14.. 




54 


66 


76 


84 


91 


96 


99 


100 


21.. 




53 


64 


73 


81 


89 


95 


98 


99 


28.. 




-- 


-- 


82 


— 


-- 


-- 


— 


— 


FEB 




















04.. 




— 


— 


91 


— 


— 


— 


— 





04.. 




— 


— 


91 


— 


— 


— 








09.. 




— 


— 


98 


— 


— 


-- 


— 





19. . 




60 


69 


76 


82 


88 


97 


100 


__ 


26. . 




SO 


60 


68 


78 


88 


94 


97 


98 


MAR 




















03.. 




— 


— 


80 


— 


— 


— 


— 





09.. 




— 


— 


52 


— 


-- 


— 





__ 


17.. 




72 


83 


88 


92 


96 


99 


100 


-- 


28.. 








85 

DIS- 
CHARGE, 

INST. 




SEDI- 


SEDI- 
MENT, 
DIS- 


SED. 
SUSP. 
SIEVE 












CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 












FEET 


ATURE 


SUS- 


SUS- Z 


FINER 






DATE 


TIME 


PER 


WATER 


PENDED 


FENDED 


THAN 












SECOND 


(DEC C) 


(MG/L) 


(T/DAY) 


062 m 






APR 




















12 




1500 


2.4 


14.0 


78 


0.51 


83 






14 




1430 


1.8 


13.5 


17 


0.08 


70 





PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



















TIME 


HORI- 










BAG 


TETHER 






ON BED 


ZONTAL 










MESH 


LINE 


START- 


END- 


FOR 


WIDTH 






SAM- 




SIZE 


USED IN 


ING 


ING 


BED 


OF 






PLING 


SAMPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


DATE 


TIME 


METHOD , 


TYPE 


SAMPLER 


(YES=1) 


(2400 


(2400 


SAMPLE 


TICAL 






CODES 


(CODE) 


(Ml) 


(CODE) 


HOURS) 


HOURS 


(SEC) 


(FEET) 


DEC 




















11... 


1010 


1000 


1120 


0.250 





1000 


1020 


60 


0.4 


11. .. 


1035 


1000 


1120 


0.250 





1025 


1045 


60 


0.4 


30. . . 


1400 


1000 


1120 


0.250 





1350 


1405 


30 


0.3 


30. . . 


1425 


1000 


1120 


0.250 





1410 


1440 


30 


0.3 


JAN 




















06... 


1445 


1000 


1120 


0.250 





1435 


1450 


30 


0.3 


06... 


1515 


1000 


1120 


0.250 





1510 


1520 


30 


0.3 


14... 


1110 


1000 


1120 


0.250 





1100 


1120 


15 


0.5 


14... 


1130 


1000 


1120 


0.250 





1120 


1135 


15 


0.5 


MAR 




















09... 


1555 


1000 


1120 


0.250 





1545 


1605 


60 


0.5 


09... 


1625 


1000 


1120 


0.250 





1615 


1640 


60 


0.5 



SAN LORENZO CREEK BASIN 



185 



11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA— Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





CCMPSTD 


VER 








SAMPLE 


DIS- 




DISCH, 


SEDI- 




SAMPLES 


TICALS 


NUMBER 


LOC- 


CHARGE, 




BEDLOAD 


MENT 




IN 




IN 




OF 


ATION, 


INST. 




AV UNIT 


DIS- 




X-SEC 


COM- 


SAM- 


CROSS 


CUBIC 


TEMPER- 


FOR COM 


CHARGE, 




BEDLOAD 


POSITE 


PLING 


SECTION 


FEET 


ATURE 


POSITE 


BEDLOAD 


DATE 


MEASMNT 


SAMPLE 


POINTS 


(FT FM 


PER 


WATER 


SAMPLE 


(TONS/ 




(NUM) 


(NUM) 


(COUNT) 


L BANK) 


SECOND 


(DEG C) 


T/D/FT 


DAY) 


DEC 
























11... 




2 




17 




17 


1.40 


5.3 


10.5 


0.06 


0.54 


11... 




2 




17 




17 


1.40 


5.2 


10.5 


0.10 


0.54 


30... 




2 




27 




27 


1.40 


6.9 


7.5 


0.63 


5.6 


30... 




2 




27 




27 


1.40 


6.7 


7.5 


0.73 


5.6 


JAN 
























06... 




2 




21 




21 


1.60 


8.6 


6.5 


0.11 


0.67 


06... 




2 




21 




21 


1.60 


8.6 


6.5 


0.10 


0.67 


14... 




2 




26 




26 


0.50 


39 


10.0 


3.18 


42 


U... 




2 




26 




26 


0.50 


37 


10.0 


3.28 


42 


MAR 
























09... 




2 




17 




17 


1.75 


5.7 


14.5 


0.09 


0.72 


09... 




2 




17 




17 


1.75 


5.7 


14.5 


0.08 


0.72 




SED 




SED. 


SED. 


SED. 


SED. 


SED. 


SED. 


SED. 




BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




X FINER 


X FINER 


X FINER 


X FINER 


Z FINER 


X FINER 


X FINER 


X FINER 


DATE 


THAN 




THAN 




THAN 




THAN 


THAN 


THAN 


THAN 


THAN 




.250 


tl 


.500 


Wd 


1.00 


m 


2.00 (« 


4.00 m 


8.00 tW 


16.0 m 


32.0 m 


DEC 
























11... 


3 




24 




45 




60 


76 


90 


100 


-- 


11... 


2 




17 




35 




54 


72 


88 


93 


100 


30... 


1 




6 




28 




55 


80 


94 


100 


— 


30... 


1 




6 




22 




45 


71 


93 


100 


— 


JAN 
























06... 


2 




12 




27 




44 


62 


78 


85 


100 


06... 


2 




10 




21 




33 


46 


59 


76 


100 


U... 


4 




17 




30 




44 


65 


84 


96 


100 


14... 


4 




15 




31 




50 


70 


86 


97 


100 


MAR 
























09... 


2 




28 




67 




85 


94 


99 


100 


— 


09... 


2 




28 




70 




88 


96 


99 


100 


— 



DAY 



WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

INSTANTANEOUS VALUES 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 
2 
3 
4 
5 
8 
7 
B 
9 
10 

11 
12 
13 
14 
IS 
16 
17 
18 
19 
20 

21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 












9.0 





— 


— 


9.0 


8.0 
12.5 
12.5 


— 








9.0 


14.5 











13.0 


11.5 





6.5 


12.5 











9.0 


11.5 
9.5 


16.5 





12.0 


7.5 


14.5 














10.5 


15.0 


10.5 





12.5 

















15.0 


14.0 


5.0 





10.0 











10.0 








13.5 





11.0 

11.0 

9.5 


10.0 


14.5 





8.0 


10.0 


13.5 











12.0 


12.5 


15.0 





10.0 


11.0 











11.5 


9.5 


16.0 








12.0 


11.0 


16.0 


15.0 





11.5 


9.0 














10.0 


14.0 











10.5 


14.0 














11.5 


15.0 








7.5 

8.0 

11.0 


13.0 





8.0 


8.0 


13.0 


16.0 


6.5 


11.0 





11.0 





5.0 


10.0 








18.0 





9.0 





14.0 






15.0 



186 



SAN LORENZO CREEK BASIN 



11180960 CULL CREEK ABOVE CUU CREEK RESERVOIR, NEAR CASTRO VALLEY, CA— Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





MEAN 




DISCHARGE 


)AY 


(CFS) 


1 


.00 


2 


.00 


3 


.00 


4 


.00 


S 


.00 


6 


.00 


7 


.00 


8 


.00 


9 


.00 


10 


.00 


11 


.00 


12 


.00 


13 


.00 


1* 


.00 


15 


.00 


16 


.00 


17 


.00 


18 


.00 


19 


.00 


20 


.00 


21 


.00 


22 


.00 


23 


.00 


2A 


.00 


25 


.00 


26 


.00 


27 


.00 


28 


.00 


29 


.0* 


30 


.02 


31 


.00 



MEAN 

CONCEN- SEDIMENT 

TRATION DISCHARGE 

(MG/L) (TONS/DAY) 



OCTOBER 

eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 

eO 
eO 

eO 
eO 
eO 
eO 
eO 
eO 
eO 

eO 
eO 
eO 
eO 
eO 
eO 
eO 
el 
eO 
eO 
eO 



TOTAL 



0.06 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 

0.00 



MEAN 

DISCHARGE 

(CFS) 



MEAN 
CONCEN- SEDIMENT 
TRATION DISCHARGE 
(MG/L) (TONS/DAY) 

NOVEMBER 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 

.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



0.00 



eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 

eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 

eO 

eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 
eO 







MEAN 




n 


MEAN 


CONCEN- 


SEDIMENT 


IGE 


DISCHARGE 


TRATION 


DISCHARGE 


lY) 


(CFS) 


(MG/L) 
DECEMBER 


(TONS/DAY) 


00 


.00 


•0 


.00 


00 


.02 


aO 


.00 


00 


.02 


•0 


.00 


00 


.00 





.00 


00 


.00 


•0 


.00 


00 


.13 


•5 


.00 


00 


.05 


•0 


.00 


00 


.04 


el 


.00 


00 


12 


1390 


47 


00 


3.4 


el20 


1.1 


00 


3.8 


129 


1.3 


00 


1.8 


e70 


.34 


00 


1.0 


30 


.08 


00 


.69 


■19 


.04 


00 


.38 


■16 


.02 


00 


.49 


el4 


.02 


00 


1.3 


16 


.06 


00 


.81 


■8 


.02 


00 


.59 


■8 


.01 


00 


.49 


■9 


.01 


00 


.49 


■8 


.01 


00 


.49 


■7 


.01 


00 


.49 


■7 


.01 


00 


.49 


•7 


.01 


00 


.49 


■8 


.01 


00 


.49 


e8 


.01 


00 


.49 


e7 


.01 


00 


5.8 


2050 


33 


00 


15 


2840 


115 


00 


7.7 


227 


4.7 




3.3 


e27 


.24 



0.00 



62.44 



203.01 



1 
2 
3 
4 
5 
6 
7 
8 
9 
10 

11 
12 
13 
14 
15 
16 
17 
18 
19 
20 

21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 



TOTAL 

e Estimated 







JANUARY 




13 




e213 


7.3 


7. 


6 


e42 


.86 


4. 


6 


el8 


.22 


3. 


8 


el3 


.13 


3. 


3 


elO 


.09 


5. 


9 


454 


10 


e53 




4990 


957 


22 




el24 


7.3 


17 




84 


3.9 


15 




e63 


2.5 


15 




e62 


2.4 


27 




e826 


61 


315 




624400 


20800 


56 




5520 


827 


21 




624 


36 


17 




390 


18 


22 




712 


43 


18 




e436 


21 


12 




228 


7.6 


113 




19000 


5830 


73 




3340 


652 


39 




1840 


192 


22 




e500 


30 


18 




e275 


13 


15 




el80 


7.3 


13 




el45 


5.1 


11 




e74 


2.2 


9. 


4 


56 


1.4 


7. 





47 


.88 


5. 


8 


42 


.66 


5. 


6 


24 


.37 


980. 








29540.21 





FEBRUARY 




5.3 


e22 


.31 


4.6 


26 


.32 


4.2 


el5 


.17 


3.3 


15 


.13 


2.4 


el5 


.10 


2.4 


34 


.22 


2.5 


esg 


.26 


3.3 


123 


1.1 


4.7 


254 


3.2 


3.0 


e82 


.67 


3.1 


88 


.74 


2.5 


e60 


.41 


2.4 


55 


.35 


2.2 


e48 


.29 


2.2 


46 


.27 


1.9 


e45 


.23 


2.0 


62 


.34 


7.4 


1550 


31 


29 


1670 


131 


24 


970 


63 


19 


406 


21 


14 


305 


11 


33 


736 


66 


23 


274 


17 


20 


e203 


11 


34 


2850 


265 


15 


216 


9.0 


14 


167 


5.4 



MARCH 



10 


112 


8.6 


93 


7.9 


108 


7.0 


90 


7.1 


91 


6.6 


•81 


6.0 


70 


5.4 


•57 


5.1 


81 


4.9 


69 


4.9 


■60 


4.7 


52 


4.1 


•41 


4.1 


■37 


4.2 


39 


4.8 


e4g 


13 


1170 


11 


195 


5.7 


el20 


4.9 


250 


6.9 


160 


5.6 


■80 


7.6 


233 


6.3 


159 


3.8 


70 


12 


239 


9.9 


e97 


8.9 


64 


4.4 


74 


4.6 


•104 


8.3 


102 



1.6 
1.5 
1.2 

.83 
1.1 

.91 

.79 
.66 
.45 
.41 
.44 
.65 



39 
5. 

1. 
3, 



284.4 



641.51 



208.3 



3.0 
1.2 
4.8 
2.7 

.72 
7.7 
2.6 
1.5 

.87 
1.3 
2.3 

98.44 



SAN LORENZO CREEK BASIN 187 

11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA— Continued 

SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

MEAN 

MEAN CONCEN- SEDIMENT 

DISCHARGE TRATION DISCHARGE 

DAY (CFS) (MG/L) (TONS/DAY) 

APRIL 



1 


10 


ell2 


3.1 


2 


7.1 


659 


1.1 


3 


6.2 


647 


.80 


4 


5.8 


42 


.67 


5 


5.4 


37 


.55 


6 


5.0 


633 


.46 


7 


4.0 


623 


.25 


8 


3.2 


635 


.35 


9 


2.7 


640 


.28 


10 


2.4 


36 


.23 


11 


2.4 


633 


.21 


12 


2.2 


49 


.29 


13 


2.0 


642 


.23 


14 


1.9 


17 


.09 


15 


1.8 


617 


.08 


16 


1.8 


617 


.08 


17 


2.4 


627 


.18 


18 


2.0 


68 


.37 


19 


1.7 


642 


.19 


20 


1.7 


632 


.15 


21 


1.7 


30 


.13 


22 


1.1 


629 


.09 


23 


1.4 


640 


.15 


24 


2.0 


669 


.37 


25 


1.1 


32 


.10 


26 


1.1 


632 


.10 


27 


1.1 


635 


.10 


28 


.98 


46 


.12 


29 


.98 


646 


.12 


30 

31 

TOTAL 


.98 


46 


.12 


84.14 


— 


11.06 


PERIOD 


1619.34 




30494.23 



e Estimated. 



SUW1ARY OF WATER AND SEDIMENT DISCHARGE, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







WATER 


SUSPENDED 


BEDLOAD 


TOTAL 


MONTH 




DISCHARGE 


SEDIMENT 
DISCHARGE 


DISCHARGE 


SEDIMENT 
DISCHARGE 






CFS-DAYS 


TONS 


TONS 


TONS 


OCTOBER 


1992 


0.06 


0.00 








NOVEMBER 


.... 


0.00 


0.00 








DECEMBER 


.... 


62.44 


203.01 


58 


261 


JANUARY 


1993 


980.00 


29540.21 


1320 


30900 


FEBRUARY 




284.40 


641.51 


216 


858 


MARCH . . . 




208.30 


98.44 


163 


261 


APRIL ... 


.... 


84.14 


11.06 


23 


34 


PERIOD . . 




1619.34 


30494.23 


1780 


32314 



188 



SAN LORENZO CREEK BASIN 
11181006 CASTRO VALLEY CREEK AT KNOX STREET, AT CASTRO VALLEY, CA 



LOCATION. --Lat 37'«0'56", long 122*0*'**", in Sein Lorenzo (Castro) Grant, Alameda County, Hydrologlc Unit 
1805000*, on left bank at Knox Street, 1.0 ml southeast of Castro Valley Post Office. 

DRAINAGE AREA.— 2.20 mi^. 

PERIOD OF RECORD. --October 1978 to September 1980, October 1989 to September 1993 (discontinued). 

GAGE. --Water-stage recorder and concrete control. Elevation of gage is 130 ft above sea level, from topographic 
map. 

REMARKS. --Records poor. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 873 ft^/s. Oct. 23, 1989. and Jan. 20, 1993, gage height, 
6.69 ft, from rating curve extended above 160 ft /s; no flow some days in most years. 

EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 300 ft^/s and maximum (*): 



Date 



Discharge Gage height 
Time (ft^/s) (ft) 



Dec. 


9 


0**5 


327 


*.43 


Jan. 


13 


0*30 


303 


*.29 



Date 
Jan. 20 



Time 
1800 



Discharge Gage height 
(ft^/s) (ft) 



*873 



*6.69 



Minimum daily, 0.01 ff'/s, Oct. 5. 7. 8. 10. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



Jin, 



AUG 



SEP 



1 


.02 


e.l7 


.16 


e25 


e.54 


1.4 


el.l 


6.32 


.22 


.13 


6.11 


.11 


2 


.04 


.05 


e5.5 


1.2 


.56 


1.2 


e.6* 


6.31 


.22 


.13 


6.11 


.16 


3 


.03 


.05 


.58 


.77 


e.40 


1.1 


e.56 


el.l 


.12 


.11 


6.09 


.19 


4 


.03 


.04 


.14 


.53 


e.36 


.77 


el. 5 


e.30 


2.5 


.10 


.07 


.09 


S 


.01 


.05 


.08 


.36 


el.O 


.76 


e.52 


e.32 


.18 


.09 


.08 


.07 


6 


.02 


.06 


el7 


8.1 


e.3* 


.68 


e.52 


6.30 


.22 


.16 


.08 


.06 


7 


.01 


.06 


5.8 


el8 


2.8 


.49 


e.52 


e.30 


.22 


6.09 


.08 


.06 


8 


.01 


.05 


5.5 


7.6 


e5.2 


.35 


6.96 


6.29 


.19 


6.07 


.06 


.06 


9 


.03 


.05 


36 


el. 9 


e2.8 


.49 


e.** 


6.29 


.19 


e.06 


.14 


.05 


10 


.01 


.05 


elO 


1.3 


el. 4 


.51 


e.*4 


6.36 


.19 


e.05 


.12 


.05 


11 


.02 


.07 


3.9 


.78 


e2.1 


e.39 


e.38 


e.30 


.19 


6.06 


.08 


.05 


12 


.02 


.04 


.51 


22 


.68 


e.38 


e.37 


6.23 


.20 


6.07 


.08 


.05 


13 


.03 


.08 


.33 


e65 


.59 


e.60 


e.36 


6.28 


.22 


e.05 


.07 


.04 


14 


.02 


.10 


.30 


elO 


.56 


e.76 


e.36 


.17 


.23 


e.05 


.07 


.03 


15 


.04 


.10 


.24 


e5.8 


.55 


0.34 


e.44 


.23 


.19 


6.07 


.07 


.03 


16 


.03 


.07 


.19 


2.6 


e.34 


e4.8 


e.*8 


.18 


.19 


6.05 


.06 


.03 


17 


.02 


.10 


e3.3 


elO 


1.8 


eS.O 


e4.8 


.14 


.19 


6.05 


.06 


.07 


18 


.02 


.13 


.28 


e9.5 


el3 


e3.8 


el. 2 


.13 


.19 


e.06 


.06 


.06 


19 


.02 


.*g 


.25 


1.8 


el6 


e.68 


6.40 


.13 


.22 


e.og 


.06 


.06 


20 


2.2 


.11 


.31 


e31 


elO 


6.52 


6.39 


.13 


.19 


e.07 


.07 


.06 


21 


1.2 


.09 


.19 


ell 


6.9 


e.48 


e.35 


.15 


.19 


e.06 


.67 


.06 


22 


.02 


.24 


.19 


e3.5 


e2.2 


e.44 


6.36 


.19 


.21 


e.06 


.09 


.14 


23 


.02 


.07 


.20 


2.6 


ell 


e6.* 


6*.* 


.19 


.26 


6.06 


.09 


.05 


24 


.02 


.07 


.22 


2.0 


3.3 


e2.7 


e.68 


3.1 


.28 


e.07 


.07 


.06 


25 


.02 


.07 


.22 


1.5 


el. 7 


e3.7 


e.38 


.66 


.26 


e.06 


.10 


.08 


26 


.03 


.07 


.20 


1.2 


el2 


e3.2 


6.35 


.83 


.20 


6.11 


.10 


.09 


27 


.04 


.09 


.19 


1.1 


2.5 


e6.0 


6.34 


.31 


.16 


e.07 


.09 


.08 


28 


.04 


.11 


18 


.93 


2.0 


el.l 


6.32 


.25 


.15 


6.09 


.09 


.09 


29 


el* 


e.08 


14 


.73 





e.72 


e.32 


.52 


.11 


6.16 


.09 


.12 


30 


2.0 


e.O* 


2.5 


.66 





e.60 


6.34 


.86 


.13 


6.19 


.10 


.11 


31 


.06 





.81 


.59 





e4.0 





.24 





6.14 


.09 





TOTAL 


20.08 


2.85 


127.09 


249.05 


102.62 


57.36 


24.22 


13.11 


8.21 


2.68 


3.20 


2.26 


MEAN 


.65 


.095 


4.10 


8.03 


3.66 


1.85 


.81 


.42 


.27 


.086 


.10 


.075 


MAX 


1* 


.49 


36 


65 


16 


8.0 


4.8 


3.1 


2.5 


.19 


.67 


.19 


MIN 


.01 


.04 


.08 


.36 


.34 


.34 


.32 


.13 


.11 


.05 


.06 


.03 


AC-FT 


40 


5.7 


252 


494 


204 


114 


48 


26 


16 


5.3 


6.3 


4.5 


e Estimated. 

























SAN LORENZO CREEK BASIN 



1S9 



11181006 CASTRO VALLEY CREEK AT KNOX STREET, AT CASTRO VALLEY, CA--ContinuGd 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1979 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JIW 



JUL 



AUG 



SEP 



MEAN 


.71 


.40 


1.42 


2.86 


3.90 


1.84 


.42 


.38 


.17 


.051 


.053 


.034 


MAX 


1.55 


.85 


4.10 


8.03 


7.56 


4.16 


.81 


1.05 


.38 


.086 


.10 


.075 


(WY) 


1990 


1990 


1993 


1993 


1980 


1991 


1993 


1990 


1992 


1993 


1993 


1993 


MIN 


.015 


.095 


.028 


.098 


1.14 


.41 


.28 


.071 


.028 


.016 


.019 


.019 


(WY) 


1979 


1993 


1990 


1991 


1990 


1990 


1990 


1992 


1979 


1979 


1979 


1991 



SUmARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1979 - 1993 



408.71 
1.12 






36 
.01 

.01 


Dec 
Aug 
Sep 


9 
29 
12 


811 
2.1 
.07 
.02 







612.73 






1.68 






65 


Jan 


13 


.01 


Oct 


5 


.02 


Oct 


5 


873 


Jan 


20 


6.69 


Jan 


20 


1220 






3.8 






.21 






.05 







.94 








1.68 






1993 


.55 






1990 


65 


Jan 


13 


1993 


.00 


Sep 


18 


1990 


.00 


Oct 


8 


1990 


873 


Oct 


23 


1989 


6.69 


Oct 


23 


1989 


679 








1.8 








.08 








.01 









190 



SAN LORENZO CREEK BASIN 
1118:008 CASTRO VALLEY CREEK AT HAYWARD, CA 



LOCATION. --Lat 37*«0'«8", long 122"04'«6", In San Lorenzo (Castro) Grant, Alameda County. Hydrologlc Unit 

1805000*, on loft bank 500 ft east of Hayward City Hall, 700 ft upstream from mouth, and 700 ft downstream 
from small left-bank tributary, 

DRAINAGE AREA. --5. 51 ml^. 

PERIOD OF RECORD. — October 1971 to current year (seasonal records only, water years 1975-77). 

(>AGE. --Water-stage recorder and crest-stage gage. Elevation of gage is 100 ft above sea level, from topographic 
map. 

REMARKS. --No estimated daily discharges. Records fair. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD ^--Maximum discharge, 1,350 ft^/s, Jan. 23, 1983, gage height, 8.51 ft, from rating 
curve extended above 61 ft /s on basis of slope-area measurement at gage height 3.92 ft and step-backwater 
computation to gage height 10.40 ft; no flow at times. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 500 ft^/s and maximum (*): 

Discharge Gage height Discharge 

Date Time (ft^/s) (ft) Date Time (ft^/s) 



Jan. 13 



0435 



e^o 



5.89 



Jan. 20 



1730 



*1,260 



Minimum daily, 0.08 ft^/s, Oct. 7. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



Gage height 
(ft) 

*8.23 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.12 


.4* 


.14 


64 


1.2 


2.2 


2.5 


.79 


.58 


.42 


.35 


.29 


2 


.13 


.22 


19 


3.7 


1.4 


1.9 


1.6 


.78 


.55 


.41 


.32 


.31 


3 


.10 


.19 


1.5 


2.0 


.97 


2.1 


1.4 


2.7 


.51 


.39 


.32 


.31 


4 


.10 


.17 


.26 


1.5 


.91 


1.5 


3.7 


.76 


6.6 


.41 


.31 


.29 


S 


.09 


.23 


.21 


1.5 


2.0 


1.4 


1.3 


.80 


.63 


.41 


.31 


.29 


6 


.09 


.26 


42 


30 


.83 


1.3 


1.3 


.74 


.51 


.40 


.32 


.31 


7 


.08 


.17 


13 


52 


11 


1.3 


1.3 


.74 


.51 


.45 


.31 


.30 


e 


.09 


.17 


14 


16 


13 


1.3 


2.4 


.73 


.52 


.40 


.31 


.30 


9 


.11 


.46 


82 


6.4 


5.4 


1.1 


1.1 


.73 


.50 


.43 


.34 


.29 


10 


.10 


.14 


29 


3.1 


2.9 


1.0 


1.1 


.99 


.49 


.37 


.36 


.31 


11 


.09 


.15 


12 


1.9 


5.0 


.98 


.94 


.85 


.54 


.40 


.37 


.31 


12 


.09 


.33 


1.6 


58 


1.2 


.94 


.92 


.69 


.53 


.39 


.31 


.32 


13 


.11 


.15 


1.0 


163 


1.0 


1.5 


.90 


.69 


.49 


.35 


.29 


.33 


14 


.10 


.15 


.83 


31 


.96 


1.9 


.89 


.67 


.52 


.37 


.29 


.29 


IS 


.10 


.14 


.73 


13 


.92 


.85 


1.1 


.72 


.51 


.35 


.30 


.28 


16 


.11 


.17 


.65 


5.2 


.86 


12 


1.2 


1.0 


.56 


.36 


.31 


.27 


17 


.11 


.17 


8.3 


28 


3.5 


20 


12 


.69 


.52 


.35 


.30 


.35 


18 


.10 


.18 


.83 


13 


32 


9.6 


3.0 


.70 


.51 


.37 


.32 


.31 


19 


.10 


1.4 


.71 


4.5 


40 


1.7 


1.0 


.70 


.52 


.35 


.29 


.33 


20 


4.7 


.18 


.61 


77 


27 


1.3 


.98 


.73 


.49 


.35 


.30 


.36 


21 


2.9 


.15 


.58 


32 


12 


1.2 


.87 


.69 


.55 


.35 


.77 


.30 


22 


.12 


.33 


.53 


11 


5.8 


1.1 


.91 


.68 


.47 


.33 


.29 


.35 


23 


.10 


.16 


.48 


5.4 


28 


16 


11 


.70 


.48 


.35 


.29 


.27 


24 


.10 


.17 


.48 


3.8 


5.6 


6.7 


1.7 


10 


.45 


.36 


.30 


.29 


2S 


.09 


.17 


.48 


2.9 


4.5 


9.3 


.95 


.94 


.46 


.35 


.34 


.28 


26 


.10 


.16 


.48 


2.3 


32 


8.1 


.88 


2.9 


.45 


.34 


.32 


.26 


27 


.11 


.15 


.48 


1.9 


4.3 


15 


.85 


1.3 


.44 


.36 


.32 


.24 


28 


.13 


.15 


45 


1.7 


3.0 


2.8 


.81 


.66 


.43 


.35 


.31 


.25 


29 


37 


.13 


26 


1.5 





1.8 


.81 


.61 


.41 


.33 


.30 


.27 


30 


6.1 


.11 


6.8 


1.3 





1.5 


.84 


1.4 


.43 


.33 


.32 


.28 


31 


.23 





1.9 


1.2 





10 





2.6 





.33 


.30 





TOTAL 


53.62 


7.15 


311.58 


639.8 


247.25 


139.37 


60.25 


39.68 


21.16 


11.51 


10.19 


8.94 


MEAN 


1.73 


.24 


10.1 


20.6 


8.83 


4.50 


2.01 


1.28 


.71 


.37 


.33 


.30 


MAX 


37 


1.4 


82 


163 


40 


20 


12 


10 


6.6 


.45 


.77 


.36 


MIN 


.08 


.11 


.14 


1.2 


.83 


.85 


.81 


.61 


.41 


.33 


.29 


.24 


AC-FT 


106 


14 


618 


1270 


490 


276 


120 


79 


42 


23 


20 


18 



SAN LORENZO CREEK BASIN 



191 



11181008 CASTRO VALLEY CREEK AT HAYWARD, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1972 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


1.77 


A. 69 


5.07 


8.31 


9.49 


7.63 


2.77 


.88 


.52 


.38 


.35 


.55 


MAX 


4.97 


19.0 


12.8 


24.6 


25.5 


34.6 


12.3 


3.23 


.78 


1.15 


1.50 


1.62 


(Wlf) 


1976 


1974 


1984 


1982 


1986 


1983 


1974 


1990 


1974 


1974 


1983 


1983 


MIN 


.15 


.24 


.24 


.39 


1.06 


.60 


.20 


.30 


.28 


.17 


.14 


.12 


(W5f) 


1978 


1993 


1990 


1991 


1977 


1988 


1977 


1992 


1980 


1991 


1980 


1980 



SUmARY STATISTICS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1972 - 1993 



ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
INSTANTANEOUS LOW FLOW 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
SO PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



1063.56 
2.91 



94 Feb 12 
.08 Oct 7 
.09 Oct 5 



2110 
5.0 
.26 
.15 



1550.50 






4.25 






163 


Jan 


13 


.08 


Oct 


7 


.09 


Oct 


5 


1260 


Jan 


20 


8.23 


Jan 


20 


3080 






11 






.56 






.15 







3.76 








8.76 






1983 


1.51 






1972 


322 


Jan 


4 


1982 


.00 


Oct 


11 


1977 


.00 


Oct 


11 


1977 


1350 


Jan 


23 


1983 


8.51 


Jan 


23 


1983 


.08 


Oct 


7 


1992 


2730 








6.0 








.46 








.17 









192 



SAN LORENZO CREEK BASIN 
111810A0 SAN LORENZO CREEK AT SAN LORENZO, CA 



LOCATION. --Lat 37'«1'03". long 122'08'20". in San Lorenzo (Soto) Grant, Alameda County. Hydrologic Unit 18050004, 
on loft bank 400 ft downstream from Washington Avenue Bridge in San Lorenzo and 1.6 mi upstream from mouth. 

DRAINAGE AREA. --44. 6 mi^. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. — October 1967 to September 1978, October 1987 to current year. 

GAGE. — Water-Stage recorder and crest-stage gage. Datum of gage is 6.13 ft above sea level (levels by Alameda 
County Flood Control and Water Conservation District). 

REMARKS. --No estimated daily discharges. Records good. Flow partly regulated by Cull Creek Reservoir beginning 
in October 1962 (capacity, 310 acre-ft) and Don Castro Reservoir (capacity, 380 acre-ft) 7 mi upstream 
beginning in January 1965. A few very small diversions upstream from station. 

EXTREMES FOR PERIOD OF RECORD .- -Maximum discharge, 5,300 ft^/s, Jan. 13, 1993, gage height, 9.19 ft from rating 
curve extended above 1,200 ft /s; minimum daily, 0.01 ft /s, several days in June and July, 1977. 

EXTREMES FOR CURRENT YEAR.— Peak discharges greater than base discharge of 850 ft^/s and maximum (*): 







Discharge 
(ft^/s) 


Gag 


e height 






Discharge 
(ft^/s) 


Gag 


e heij 


Date 


Time 




(ft) 


Date 


Time 




(ft) 


Oct. 21 


0010 


923 




5.34 


Jan. 7 


1440 


1,070 




5.51 


Oct. 29 


1005 


1.010 




5.44 


Jan. 13 


0800 


*5,300 




•9.19 


Dec. 6 


161S 


1,720 




6.18 


Jan. 20 


1935 


2,640 




7.09 


Dec. 8 


0500 


3,390 




7.75 


Feb. 18 


2315 


1,480 




5.94 


Dec. 28 


1045 


1,020 




5.46 


Feb. 26 


0650 


894 




5.31 


Jon. 1 


0520 


2,150 




6.62 













Minimum daily, 0.25 ft^/s, Sept. 1. 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.48 


13 


2.7 


541 


29 


56 


45 


13 


28 


8.4 


.99 


.25 


2 


.49 


11 


S3 


57 


28 


50 


35 


13 


26 


7.8 


1.0 


.28 


3 


.48 


9.8 


30 


36 


27 


45 


34 


17 


26 


7.6 


.94 


.38 


4 


.49 


9.2 


21 


28 


24 


41 


39 


12 


44 


7.9 


.99 


.34 


S 


.46 


8.7 


17 


27 


24 


39 


34 


9.8 


27 


7.3 


1.0 


.34 


6 


.44 


8.6 


196 


88 


22 


37 


35 


9.1 


17 


6.5 


1.0 


.44 


7 


.43 


7.5 


56 


513 


33 


36 


36 


8.7 


16 


6.2 


.81 


.48 


8 


.40 


7.0 


42 


158 


43 


35 


36 


8.2 


17 


5.5 


.54 


.49 


9 


.45 


7.0 


576 


70 


41 


34 


36 


7.8 


18 


5.5 


.56 


.49 


10 


.43 


5.9 


144 


50 


26 


33 


33 


7.8 


18 


4.8 


.52 


.58 


11 


.45 


5.2 


57 


42 


34 


32 


32 


7.5 


19 


4.7 


.45 


.72 


12 


.52 


5.3 


27 


297 


25 


31 


31 


7.5 


18 


4.2 


.40 


.75 


13 


.55 


4.4 


22 


1970 


24 


31 


31 


6.8 


18 


3.7 


.56 


.91 


U 


.65 


4.0 


21 


333 


22 


33 


31 


5.5 


18 


3.2 


.70 


.97 


15 


.38 


3.9 


20 


126 


22 


30 


31 


8.1 


17 


3.1 


.62 


1.0 


16 


.43 


4.1 


19 


85 


21 


44 


29 


16 


17 


2.9 


.66 


1.2 


17 


.45 


4.0 


34 


141 


26 


94 


48 


18 


16 


2.7 


.56 


1.7 


18 


.49 


3.4 


22 


104 


128 


54 


36 


24 


IS 


2.5 


.45 


2.0 


19 


.46 


4.1 


19 


61 


463 


33 


25 


33 


13 


2.0 


.46 


2.2 


20 


4.6 


3.3 


18 


511 


281 


31 


24 


40 


13 


1.4 


.55 


2,4 


21 


38 


2.9 


18 


295 


128 


30 


23 


44 


14 


1.1 


.76 


2.4 


22 


11 


3.3 


18 


237 


77 


29 


22 


46 


13 


1.1 


.41 


2.7 


23 


9.4 


3.0 


18 


94 


175 


57 


32 


44 


12 


1.1 


.43 


2.6 


24 


9.0 


2.8 


18 


66 


83 


51 


30 


71 


12 


1.0 


.48 


2.4 


25 


9.2 


2.7 


18 


54 


65 


41 


20 


46 


11 


.99 


.49 


2.3 


26 


10 


2.5 


18 


46 


259 


61 


18 


38 


9.6 


.96 


.44 


1.8 


27 


10 


2.7 


18 


48 


86 


70 


17 


36 


9.5 


1.0 


.43 


1.9 


26 


10 


2.7 


214 


42 


67 


47 


16 


31 


9.0 


1.0 


.40 


1.7 


29 


161 


2.5 


136 


37 





38 


15 


29 


9.9 


.95 


.39 


1.1 


30 


32 


2.6 


68 


33 





36 


14 


29 


10 


.99 


.38 


1.0 


31 


14 





35 


30 





49 





40 





.94 


.38 





TOTAL 


327.13 


157.1 


1975.7 


6220 


2283 


1328 


888 


726.8 


511.0 


109.03 


18.75 


37.82 


MEAN 


10.6 


5.24 


63.7 


201 


81.5 


42.8 


29.6 


23.4 


17.0 


3.52 


.60 


1.26 


MAX 


161 


13 


576 


1970 


463 


94 


48 


71 


44 


8.4 


1.0 


2.7 


MIN 


.38 


2.5 


2.7 


27 


21 


29 


14 


5.5 


9.0 


.94 


.38 


.25 


AC-FT 


649 


312 


3920 


12340 


4530 


2630 


1760 


1440 


1010 


216 


37 


75 



SAN LORENZO CREEK BASIN 



193 



11181040 SAN LORENZO CREEK AT SAN LORENZO, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1968 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 5.93 S.02 


23.3 


59.8 


48.3 


37 


.8 


20.3 


6.58 




3.45 


1.52 


1 


.30 


1.84 


MAX 30.2 38.1 


106 


201 


183 


92 


.7 


108 


23.4 




17.0 


3.52 


3 


.25 


4.58 


(HY) 1992 1974 


1971 


1993 


1969 


1975 


1974 


1993 




1993 


1993 


1969 


1975 


HIN .23 1.49 


1.41 


1.14 


2.15 


1.1 


33 


2.07 


.85 




.066 


.64 




.11 


.35 


(HY) 1976 1991 


1990 


1991 


1977 


1972 


1976 


1972 




1977 


1990 


1977 


1988 


SUWIARY STATISTICS 


FOR 


1992 CALENDAR YEAR 






FOR 1993 WATER YEAR 




WATER YEARS 


1968 - 


1993 


ANNUAL TOTAL 




6793.64 








14582.33 
















ANNUAL MEAN 




18.6 








40.0 








18.1 








HIGHEST ANNUAL MEAN 




















40.9 






1974 


LOWEST ANNUAL MEAN 




















2.38 






1977 


HIGHEST DAILY MEAN 




919 


Feb 12 






1970 


Jan 


13 




2400 




Jan 21 


1970 


LOWEST DAILY MEAN 




.35 


Sep 11 






.25 


Sep 


1 




.01 




Jun 12 


1977 


ANNUAL SEVEN-DAY MINIMUM 




.41 


Sep 8 






.34 


Aug 


30 




.01 




Jun 10 


1977 


INSTANTANEOUS PEAK FLOW 












5300 


Jan 


13 




5300 




Jan 13 


1993 


INSTANTANEOUS PEAK STAGE 












9.19 


Jan 


13 




9.19 




Jan 13 


1993 


ANNUAL RUNOFF (AC-FT) 




13480 








28920 








13080 








10 PERCENT EXCEEDS 




32 








66 








39 








50 PERCENT EXCEEDS 




2.7 








16 








2.2 








90 PERCENT EXCEEDS 




.47 








.49 








.54 









194 SAM LORENZO CREEK BASIN 

11181040 SAN LORENZO CREEK AT SAN LORENZO, CA--Contlnued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --October 1989 to September 1993 (storm season only). 
WATER TEMPERATURE: October 1989 to September 1993 (discontinued). 
SEDIMENT DATA: October 1989 to September 1993 (discontinued). 
PERIOD OF DAILY RECORD.— 

WATER TQ1PERATURE: October 1989 to September 1993 (discontinued). 
SUSPENDED-SEDIMENT DISCHARGE: October 1989 to September 1993 (discontinued). 
RQURKS. --Sediment samples were collected on most days where water temperature is published. Zero-badload 

discharge observed for flows less than 33 ft /a. 
EXTREMES FOR PERIOD OF RECORD.— 

SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 3,830 mg/L, Jan. 13, 1993; minimum daily mean, 

1 mg/L, many days in roost years. 
SEDIMENT LOAD (storm season only): Maximum daily, 26,800 tons, Jan. 13, 1993; minimum daily, tons, many days 
in 1991 and 1992 and several days in 1993. 
EXTREMES FOR CURRENT YEAR.— 

SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 3,830 mg/L, Jan, 13; minimum dally mean, 

1 mg/L on several days. 
SEDIMENT LOAD (storm season only): Maximum daily, 26,800 tons, Jan. 13; minimum daily, tons on several days. 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



OCT 

14. .. 
NOV 

19. .. 
FEB 

03... 
MAR 

10. . . 



TIME 

1010 
1550 
1450 
1150 



DIS- 






SEDI- 


SED. 


CBARGE, 






MENT, 


SUSP. 


INST. 




SEDI- 


DIS- 


SIEVE 


CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


FEET 


ATURE 


SUS- 


SUS- 


X FINER 


PER 


WATER 


PENDED 


PENDED 


THAN 


SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.062 m 


0.45 


17.0 


10 


0.01 


40 


10 


15.0 


54 


1.5 


98 


29 


10.5 


16 


1.3 


93 


33 


14.5 


44 


3.9 


84 



DAY 

1 
2 
3 
4 
5 

6 
7 
8 
9 
10 

11 
12 
13 
14 
IS 

16 
17 
18 
19 
20 

21 
22 
23 
24 
25 

26 
27 
28 
29 
30 
31 

MAX 

MIN 



OCT 

21 
24 

21.5 
20.5 



17 
19 



17 
18.5 



20.5 
20.5 



19.5 
18 



21 



20 

15.5 

18 

17.5 



WATER 
NOV 

15 
17 

15.5 
11 

11.5 

12 

11.5 
15 

12.5 
11 

10.5 
10.5 



TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



11 
12 
8.S 



12.5 

11.5 

11.5 

13 

14 

11.5 

9.5 

8 

8.5 
6.5 

8.S 

8 
7 

6 

9.0 

7.5 

8.5 

10.0 



JAN 



6.5 
5.5 



8 

8.5 
9 
9 



7 

11.5 
11.5 
11.5 

10.5 
10.5 

10.5 
12 

12.5 
11.5 
9.5 
10 



9.5 
9.5 

10 

9.5 



FEB 



10.5 
10.5 



12 



13.0 
11.5 
11.5 



13.5 



10.5 

11.5 

13 

11.0 

10 

10.5 

11 

10.5 

10 

10 

9 
9 



MAR 
11.5 
12 

14.5 

14.5 
16.5 
15 
15 

14.5 

16 
14 
14.5 

13 
13 
13.5 

18 



APR 



16 
16 



15 

18.5 

13.5 

20 
17 

16 
14 

17.5 

16 

21.5 

20.5 
21.5 
21.5 



MAY 



JUN 



JUL 



AUG 



19.5 



SEP 



22 



SAN LORENZO CREEK BASIN 



19S 



111810'iO SAN LORENZO CREEK AT SAN LORENZO, CA— Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 









MEAN 








MEAN 






MEAN 






MEAN 


CONCEN- 


SEDIMENT 


MEAN 


CONCEN- 


SEDIMENT 


MEAN 


CONCEN- 


SEDIMENT 




DISCHARGE 


TRATION 


DISCHARGE 


DISCHARGE 


TRATION 


DISCHARGE 


DISCHARGE 


TRATION 


DISCHARGE 


MY 


(CFS) 


(MG/L) 


(TONS /DAY) 


(CFS) 


(MG/L) 


(TONS/DAY) 


(CFS) 


(MG/L) 


(TONS /DAY) 








OCTOBER 








NOVEMBER 






DECEMBER 




1 




.48 


10 




.01 


13 


2 


.07 


2.7 


3 


.02 


2 




.49 


11 




.01 


11 


2 


.06 


53 


99 


43 


3 




.48 


13 




.02 


9.8 


2 


.05 


30 


15 


1.9 


4 




.49 


14 




.02 


9.2 


1 


.02 


21 


2 


.11 


S 




.46 


11 




.01 


8.7 


1 


.02 


17 


3 


.13 


6 




.44 


8 




.01 


8.6 


1 


.03 


196 


122 


160 


7 




.43 


6 




.01 


7.5 


2 


.03 


56 


54 


16 


8 




.40 


5 




.00 


7.0 


2 


.03 


42 


37 


9.4 


9 




.45 


4 




.00 


7.0 


2 


.03 


576 


551 


1960 


10 




.43 


4 




.00 


5.9 


1 


.02 


144 


211 


142 


11 




.45 


3 




.00 


5.2 


1 


.01 


57 


103 


17 


12 




.52 


2 




.00 


5.3 


1 


.02 


27 


35 


2.6 


13 




.55 


3 




.00 


4.4 


2 


.03 


22 


19 


1.1 


U 




.65 


4 




.01 


4.0 


3 


.03 


21 


10 


.57 


IS 




.38 


6 




.01 


3.9 


4 


.04 


20 


5 


.27 


16 




.43 


6 




.01 


4.1 


4 


.04 


19 


4 


.21 


17 




.45 


6 




.01 


4.0 


3 


.03 


34 


40 


4.7 


18 




.49 


7 




.01 


3.4 


3 


.03 


22 


13 


.82 


19 




.46 


7 




.01 


4.1 


22 


.31 


19 


6 


.29 


20 


4 


.6 


60 


26 




3.3 


23 


.20 


18 


5 


.25 


21 


38 




240 


112 




2.9 


19 


.15 


18 


4 


.18 


22 


11 




12 




.36 


3.3 


16 


.14 


18 


3 


.15 


23 


9 


.4 


3 




.08 


3.0 


14 


.11 


18 


2 


.10 


24 


9 


.0 


3 




.07 


2.8 


11 


.08 


18 


2 


.10 


2S 


9 


.2 


3 




.07 


2.7 


7 


.05 


18 


3 


.13 


26 


10 




4 




.11 


2.5 


5 


.03 


18 


4 


.17 


27 


10 




5 




.15 


2.7 


3 


.02 


16 


4 


.19 


28 


10 




5 




.14 


2.7 


2 


.02 


214 


350 


518 


29 


161 




240 


375 




2.5 


2 


.01 


136 


209 


91 


30 


32 




33 


7 


.0 


2.6 


2 


.02 


68 


123 


25 


31 


14 




4 




.14 











35 


42 


4.1 


•OTAL 


327 







521 


.27 


157.1 





1.73 


1975.7 





2999.49 







JANUARY 






FEBRUARY 




1 


541 


936 


2330 


29 


17 


1.3 


2 


57 


240 


38 


28 


14 


1.0 


3 


36 


114 


11 


27 


16 


1.2 


4 


28 


54 


4.2 


24 


17 


1.1 


5 


27 


44 


3.2 


24 


19 


1.3 


6 


88 


69 


24 


22 


20 


1.2 


7 


513 


330 


460 


33 


98 


17 


8 


158 


294 


149 


43 


154 


21 


9 


70 


149 


29 


41 


91 


11 


10 


50 


93 


13 


26 


49 


3.5 


11 


42 


68 


7.8 


34 


37 


3.4 


12 


297 


197 


513 


25 


25 


1.7 


13 


1970 


3830 


26800 


24 


22 


1.4 


14 


333 


1060 


1230 


22 


21 


1.3 


IS 


126 


266 


89 


22 


21 


1.2 


16 


8S 


181 


42 


21 


20 


1.1 


17 


141 


307 


134 


26 


29 


2.3 


18 


104 


327 


97 


128 


344 


841 


19 


61 


137 


23 


463 


1240 


2360 


20 


511 


1880 


9360 


281 


648 


571 


21 


295 


718 


737 


128 


422 


158 


22 


237 


574 


530 


77 


142 


29 


23 


94 


207 


54 


175 


746 


535 


24 


66 


106 


19 


83 


300 


73 


25 


54 


66 


9.6 


65 


109 


19 


26 


46 


42 


5.3 


259 


1240 


1430 


27 


48 


31 


4.1 


86 


163 


39 


28 


42 


28 


3.2 


67 


81 


15 


29 


37 


25 


2.5 











30 


33 


22 


1.9 











31 


30 


21 


1.8 











lOTAL 


6220 





42725.6 


2283 





6142.0 



MARCH 



56 


51 


7.7 


SO 


40 


5.4 


45 


32 


4.0 


41 


37 


4.1 


39 


48 


5.0 


37 


65 


6.5 


36 


73 


7.1 


35 


61 


5.7 


34 


50 


4.6 


33 


41 


3.6 


32 


31 


2.7 


31 


35 


2.9 


31 


33 


2.8 


33 


31 


2.8 


30 


22 


1.8 


44 


131 


41 


94 


392 


156 


54 


225 


36 


33 


131 


12 


31 


108 


9.0 


30 


89 


7.2 


29 


83 


6.6 


57 


137 


29 


51 


121 


19 


41 


75 


14 


61 


166 


38 


70 


184 


51 


47 


95 


13 


38 


39 


4.0 


36 


25 


2.5 


49 


79 


25 



1328 



530.0 



196 



SAN LORENZO CREEK BASIN 
11181040 SAN LORENZO CREEK AT SAN LORENZO, CA--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







MEAN 






MEAN 


CONCEN- 


SEDIMENT 




DISCHARGE 


TRATION 


DISCHARGE 


DAY 


<CFS) 


(MG/L) 
APRIL 


(TONS /DAY) 


1 


45 


136 


18 


2 


35 


51 


4.9 


3 


34 


42 


3.9 


4 


39 


44 


5.2 


5 


34 


20 


1.9 


6 


35 


14 


1.4 


7 


36 


13 


1.2 


8 


36 


16 


1.5 


9 


36 


22 


2.1 


10 


33 


31 


2.8 


11 


32 


29 


2.5 


12 


31 


18 


1.5 


13 


31 


21 


1.7 


lA 


31 


27 


2.2 


15 


31 


26 


2.1 


16 


29 


24 


1.9 


17 


48 


111 


18 


18 


36 


129 


18 


19 


25 


54 


3.7 


20 


24 


32 


2.1 


21 


23 


19 


1.2 


22 


22 


16 


.95 


23 


32 


51 


9.3 


24 


30 


48 


4.3 


25 


20 


16 


.90 


26 


18 


8 


.39 


27 


17 


7 


.32 


28 


16 


7 


.28 


29 


15 


5 


.19 


30 


14 


4 


.16 


31 












TOTAL 



888 



114.59 



PERIOD 



13178.93 



53034.68 



SUmARY OF WATER AND SEDIMENT DISCHARGE, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







WATER 


SUSPENDED 


BEDLOAD 


TOTAL 


MONTH 




DISCHARGE 


SEDIMENT 
DISCHARGE 


DISCHARGE 


SEDIMENT 
DISCHARGE 






CFS-DAYS 


TONS 


TONS 


TONS 


OCTOBER 


1992 


327.13 


521.27 


19 


540 


NOVEMBER 


.... 


157.10 


1.73 





2 


DECEMBER 


.... 


1975.70 


2999.49 


165 


3160 


JANUARY 


1993 


6220.00 


42725.60 


464 


43200 


FEBRUARY 




2283.00 


6142.00 


97 


6240 


MARCH . . . 




1328.00 


530.00 


5 


535 


APRIL . . . 


.... 


888.00 


114.59 


1 


116 


PERIOD . . 




13178.93 


53034.68 


751 


53793 



TEMESCAL CREEK BASIN 
11181330 TEMESCAL CREEK ABOVE LAKE TEMESCAL, AT OAKLAND. CA 



197 



LOCATION.— Lat 37'50'38", long 122'13'35. in San Antonio (V and D Peralta) Grant. Alameda County. Hydrologie Unit 
18050002. on right bank at Oakland, 0.1 mi upstream of inflow to Lake Temescal. 

DRAINAGE AREA.— 1.74 mi 2. 

PERIOD OF RECORD. — October 1979 to September 1981. June 1989 to September 1993 (discontinued). 
CHEMICAL DATA: Water years 1979-80. 
SEDIMENT DATA: Water years 1979-81. 

GAGE. — Water-stage recorder. Elevation of gage is 395 ft above sea level, from topographic map. 

REMARKS. --Records fair. No diversion or regulation upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 156 ft'/s, Jan. 20, 1993, gage height, 4.70 ft; no flow 
Sept. 30, 1990, and several days in 1991 and 1992. 

EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 75 ft^/s and maximum (*): 



Date 

Oct. 29 

Dec . 28 

Jan. 1 

Jan. 7 



Time 

1100 
0730 
0445 
0015 



Discharge 
(ft^/s) 



96 
98 

116 
124 



Gage height 
(ft) 

3.49 
3.S4 
3.91 
4.07 



Date 

Jan. 13 
Jan. 20 
Feb. 19 



Time 

044S 
1645 
0415 



Discharge 
(ft^/s) 



129 

*156 

112 



Gage height 
(ft) 

4.17 

*4.70 

3.83 



Minimum dally, 0.02 ff'/s. Sept. 25, 26, and 29. 



DAY 



OCT 



DISCHARGE, 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.23 


.71 


e.20 


16 


1.3 


.88 


1.5 


.53 


.23 


.11 


.09 


.06 


2 


.26 


.11 


el.O 


1.8 


1.2 


.81 


.69 


.48 


.27 


.12 


.07 


.08 


3 


.24 


.09 


e.40 


1.2 


1.2 


.76 


.60 


.84 


.64 


.13 


.09 


.05 


4 


.22 


.10 


e.30 


.92 


1.0 


.62 


.61 


.31 


.22 


.13 


.09 


.04 


5 


.21 


.09 


e.20 


.79 


.81 


.57 


.55 


.34 


.21 


.11 


.07 


.04 


6 


.21 


.08 


e4.0 


8.1 


.47 


.57 


.52 


.28 


.20 


.11 


.07 


.04 


7 


.19 


.09 


e3.0 


17 


3.1 


.57 


.47 


.29 


.20 


.11 


.08 


.05 


B 


.19 


.08 


e7.0 


3.5 


1.3 


.53 


.48 


.32 


.20 


.11 


.08 


.06 


9 


.23 


.08 


el5 


1.9 


1.3 


.48 


.43 


.37 


e.l9 


.12 


.08 


.05 


10 


.22 


.09 


4.8 


1.5 


.74 


.48 


1.2 


.32 


e.l9 


.12 


.08 


.04 


11 


.19 


.08 


4.5 


1.1 


.60 


.48 


.43 


.32 


e.lS 


.12 


.07 


.05 


12 


.18 


.07 


.51 


8.8 


.44 


.44 


.34 


.31 


.18 


.13 


.07 


.05 


13 


.16 


.08 


.24 


47 


.43 


.44 


.32 


.29 


.18 


.14 


.09 


.05 


14 


.16 


.09 


.19 


11 


.39 


.44 


.29 


.30 


.16 


.14 


.09 


.05 


15 


.16 


.09 


.13 


6.6 


.39 


.45 


.29 


.32 


.17 


.13 


.08 


.06 


16 


.16 


.10 


.09 


3.4 


.38 


3.0 


.26 


.30 


.22 


.14 


.08 


.05 


17 


.16 


.09 


2.4 


7.1 


1.3 


5.0 


2.4 


.30 


.22 


.14 


.14 


.05 


18 


.16 


.08 


.14 


3.9 


4.7 


1.4 


1.9 


.36 


.20 


.12 


.06 


.05 


19 


.16 


.32 


.10 


2.5 


13 


.82 


.70 


.36 


.16 


.11 


.06 


.05 


20 


1.9 


.10 


.08 


32 


3.1 


.74 


.61 


.33 


.16 


.11 


.06 


.05 


21 


.34 


.10 


.07 


13 


2.0 


.72 


.57 


.21 


.14 


.12 


.05 


.05 


22 


.13 


.17 


.06 


5.4 


3.1 


.69 


.53 


.19 


.13 


.10 


.05 


.04 


23 


.13 


.17 


.12 


2.4 


5.9 


3.0 


1.4 


1.4 


.14 


.11 


.05 


.03 


24 


.11 


.20 


.17 


1.5 


2.0 


1.5 


1.3 


.27 


.14 


.14 


.07 


.03 


2S 


.11 


.20 


.16 


1.1 


1.9 


1.3 


.61 


1.5 


.14 


.10 


.05 


.02 


26 


.15 


.20 


.16 


.90 


1.8 


1.1 


.55 


.52 


.12 


.11 


.04 


.02 


27 


.13 


.21 


.15 


.78 


1.2 


3.1 


.53 


.23 


.10 


.11 


.06 


.03 


28 


.15 


.17 


10 


.83 


.97 


1.0 


.48 


.23 


.10 


.12 


.05 


.03 


29 


15 


.17 


4.0 


.75 





.72 


.48 


.67 


.10 


.10 


.04 


.02 


30 


.28 


.20 


1.2 


1.0 





.68 


.53 


.27 


.10 


.10 


.05 


.03 


31 


.12 





.72 


1.1 





3.0 





.24 





.09 


.05 





TOTAL 


22.24 


4.41 


61.09 


204.87 


56.02 


36.29 


21.57 


13.00 


5.59 


3.65 


2.16 


1.32 


MEAN 


.72 


.15 


1.97 


6.61 


2.00 


1.17 


.72 


.42 


.19 


.12 


.070 


.044 


MAX 


15 


.71 


15 


47 


13 


5.0 


2.4 


1.5 


.64 


.14 


.14 


.08 


MIN 


.11 


.07 


.06 


.75 


.38 


.44 


.26 


.19 


.10 


.09 


.04 


.02 


AC-FT 


44 


8.7 


121 


406 


111 


72 


43 


26 


11 


7.2 


4.3 


2.6 


e Estimated. 

























198 



TEMESCAL CREEK BASIN 
11181330 TEMESCAL CREEK ABOVE LAKE TEMESCAL. AT OAKLAND. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1980 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR AFR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.54 


.34 


.91 


2. IS 


2.22 


1.48 


.40 


.33 


.15 


.10 


.095 


.094 


MAX 


1.26 


.74 


1.97 


6.61 


4.57 


2.76 


.76 


.80 


.25 


.20 


.20 


.22 


(WY) 


1992 


1990 


1993 


1993 


1980 


1991 


1980 


1990 


1980 


1980 


1992 


1992 


MIN 


.08A 


.14 


.18 


.11 


.35 


.37 


.18 


.11 


.057 


.025 


.019 


.014 


(WY) 


1991 


1991 


1990 


1991 


1981 


1990 


1990 


1991 


1989 


1989 


1991 


1991 



SU»4ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1980 



1993 



325.70 






.89 






22 


Feb 


14 


.05 


Feb 


4 


.08 


Feb 


2 


646 






1.4 






.19 






.11 







432, 


,21 






1, 


,18 






47 




Jan 


13 




,02 


Sep 


25 




,03 


Sep 


23 


156 




Jan 


20 


4. 


,70 


Jan 


20 


857 








2, 


,4 

,22 

,06 







.73 








1.18 






1993 


.39 






1991 


47 


Jan 


13 


1993 


.00 


Sep 


30 


1990 


.00 


Oct 


10 


1991 


156 


Jan 


20 


1993 


4.70 


Jan 


20 


1993 


530 








.98 








.15 








.02 









SAN FRANCISCO BAY 
11181360 SAN PABLO STRAIT AT POINT SAN PABLO, CA 



199 



LOCATION. --Lat 37'57'53", long 122"25'42", in NW l/t, sec. 3, T.l N., R.5 W. , Contra Costa County, Hydrologic Unit 
18050002, on north end of Port of Richmond Pier on west side of Point San Pablo. 

GAGE-HEIGHT RECORDS 

DRAINAGE AREA. — Indeterminate. 

PERIOD OF RECORD. — October 1989 to current year (gage height only). 

GAGE. --Water-stage recorder. Datum of gage is 10.00 ft below sea level. 

REMARKS. --Daily maximums and miniraums sometimes differ from tidal-cycle (24.8 hours) maximums and minimums. 

EXTREMES FOR PERIOD OF RECORD. --Maximum gage height recorded, 15.27 ft, Jan. 7, 1993; minimum gage height 
recorded, 5.11 ft, Dec. 30, 1990. 

EXTREMES FOR CURRENT YEAR. --Maximum gage height recorded. 15.27 ft, Jan. 7; minimvim gage height recorded, 
5.66 ft. May 7. 



DAY 



GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


13.64 


7.59 


12.31 


7.73 


12.37 


8.35 


13.52 


9.15 


13.29 


8.08 


12.91 


8.38 


2 


13.34 


7.76 


12.22 


7.81 


13.10 


8.74 


13.25 


8.23 


13.67 


6.92 


12.82 


8.09 


3 


12.88 


7.86 


12.44 


7.93 


13.18 


9.24 


13.34 


7.54 


14.27 


7.07 


13.15 


7.39 


4 


12.80 


7.92 


12.66 


8.18 


13.41 


8.73 


13.67 


7.17 


14.68 


7.06 


13.18 


6.79 


5 


12.70 


8.02 


13.05 


8.64 


13.67 


8.06 


14.20 


6.98 


15.02 


6.75 


13.36 


5.97 


6 


12.71 


8.08 


13.21 


8.10 


14.32 


8.55 


14.70 


7.09 


14.84 


6.76 


13.67 


6.04 


7 


12.76 


8.26 


13.29 


7.65 


14.54 


7.43 


15.27 


7.13 


14.98 


7.47 


13.82 


6.98 


8 


13.01 


8.46 


13.56 


7.23 


14.45 


7.02 


15.16 


6.67 


14.95 


7.96 


13.68 


7.34 


9 


13.27 


8.55 


13.75 


6.85 


14.48 


6.54 


14.86 


6.68 


14.46 


7.98 


13.94 


7.55 


10 


13.44 


8.12 


13.65 


6.50 


14.85 


6.54 


14.59 


6.87 


14.07 


8.30 


14.07 


7.25 


11 


13.51 


7.81 


13.80 


6.41 


14.68 


6.34 


13.77 


6.92 


14.31 


8.13 


14.05 


7.10 


12 


13.64 


7.63 


13.86 


6.47 


13.84 


6.03 


13.49 


8.17 


14.07 


7.86 


13.98 


7.02 


13 


13.85 


7.60 


13.85 


6.78 


13.38 


6.36 


14.91 


9.35 


13.80 


7.80 


13.83 


7.30 


14 


13.87 


7.40 


13.68 


6.94 


13.04 


7.00 


14.75 


9.05 


13.73 


7.76 


13.67 


7.51 


15 


13.70 


7.29 


13.39 


7.27 


12.97 


7.46 


14.43 


8.46 


13.77 


7.78 


13.27 


7.53 


16 


13.52 


7.34 


12.95 


7.53 


13.18 


8.14 


14.56 


8.20 


13.85 


6.80 


13.03 


7.80 


17 


13.31 


7.49 


12.90 


7.79 


13.68 


8.39 


14.78 


7.24 


14.09 


7.51 


13.52 


8.07 


18 


13.08 


7.48 


13.09 


7.79 


13.55 


7.45 


14.82 


7.04 


14.60 


7.94 


13.20 


7.84 


19 


12.93 


7.53 


13.32 


7.99 


13.76 


6.90 


14.41 


6.49 


15.07 


8.78 


13.05 


7.86 


20 


13.10 


7.55 


13.42 


7.28 


14.03 


6.51 


14.87 


7.16 


14.29 


7.89 


12.84 


7.92 


21 


13.18 


7.95 


13.90 


6.83 


13.99 


6.17 


14.36 


6.56 


13.66 


7.38 


13.00 


8.40 


22 


13.30 


7.80 


14.36 


6.64 


13.84 


5.89 


13.95 


6.30 


13.48 


8.44 


13.23 


8.53 


23 


13.67 


7.51 


14.39 


6.47 


13.72 


5.83 


13.75 


7.15 


13.81 


9.12 


13.43 


8.48 


24 


14.18 


7.20 


14.41 


6.37 


13.71 


6.12 


13.37 


7.54 


13.33 


9.13 


13.49 


8.30 


25 


14.38 


6.78 


14.20 


6.32 


13.69 


6.45 


13.03 


8.03 


13.23 


9.02 


13.58 


8.32 


26 


14.40 


6.70 


13.70 


6.26 


13.44 


6.79 


12.97 


8.52 


13.18 


8.92 


13.76 


8.28 


27 


14.46 


6.82 


13.39 


6.57 


13.33 


7.55 


13.17 


9.13 


13.24 


8.84 


13.51 


8.20 


28 


14.33 


7.08 


13.12 


7.04 


13.57 


8.60 


13.16 


9.43 


13.09 


8.80 


13.44 


8.20 


29 


14.30 


7.53 


12,49 


7.30 


13.56 


8.63 


12.97 


9.45 








13.06 


8.20 


30 


13.68 


7.54 


12.21 


7.74 


13.01 


8.63 


12.90 


9.25 








12.86 


8.23 


31 


12.97 


7.58 








13.07 


9.46 


13.30 


8.83 








12.80 


8.19 



MONTH 14.46 



6.70 



14.41 



6.26 



14.85 



5.83 



15.27 



6.30 



15.07 



6.75 



14.07 



5.97 



200 



SAH FRAMCISCO BAY 



11181360 SAN PABLO STRAIT AT POINT SAN PABLO, CA--Continued 
GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



lAY 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 




APRIL 




MAY 




JUNE 




JULY 


AUGUST 


SEPTEMBER 


1 


12.81 


7.84 


13.33 


7.87 


14.29 


7.14 


14.38 


6.59 


14.02 


6.82 


13.47 


8.13 


2 


12.77 


7.50 


13.81 


8.21 


14.41 


6.69 


14.37 


6.41 


13.94 


7.13 


13.24 


8.41 


3 


13.16 


7.49 


14.07 


7.62 


14.43 


6.34 


14.35 


6.44 


13.94 


7.41 


13.22 


8.58 


4 


13.51 


7.51 


14.21 


6.84 


14.53 


6.29 


14.28 


6.61 


13.62 


7.71 


13.20 


8.64 


5 


13.86 


7.58 


14.33 


6.32 


14.52 


6.34 


14.24 


6.94 


13.19 


7.93 


13.41 


8.69 


6 


14.10 


6.96 


14.20 


6.00 


14.29 


6.43 


13.91 


7.10 


13.03 


8.27 


13.29 


8.49 


7 


14.10 


6.40 


14.10 


5.66 


13.69 


6.53 


13.51 


7.47 


13.12 


8.75 


13.14 


8.42 


8 


14.24 


6.29 


13.96 


5.74 


13.24 


6.49 


13.15 


8.08 


13.15 


9.02 


13.22 


8.46 


9 


14.11 


6.26 


13.72 


6.13 


12.68 


7.28 


13.28 


8.52 


13.14 


8.79 


13.35 


8.40 


10 


13.80 


6.31 


13.49 


6.77 


12.64 


7.89 


13.29 


8.95 


13.03 


8.47 


13.33 


8.11 


11 


13.24 


6.42 


13.12 


7.34 


12.62 


8.37 


13.43 


9.32 


13.27 


8.39 


13.47 


7.79 


12 


12.75 


7.07 


12.82 


7.62 


12.86 


8.97 


13.62 


9.27 


13.50 


7.94 


13.86 


7.53 


13 


12.34 


7.58 


12.79 


8.06 


13.17 


9.07 


13.75 


8.88 


13.80 


7.69 


13.86 


7.49 


14 


12.13 


7.85 


12.81 


8.55 


13.06 


8.60 


13.82 


8.24 


14.11 


7.29 


13.75 


7.44 


15 


12.41 


7.99 


12.95 


8.91 


13.47 


8.05 


13.83 


7.67 


14.12 


6.98 


13.69 


7.42 


16 


12.60 


8.12 


13.13 


8.68 


13.89 


7.70 


13.99 


7.17 


14.11 


6.73 


13.79 


7.65 


17 


12.89 


8.44 


13.46 


8.13 


14.17 


6.78 


14.12 


6.64 


14.00 


6.76 


13.92 


7.22 


18 


12.77 


8.31 


13.64 


7.76 


14.30 


6.68 


14.25 


6.58 


14.00 


6.89 


14.08 


7.22 


19 


13.14 


7.82 


13.77 


7.52 


14.36 


6.00 


14.15 


6.58 


13.72 


7.25 


14.17 


7.31 


20 


13.27 


7.62 


13.92 


7.22 


14.29 


6.69 


14.15 


6.54 


13.60 


7.52 


14.08 


7.45 


21 


13.33 


7.28 


13.93 


6.62 


14.29 


6.48 


13.96 


6.67 


13.80 


7.92 


13.84 


7.63 


22 


13.37 


6.94 


14.12 


6.67 


13.80 


6.22 


13.49 


6.88 


14.03 


7.86 


13.61 


7.72 


23 


13.45 


6.77 


14.13 


6.69 


13.38 


6.37 


13.49 


7.36 


14.02 


7.81 


13.21 


7.70 


24 


13.63 


6.82 


13.98 


6.79 


13.07 


6.98 


13.87 


8.09 


14.01 


7.85 


13.01 


7.65 


25 


13.37 


6.66 


13.84 


6.31 


13.48 


7.62 


14.00 


8.22 


13.93 


7.75 


13.02 


7.69 


26 


13.11 


6.62 


13.86 


6.78 


13.77 


8.31 


14.08 


8.23 


13.80 


7.18 


12.88 


7.76 


27 


12.83 


6.94 


13.37 


7.30 


13.98 


8,58 


14.19 


7.94 


13.83 


7.09 


12.81 


7.80 


28 


12.63 


7.15 


13.30 


7.96 


14.07 


8.13 


14.20 


7.50 


13.85 


7.40 


12.89 


8.07 


29 


12.30 


7.34 


13.48 


8.23 


14.18 


7,36 


14.06 


7.13 


13.87 


7.63 


13.22 


8.46 


30 


12.83 


7.55 


13.94 


8.57 


14.23 


6.92 


14.06 


6.84 


13.79 


7.74 


13.10 


8.07 


31 








14.16 


8.07 








14.06 


6.71 


13.48 


7.91 









MONTH 14.24 



6.26 



14.33 



5.66 



14.53 



6.00 



14.38 



6.41 



14.12 



6.73 



14.17 



7.22 



SAN FRANCISCO BAY 201 

11181360 SAN PABLO STRAIT AT POINT SAN PABLO, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: October 1989 to current year. 
WATER TEMPERATURE: October 1989 to current year. 

INSTRUMENTATION. --Water-quality monitor since October 1989. 

REMARKS. --Interruptions in record were due to malfunction of the sensing and/or recording instruments. Upper probe 
is set at 3.6 ft below Mean Lower Low Water (MLLW). Lower probe is set at EA . 8 ft below MLLW. Daily maximums 
and minimuras sometimes differ from tidal-cycle (2«.8 hours) maximums and minimuras. 

EXTREMES FOR PERIOD OF RECORD. -- 

SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 50,900 microsiemens, Aug. 25, 28, 1992; minimum recorded, 
5,130 microsiemens. Mar. 30, 1993. 

(Lower probe) Maximum recorded, 50,100 microsiemens, July 23, 1990; minimum recorded 3,0A0 microsiemens, 
March 30, 1993. 
WATER TEMPERATURE: (Upper probe) Maximum recorded, 2'i.0°C, July 31, 1993; minimum recorded, A.S'C, Dec. 23, 1990. 
(Lower probe) Maximum recorded, 22.0"C, July 18-19, 1992, July 31, 1993 and Aug. 1, 16, 1993; minimum recorded 
5.0'C, Dec. 21, 23, 1990. 

EXTREMES FOR CURRENT YEAR.-- 

SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 49,900 microsiemens, Oct. 28; minimum recorded, 
5,130 microsiemens, March 30. 

(Lower probe) Maximum recorded, 46,900 microsiemens, July 28; minimum recorded, 3,040 microsiemens, March 30. 
WATER TEMPERATURE; (Upper probe) Maximum recorded, 24.0*C, July 31; minimum recorded, 6.5'C, Jan. 12. 
(Lower probe) Maximum recorded, 22.0°C, July 31, Aug. 1, 16; minimum recorded, 6.5'C, Jan. 12. 

SPECIFIC CONDUCTANCE, US/CM @ 25 DEGREES CELSIUS, WATER YEAR CXTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



DAY 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 


MAX 


MIN 




OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


47300 


41800 


48800 


42100 


48100 


40300 


45800 


35400 


40800 


19600 


38300 


8870 


2 


46700 


42700 


48700 


40800 


48100 


40400 


47100 


34800 


45400 


19300 


38300 


11800 


3 


46900 


41400 


48700 


41100 


47900 


41100 


46900 


33300 


42200 


24300 


40400 


13800 


4 


46300 


39700 


49000 


39800 


47700 


41400 


46300 


33400 


42200 


18800 


38300 


17700 


5 


46300 


39400 


49000 


40800 


48100 


41000 


46900 


32700 


43300 


25300 


37100 


19000 


6 


45800 


39300 


48800 


42000 


48400 


41300 


47300 


33300 


43400 


25100 


39600 


19400 


7 


46300 


39700 


48900 


42000 


48400 


40700 


47400 


33400 


43400 


26500 


40700 


20300 


8 


46800 


40600 


49000 


42300 


48500 


41200 


46800 


33300 


43100 


28400 


39900 


22800 


9 


47100 


41900 


49400 


42500 


48600 


40700 


46500 


31900 


42300 


27500 


40300 


23200 


10 


47200 


41600 


49400 


42900 


48500 


39700 


46200 


31200 


41200 


25700 


40200 


22300 


11 


47500 


40900 


49300 


41800 


48000 


40500 


44400 


27100 


41800 


23900 


40800 


23300 


12 


47700 


41200 


49500 


42200 


47700 


39000 


44400 


24600 


41700 


21700 


40800 


22500 


13 


48000 


41300 


49400 


41900 


47600 


35000 


44900 


24700 


42200 


17400 


40500 


20100 


14 


48000 


41700 


49200 


41800 


46200 


33500 


43400 


25300 


42700 


18200 


38900 


19500 


15 


48200 


41900 


49000 


41800 


46200 


35000 


43400 


21500 


41400 


17600 


39400 


19800 


16 


48300 


42200 


48600 


41800 


46100 


32800 


43400 


20300 


40200 


20800 


38100 


19400 


17 


48300 


41800 


47800 


41500 


46300 


31100 


43400 


19200 


39400 


21000 


39500 


17300 


18 


48000 


41700 


47900 


43300 


46300 


35400 


38900 


18100 


42100 


22100 


39500 


21200 


19 


47900 


42300 


47900 


42100 


46500 


34700 


38000 


15900 


40600 


22800 


39500 


20200 


20 


48400 


42000 


48100 


42800 


46400 


33200 


38200 


12500 


37800 


18600 


40000 


20100 


21 


48500 


42500 


48500 


41400 


47000 


34300 


39000 


9210 


38200 


10500 


39400 


18700 


22 


48500 


44500 


49100 


41300 


46400 


34800 


35900 


11100 


38500 


11600 


40300 


16600 


23 


48600 


42700 


49100 


43100 


46700 


34500 


34200 


10100 


38100 


12000 


38500 


19400 


24 


49000 


43000 


49100 


43500 


46900 


34000 


34700 


9340 


36300 


8500 


41400 


17300 


25 


49300 


44400 


49000 


42400 


46700 


34500 


35300 


7950 


31000 


11400 


38400 


15300 


26 


49500 


44100 


49000 


41200 


46700 


34700 


35400 


10400 


34600 


8780 


35000 


15200 


27 


49700 


43500 


48900 


41700 


46900 


35900 


36300 


11000 


34400 


10800 


36300 


9810 


28 


49900 


44300 


48900 


42500 


46300 


37400 


37400 


14600 


35800 


9200 


35000 


11900 


29 


49400 


43200 


48400 


40500 


46700 


37700 


37800 


14800 








39700 


9010 


30 


49700 


43900 


47800 


39700 


45700 


35700 


38400 


17600 








37600 


5130 


31 


49100 


42600 








46100 


36200 


38600 


17100 








37100 


5630 


MONTH 


49900 


39300 


49500 


39700 


48600 


31100 


47400 


7950 


45400 


8500 


41400 


5130 



202 



SAN FRANCISCO BAY 



11181360 SAN PABLO STRAIT AT POINT SAN PABLO, CA- -Continued 

SPECIFIC CONDUCTANCE, US/CM S 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



39300 
34500 
36700 
38'i00 
37500 



8360 
11200 
10800 
12100 
13200 



*3100 
<i3A00 
1,1,500 
43800 
44600 



26700 
26000 
28500 
29800 
28100 



43200 
43500 
43100 
43300 
42900 



27300 
28200 
27300 
24700 
23900 



44500 
44100 
44500 
45200 
45100 



29500 
29200 
29900 
30300 
31100 



47400 
47600 
47200 
46800 
46700 



34800 
34900 
34600 
35500 
34000 



45700 
45800 
45500 
45500 
45500 



35000 
33900 
31600 
32700 
34400 



6 

7 

8 

9 

10 



37700 
38700 
39200 
39500 
39300 



13000 
13800 
14900 
13500 
13000 



44600 
44500 
44500 
43000 
41800 



27500 
28400 
27600 
24300 
23300 



43100 
40900 
39300 
40600 
38200 



23000 
19200 
15400 
11900 
16200 



44900 
45300 
45600 
45700 
46200 



31600 
32400 
31100 
30800 
32300 



46500 33100 

46500 33200 

46200 31100 

46500 31400 

45000 29300 



45300 
44000 
44300 
44000 
44900 



33300 
33200 
32700 
30600 
34100 



11 
12 
13 
14 
15 



40400 
38100 
38900 
40700 
41500 



12300 
14600 
11700 
14400 
18200 



42500 
41300 
42100 
41000 
41000 



23900 
21700 
21100 
24600 
22400 



39300 
40900 
39600 
39700 
41200 



16100 
15400 
19100 
21000 
23100 



45600 
46200 
46100 
43600 
45600 



34000 
33200 
32500 
32800 
33100 



44500 33400 
45800 31900 
46400 33700 



44700 
45400 
45400 
44900 
45800 



35200 
34800 
34300 
34700 
34900 



16 
17 
18 
19 
20 



39600 
41500 
41500 
42000 
41600 



19900 
21600 
23100 
25100 
21900 



41800 
41800 
43100 
43200 
43200 



24500 
24300 
27800 
28900 
29400 



41700 
43700 
43000 
43500 
43900 



22200 
24300 
26700 
27300 
27700 



46800 
47300 
47300 
48000 
47800 



32800 
33200 
33000 
33100 
34200 



47000 
46300 
46200 



33200 
32900 
35300 



45900 
46000 
46200 



36000 
35700 
34500 



21 
22 
23 
24 
25 



41600 
41800 
42600 
41500 
40500 



25800 
25900 
24500 
24200 
21600 



43400 
42700 
43900 
41700 
43400 



29300 
30800 
29500 
29200 
28000 



42600 
43000 
41500 
42500 
42900 



27000 
27400 
24500 
24200 
22200 



47300 

47000 
46900 
47600 
48100 



33600 
34400 
33300 
36100 
33300 



46200 
46400 
46500 
46100 
45900 



32800 
33300 
34600 
34100 
34500 



46500 
46200 
45500 
45400 
45400 



36100 
36700 
37200 
35700 
34400 



26 
27 
28 
29 
30 
31 



40400 
40700 
41500 
40900 
42300 



21600 
21000 
18700 
21300 
23500 



42300 
42300 
43000 
43000 
43500 
43200 



25600 
24200 
22700 
22900 
23900 
25400 



41800 
43800 
44000 
44100 
44400 



27400 
27100 
28800 
29100 
29000 



48400 
48700 
48800 
48400 
47800 
47400 



36200 
37000 
36900 
37200 
35700 
34800 



45300 
45600 
46500 
46200 
46200 
46200 



33700 
34100 
34000 
34700 
36400 
35900 



44700 
44600 
45600 
45500 
45500 



34700 
35900 
35400 
37400 
37200 



MONTH 42600 



8360 



44600 21100 



44400 11900 



48800 29200 



SAN FRANCISCO BAY 



203 



11181360 POINT SAN PABLO STRAIT AT POINT SAN PABLO, CA--Contlnued 

SPECIFIC CONDUCTANCE, US/CM 6 25 DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(LOWER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIH 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


43200 


39600 


45000 


39900 


45000 


40100 


42800 


35000 


44800 


18100 


41200 


10700 


2 


43100 


40200 


44800 


38400 


45100 


40100 


43600 


34200 


45000 


19200 


42300 


11500 


3 


43300 


39400 


44700 


40000 


44900 


39500 


43300 


32200 


43500 


22200 


42100 


11300 


A 


43100 


38600 


45000 


38400 


45000 


39600 


42700 


31700 


41600 


20300 


40100 


16300 


5 


43100 


38600 


45100 


39500 


44900 


39000 


42800 


30600 


42500 


23400 


40400 


17800 


6 


43000 


38500 


45100 


40100 


45200 


39400 


42600 


31200 


42300 


23200 


39900 


18300 


7 


43000 


38400 


45200 


40400 


45000 


38500 


42600 


30900 


42300 


24200 


40600 


19200 


8 


43400 


40100 


45400 


41000 


45200 


39200 


41700 


30700 


42200 


26100 


40100 


21500 


9 


43700 


41000 


45500 


40200 


45300 


38300 


41300 


29600 


41100 


24900 


40700 


22500 


10 


43800 


41300 


45700 


40000 


45700 


39400 


40900 


28900 


40200 


24500 


40700 


22200 


11 


44100 


40700 


45500 


39600 


45100 


38500 


39100 


26000 


40400 


20800 


41500 


23500 


12 


44300 


40500 


45600 


39800 


45000 


37100 


38800 


23700 


40300 


19800 


41500 


21700 


13 


44600 


40600 


45600 


39600 


44700 


34300 


39000 


24000 


40800 


15400 


41600 


19400 


14 


44700 


40600 


45600 


39800 


43800 


33600 


38400 


23600 


41900 


15200 


42000 


18400 


15 


44800 


40600 


45500 


39700 


43500 


34700 


42700 


19900 


41200 


17100 


41100 


18500 


16 


45000 


40900 


45200 


40100 


43400 


33800 


42800 


18400 


41200 


18400 


42300 


19000 


17 


45200 


40500 


44800 


40500 


43700 


33700 


43600 


14500 


40500 


17700 


41400 


16100 


18 


45200 


40600 


44700 


41200 


43600 


35300 


43100 


16900 


40700 


19300 


40500 


20800 


19 


45300 


41100 


44800 


41000 


43700 


34900 


40800 


14500 


39800 


19800 


40700 


18900 


20 


45600 


41400 


45100 


40000 


43800 


32800 


37400 


9900 


38700 


15300 


40400 


19200 


21 


45500 


42100 


45200 


39900 


44300 


33800 


40300 


6900 


37000 


6210 


40100 


21200 


22 


45600 


43100 


45600 


39700 


44100 


34300 


39700 


8420 


36500 


7980 


40500 


16000 


23 


45500 


42600 


45500 


40700 


44100 


34000 


38000 


7370 


36300 


9020 


41300 


20200 


24 


45700 


41900 


45500 


39500 


44100 


33200 


38300 


6630 


36000 


4320 


41400 


16600 


25 


45700 


42500 


45400 


40100 


44000 


33400 


38200 


4770 


36400 


8260 


41200 


13500 


26 


45900 


42300 


45500 


39500 


43700 


33400 


37900 


10000 


37800 


5030 


41900 


14000 


27 


46000 


42400 


45500 


40200 


44000 


33900 


38300 


12200 


39700 


9170 


40200 


7630 


28 


45900 


42000 


45600 


40400 


43400 


35600 


39400 


14400 


40300 


7470 


39800 


9520 


29 


45400 


40700 


45400 


38700 


43700 


36100 


40700 


14000 








41200 


7410 


30 


45400 


41500 


44900 


38100 


42800 


34700 


43100 


17500 








40700 


3040 


31 


45100 


39900 








43100 


36900 


43900 


17900 








41500 


6740 



MONTH 46000 38400 



45700 38100 



45700 32800 



43900 



4770 



45000 



4320 



42300 



3040 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 


41900 


7100 


42500 


26000 


43600 


26500 


44300 


28300 


46300 


32500 


44900 


33500 


2 


39700 


11500 


42300 


27000 


43800 


27400 


44200 


28000 


46300 


32400 


44800 


32100 


3 


40400 


11600 


43100 


28400 


43600 


26100 


44200 


28700 


45800 


32200 


44500 


29900 


4 


39300 


12000 


42600 


29300 


43500 


23100 


44500 


29000 


45700 


32800 


44200 


33000 


5 


38400 


14800 


43000 


25600 


43200 


22000 


44600 


29800 


45300 


32600 


44300 


33400 


6 


38700 


11800 


43300 


25200 


43200 


21600 


44000 


30500 


45100 


32100 


44300 


31200 


7 


40100 


13500 


43800 


27500 


42600 


18700 


43500 


29700 


45200 


33900 


43400 


32800 


8 


40700 


14100 


44200 


25800 


42000 


12600 


43500 


31200 


45300 


31500 


43800 


34800 


9 


41300 


13100 


44500 


24300 


40500 


9360 


43900 


30100 


45100 


31500 


44100 


30000 


10 


40900 


12700 


45300 


23100 


41800 


14100 


44400 


32000 


45200 


29600 


43800 


32900 


11 


42100 


13100 


44400 


25400 


42300 


16300 


44300 


31700 


45300 


32900 


44000 


33200 


12 


43400 


14500 


42900 


21700 


43100 


19400 


44500 


31200 


45300 


29300 


44800 


32900 


13 


44500 


13200 


43600 


21100 


42600 


18800 


44800 


30500 


45000 


31500 


44600 


32600 


14 


44700 


16400 


45700 


26200 


44200 


20500 


45400 


30000 







44300 


33000 


15 


45200 


18400 


45700 


21400 


43000 


23300 


44200 


30300 








44600 


34700 


16 


44800 


22700 


44800 


27100 


43300 


22300 


45400 


30000 








44700 


34000 


17 


44500 


21500 


43700 


26800 


43600 


22200 


45600 


30200 








44700 


33900 


18 


42500 


24600 


44000 


27300 


42900 


25000 


45600 


30200 


45600 


30700 


45000 


32800 


19 


42600 


25200 


43900 


28800 


43000 


25400 


46100 


30100 


45000 


30700 








20 


42300 


23100 


44100 


29200 


43100 


25900 


45900 


31700 


44800 


33600 








21 


42200 


24900 


44500 


29300 


42800 


25100 


45600 


30700 


45000 


30400 


44800 


33700 


22 


42300 


25700 


44300 


30400 


42200 


26000 


45500 


31700 


45300 


31300 


44500 


33700 


23 


43000 


23300 


44800 


29100 


42400 


24300 


45100 


31700 


45300 


32600 


44000 


34400 


24 


43300 


23500 


44800 


28800 


42200 


22500 


45800 


33300 


45200 


31500 


44200 


33000 


25 


43300 


20200 


44800 


27400 


42600 


22600 


46300 


33800 


45300 


32400 


44300 


31900 


26 


43200 


20300 


44100 


25300 


42900 


26000 


46500 


33200 


45400 


31700 


43700 


32200 


27 


43600 


20600 


42800 


23000 


43300 


27500 


45800 


34600 


44800 


32000 


44000 


33800 


28 


42500 


20500 


43500 


21700 


43400 


27600 


46900 


34200 


45400 


32100 


44400 


33500 


29 


43100 


20000 


43300 


25100 


43800 


27400 


46700 


34500 


45200 


32500 


44600 


35300 


30 


42700 


22000 


43900 


24100 


44200 


27700 


46300 


33000 


45200 


34400 


44900 


35500 


31 








43500 


24500 








46200 


32200 


45400 


34700 








MONTH 


45200 


7100 


45700 


21100 


44200 


9360 


46900 


28000 















204 



DAY 



SAN FRANCISCO BAY 

11181360 POINT SAN PABLO STRAIT AT POINT SAN PABLO, CA--Continued 

WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(UPPER PROBE) 



MAX 



HIR 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


19. S 


17.5 


18.0 


16.5 


13.5 


12.5 


10.0 


9.0 


11.0 


10.0 


12.0 


10.5 


2 


19. S 


18.0 


18.0 


16.5 


13.5 


12.5 


10.5 


8.5 


11.5 


10.0 


12.5 


11.0 


3 


19. S 


17.5 


18.0 


17.0 


13.0 


12.5 


10.5 


8.0 


11.5 


10.0 


13.5 


11.5 


4 


20. S 


18.0 


18.0 


16.5 


13.0 


12.0 


10.0 


8.0 


11.5 


10.5 


14.0 


11.5 


S 


19. S 


18.0 


18.0 


16.5 


13.0 


12.0 


10.0 


7.5 


12.0 


10.5 


14.5 


12.0 


6 


20.5 


18.0 


18.0 


16.5 


13.0 


12.0 


10.0 


7.5 


12.0 


10.5 


15.0 


12.5 


7 


20.5 


18.0 


18.0 


16.5 


12.5 


12.0 


10.0 


7.5 


12.0 


11.0 


15.0 


12.5 


8 


20.5 


17.5 


17.0 


16.5 


12.5 


11.5 


10.0 


8.0 


12.0 


11.5 


15.0 


13.0 


9 


20.5 


17.5 


17.0 


15.5 


13.0 


12.5 


10.0 


8.0 


12.0 


11.0 


14.5 


13.0 


10 


20.5 


17.5 


16.5 


15.0 


13.0 


12.0 


10.0 


8.0 


12.0 


11.0 


15.0 


13.5 


11 


20.5 


17.5 


16.5 


14.5 


12.5 


12.0 


9.5 


7.5 


12.0 


11.0 


15.5 


13.5 


12 


20.0 


17.5 


16.0 


14.5 


12.5 


10.5 


9.5 


6.5 


12.0 


10.5 


15.5 


14.0 


13 


19.5 


17.5 


16.0 


14.0 


12.5 


10.0 


9.5 


7.5 


12.0 


11.0 


15.5 


14.0 


14 


19.0 


17.5 


15.5 


14.5 


12.0 


10.5 


9.5 


7.5 


12.0 


11.0 


15.5 


14.0 


IS 


18.5 


17.5 


15.5 


14.5 


12.0 


10.5 


9.5 


7.5 


12.5 


11.5 


15.5 


14.0 


16 


18.5 


17.0 


15.5 


15.0 


12.0 


10.5 


9.5 


7.5 


12.0 


11.5 


16.0 


14.5 


17 


18.5 


17.0 


15.5 


15.0 


12.0 


10.0 


9.5 


8.0 


12.0 


11.5 


15.5 


14.0 


18 


18.5 


17.5 


15.5 


15.0 


12.0 


9.5 


9.5 


8.0 


12.0 


11.5 


16.5 


14.5 


19 


18.5 


17.0 


15.0 


15.0 


11.5 


9.5 


9.5 


8.0 


12.0 


11.5 


16.0 


14.5 


20 


18.5 


17.5 


15.0 


13.5 


11.5 


10.0 


10.0 


8.5 


12.0 


11.0 


17.0 


14.5 


21 


19.0 


17.0 


1A.5 


13.5 


11.5 


10.0 


10.0 


8.5 


12.0 


10.5 


17.0 


14.5 


22 


19.5 


17.5 


14.5 


14.0 


11.5 


10.0 


10.5 


9.0 


12.0 


11.0 


17.5 


14.5 


23 


19.0 


17.0 


14.5 


13.0 


11.5 


9.5 


10.0 


8.5 


12.0 


10.5 


16.0 


15.0 


24 


18.5 


17.0 


U.O 


12.0 


11.5 


9.0 


10.0 


9.0 


12.0 


10.0 


16.5 


14.5 


25 


18.5 


17.0 


14.0 


12.5 


11.0 


8.0 


10.5 


9.0 


11.5 


10.0 


15.5 


14.5 


26 


18.5 


17.0 


14.0 


12.5 


11.0 


8.0 


10.5 


9.0 


11.5 


10.0 


15.5 


14.5 


27 


18.5 


17.0 


14.0 


13.5 


10.5 


8.0 


10.5 


9.0 


11.5 


10.5 


14.5 


14.0 


28 


17.5 


16.5 


14.0 


13.0 


10.5 


8.5 


10.5 


9.0 


12.0 


10.0 


15.0 


13.5 


29 


17.0 


16.5 


13.5 


12.5 


10.5 


8.5 


10.5 


9.0 








15.0 


13.5 


30 


17.0 


16.5 


13.5 


12.0 


10.0 


8.5 


11.0 


9.0 








15.0 


13.5 


31 


17.5 


16.5 








10.0 


8.5 


11.0 


9.5 








14.5 


13.5 



MONTH 20 . 5 



16.5 



18.0 



12.0 



13.5 



8.0 



11.0 



6.5 



12.5 



10.0 



17.5 



10.5 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



HIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 


14.5 


13.0 


18.5 


13.5 


19.5 


16.5 


20.5 


15.0 


22.0 


17.5 


22.0 


17.5 


2 


15.0 


13.5 


18.0 


13.5 


19.5 


16.5 


20.0 


15.5 


22.0 


17.5 


21.5 


18.0 


3 


15.5 


13.5 


17.5 


13.5 


19.0 


15.5 


19.5 


15.5 


21.5 


18.0 


20.5 


18.0 


4 


16.5 


13.5 


17.5 


13.5 


18.0 


16.5 


19.0 


15.0 


21.5 


18.0 


20.5 


18.0 


S 


15.5 


13.5 


17.5 


13.5 


18.0 


16.5 


19.0 


15.0 


21.5 


18.0 


20.0 


18.0 


6 


15.5 


13.5 


17.5 


13.5 


18.5 


16.5 


19.5 


15.5 


21.5 


18.5 


19.5 


18.0 


7 


16.0 


13.5 


17.5 


13.5 


19.5 


16.5 


19.0 


16.0 


21.0 


18.5 


20.5 


18.5 


8 


15.5 


13.5 


17.5 


13.5 


19.5 


16.5 


19.0 


16.0 


21.0 


18.5 


20.5 


18.5 


9 


16.0 


13.5 


18.0 


14.0 


20.0 


16.5 


19.0 


16.0 


20.5 


18.0 


20.5 


18.0 


10 


15.5 


13.5 


18.5 


14.5 


19.5 


17.0 


19.0 


16.0 


20.5 


18.5 


20.0 


18.0 


11 


15.0 


13.5 


17.0 


14.0 


19.5 


16.5 


19.0 


16.0 


20.5 


18.5 


20.0 


18.0 


12 


15.5 


13.5 


17.0 


14.0 


19.5 


15.5 


19.0 


16.0 


21.0 


18.5 


19.5 


17.5 


13 


15.5 


13.5 


17.0 


14.0 


19.5 


15.5 


18.5 


16.5 


20.0 


18.0 


19.5 


17.0 


14 


16.0 


13.0 


18.0 


14.5 


21.0 


15.5 


18.5 


17.0 


20.0 


17.5 


19.0 


17.0 


IS 


16.0 


13.0 


18.5 


14.5 


20.0 


15.0 


20.0 


17.0 


20.5 


17.5 


19.0 


17.0 


16 


16.5 


13.0 


18.0 


14.5 


20.5 


15.0 


19.5 


17.0 


22.0 


17.5 


19.0 


17.0 


17 


15.0 


12.5 


17.5 


14.5 


21.0 


14.5 


21.0 


17.0 


21.5 


17.5 


18.5 


16.5 


18 


17.0 


12.5 


18.5 


14.5 


20.0 


15.0 


20.0 


17.0 


21.0 


17.5 


19.0 


16.5 


19 


16.5 


13.0 


18.0 


14.5 


19.5 


15.0 


20.0 


16.5 


21.5 


18.0 


19.0 


16.5 


20 


16.0 


13.0 


18.5 


14.5 


19.5 


15.0 


20.0 


16.5 


21.0 


18.0 


18.5 


16.5 


21 


16.5 


13.5 


18.5 


15.0 


19.0 


15.5 


20.0 


17.0 


21.5 


18.0 


18.5 


16.5 


22 


16.5 


13.5 


19.0 


15.5 


19.5 


15.0 


21.0 


17.0 


21.5 


17.5 


18.5 


16.5 


23 


15.0 


13.5 


18.5 


15.5 


21.0 


15.5 


21.0 


17.0 


21.0 


18.0 


19.5 


17.0 


24 


17.0 


13.5 


18.0 


16.0 


21.5 


15.5 


20.0 


17.0 


21.0 


18.0 


20.0 


17.0 


2S 


16.0 


14.0 


18.0 


15.5 


21.5 


15.0 


20.5 


17.0 


21.5 


18.0 


20.0 


17>0 


26 


16.0 


14.0 


18.0 


16.0 


20.0 


16.0 


21.0 


17.0 


21.5 


18.5 


19.5 


17.0 


27 


16.5 


13.5 


18.0 


16.0 


19.0 


15.0 


20.5 


16.5 


22.0 


18.0 


20.0 


17.0 


28 


17.0 


13.5 


18.5 


15.5 


19.0 


15.0 


20.5 


16.5 


21.5 


17.5 


20.0 


17.0 


29 


17.5 


14.0 


20.0 


16.0 


20.5 


15.0 


20.5 


16.5 


21.0 


17.5 


19.5 


17.0 


30 


18.5 


14.0 


19.0 


16.0 


20.0 


15.0 


23,0 


17.0 


20.5 


17.5 


19.5 


17.0 


31 








19.5 


16.0 








24.0 


17.5 


20.5 


17.5 









MONTH 



18.5 



12.5 



20.0 



13.5 



21.5 



14.5 



24.0 



15.0 



22.0 



17.5 



22.0 



16.5 



SAN FRANCISCO BAY 



20S 



11181360 POINT SAN PABLO STRAIT AT POINT SAN PABLO, CA— Continued 

WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

(LOWER PROBE) 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



OCTOBER 



1 


19.5 


17.5 


2 


19.5 


17.5 


3 


19.5 


17.5 


4 


19.5 


18.0 


5 


19.5 


18.0 


6 


20.0 


18.0 


7 


20.0 


18.0 


8 


20.0 


18.0 


9 


20.0 


17.5 


10 


20.5 


17.5 


11 


20.5 


17.5 


12 


19.5 


17.5 


13 


19.5 


17.5 


14 


19.0 


17.5 


15 


18.5 


17.0 


16 


18.5 


17.0 


17 


18.5 


17.0 


18 


18.5 


17.0 


19 


18.5 


17.0 


20 


18.5 


17.0 


21 


18.5 


17.0 


22 


19.0 


17.0 


23 


19.0 


17.0 


24 


18.5 


17.0 


25 


18.0 


17.0 


26 


18.5 


17.0 


27 


18.5 


17.0 


28 


17.5 


17.0 


29 


17.5 


16.5 


30 


17.5 


16.5 


31 


17.5 


16.5 



NOVEMBER 


17.5 


16.5 


18.0 


17.0 


18.0 


17.0 


18.0 


16.5 


18.0 


16.5 


18.0 


16.5 


18.0 


16.5 


17.0 


16.5 


17.0 


16.0 


16.5 


15.0 


16.0 


14.5 


16.0 


14.5 


15.5 


14.0 


15.5 


14.5 


15.5 


14.5 


15.5 


15.0 


15.5 


15.0 


15.5 


15.0 


15.0 


14.5 


15.0 


13.5 


14.5 


13.0 


14.5 


14.0 


14.0 


13.0 


14.0 


11.5 


13.5 


12.0 


13.5 


12.5 


13.5 


13.0 


13.5 


13.0 


13.5 


12.5 


13.5 


12.0 



DECEMBER 


13.0 


12.5 


13.0 


12.5 


13.0 


12.5 


13.0 


12.0 


13.0 


12.0 


12.5 


12.0 


12.5 


11.5 


12.5 


11.5 


13.0 


12.0 


13.0 


12.0 


12.5 


12.0 


12.5 


10.5 


12.5 


10.0 


12.0 


11.0 


12.0 


11.0 


12.0 


10.5 


12.0 


10.5 


12.0 


10.0 


11.5 


10.0 


11.5 


10.0 


11.5 


10.0 


11.5 


10.0 


11.5 


9.5 


11.0 


9.0 


11.0 


8.5 


10.5 


8.0 


10.5 


7.5 


10.5 


8.5 


10.5 


8.5 


10.0 


8.5 


10.0 


9.0 



JANUARY 


10.0 


9.0 


10.5 


8.5 


10.5 


8.0 


10.0 


8.0 


10.0 


7.5 


10.0 


8.0 


10.0 


7.5 


10.0 


8.0 


10.0 


8.0 


10.0 


8.0 


9.5 


7.5 


9.5 


6.5 


9.5 


7.5 


9.5 


8.0 


9.5 


7.5 


9.5 


8.0 


10.0 


8.0 


10.0 


8.5 


10.0 


8.0 


10.0 


8.5 


10.0 


9.0 


10.5 


9.0 


10.5 


9.0 


10.5 


9.0 


10.5 


9.0 


11.0 


9.5 


11.0 


9.5 


11.0 


9.5 


11.0 


9.5 


11.0 


9.5 


11.5 


9.5 



FEBRUARY 


11.5 


10.0 


11.5 


10.0 


11.5 


10.5 


11.5 


10.5 


12.0 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.5 


12.0 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.0 


12.0 


10.5 


12.0 


11.0 


12.0 


10.5 


12.0 


10.0 


12.0 


10.5 


12.0 


10.0 


12.0 


10.5 


12.0 


10.0 



MARCH 



12.0 


10.5 


12.5 


11.0 


13.5 


12.0 


13.5 


12.0 


14.0 


12.0 


14.5 


12.5 


14.5 


12.5 


14.5 


13.0 


14.0 


13.0 


14.5 


13.5 


15.0 


13.5 


15.0 


13.5 


15.5 


14.0 


15.0 


14.0 


15.5 


14.0 


15.5 


14.0 


15.5 


14.0 


16.5 


14.0 


16.0 


14.5 


17.0 


14.5 


16.5 


14.5 


17.0 


14.5 


16.0 


14.5 


16.0 


14.5 


15.5 


14.5 


15.0 


14.0 


14.5 


14.0 


14.5 


13.0 


14.5 


13.5 


14.5 


13.0 


15.0 


13.0 



MONTH 20 . 5 



16.5 



18.0 



11.5 



13.0 



7.5 



11.5 



6.5 



12.0 



10.0 



17.0 



10.5 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



AUGUST 



SEPTEMBER 



1 


14.5 


13.0 


18.5 


13.5 


19.5 


16.5 


20.0 


15.0 


22.0 


17.5 


20.5 


17.5 


2 


15.0 


13.0 


17.5 


13.5 


19.0 


16.5 


20.0 


15.0 


21.5 


17.5 


21.0 


17.5 


3 


15.5 


13.0 


17.0 


13.0 


18.5 


16.5 


19.5 


15.5 


21.0 


18.0 


20.5 


18.0 


4 


16.0 


13.0 


17.0 


13.5 


18.5 


16.5 


19.5 


15.0 


21.0 


18.0 


20.5 


18.0 


5 


15.5 


13.5 


17.0 


13.5 


18.0 


16.5 


19.5 


15.0 


21.5 


18.0 


20.0 


18.0 


6 


15.0 


13.5 


17.0 


13.5 


18.0 


16.5 


19.5 


15.5 


21.0 


18.0 


19.5 


18.0 


7 


15.5 


13.5 


17.0 


13.5 


18.5 


16.5 


19.0 


16.0 


20.5 


18.0 


20.5 


18.0 


8 


15.0 


13.5 


16.5 


13.5 


19.0 


16.5 


19.0 


16.0 


20.5 


18.0 


20.5 


18.0 


9 


15.0 


13.5 


17.0 


13.5 


19.0 


16.5 


18.5 


16.0 


20.5 


18.0 


20.5 


18.0 


10 


15.0 


13.5 


17.5 


13.0 


18.5 


16.0 


18.5 


16.0 


20.0 


18.0 


20.0 


18.0 


11 


15.0 


13.5 


16.5 


13.5 


19.0 


15.5 


18.5 


16.0 


20.5 


17.5 


20.0 


18.0 


12 


14.5 


13.0 


17.0 


13.5 


19.5 


14.5 


18.5 


16.0 


20.5 


18.0 


19.5 


17.5 


13 


15.0 


12.5 


17.0 


13.5 


19.5 


14.5 


18.5 


16.0 


20.0 


18.0 


19.5 


17.5 


14 


15.5 


12.5 


17.5 


13.0 


20.0 


13.5 


18.5 


16.0 


20.0 


17.5 


19.0 


17.0 


15 


16.0 


12.0 


17.0 


13.5 


19.5 


14.0 


19.0 


17.0 


19.5 


17.5 


19.0 


17.0 


16 


15.0 


12.0 


17.5 


14.0 


20.5 


14.0 


19.5 


16.5 


22.0 


17.5 


19.0 


17.0 


17 


14.5 


12.0 


17.0 


14.5 


21.0 


14.0 


20.0 


17.0 


21.0 


17.5 


19.0 


16.5 


18 


16.5 


12.5 


17.5 


14.5 


19.5 


14.0 


20.0 


17.0 


20.5 


17.5 


19.0 


16.5 


19 


16.0 


12.5 


17.5 


14.5 


19.5 


14.5 


20.0 


16.5 


20.5 


17.5 


19.0 


16.5 


20 


16.0 


13.0 


18.0 


14.5 


19.5 


14.5 


20,0 


16.5 


21.0 


17.5 


19.0 


16.5 


21 


16.0 


13.5 


18.0 


15.0 


19.0 


15.0 


20.0 


16.5 


21.0 


17.5 


18.5 


16.5 


22 


15.5 


13.5 


18.0 


15.0 


19.0 


15.0 


21.0 


17.0 


21.0 


17.5 


18.5 


17.0 


23 


15.0 


13.5 


18.5 


15.5 


19.5 


15.0 


20.5 


17.5 


20.5 


17.5 


18.5 


17.0 


24 


15.0 


13.5 


18.0 


15.0 


20.5 


15.0 


20.0 


17.0 


20.5 


17.5 


18.5 


17.0 


25 


16.0 


13.5 


18.0 


15.0 


21.0 


15.5 


20.0 


17.0 


21.0 


17.5 


19.0 


17.0 


26 


15.5 


13.5 


18.0 


15.5 


20.0 


15.5 


20.0 


17.0 


21.0 


17.5 


19.5 


17.0 


27 


16.5 


13.0 


18.0 


15.5 


19.0 


15.0 


20.5 


17.0 


21.5 


18.0 


19.0 


17.0 


28 


16.5 


13.0 


18.5 


15.5 


19.0 


15.0 


20.5 


16.5 


21.5 


17.5 


19.5 


16.5 


29 


17.0 


13.0 


19.5 


16.0 


19.5 


15.0 


19.5 


16.5 


20.5 


17.5 


19.5 


16.5 


30 


18.0 


13.0 


19.0 


16.0 


20.0 


15.0 


21.0 


17.0 


20.0 


17.0 


19.5 


16.5 


31 








18.5 


16.0 








22.0 


17.5 


20.0 


17.0 









MONTH 



18.0 



12.0 



19.5 



13.0 



21.0 



13.5 



22.0 



15.0 



22.0 



17.0 



21.0 



16.5 



206 



WILDCAT CREEK BASIN 
11181390 WILDCAT CREEK AT VALE ROAD, AT RICHMOND. CA 



LOCATION. --Lat 37*57'12", long 122'20'1*". in San Pablo Grant, Contra Costa County, Hydrologlc Unit 18050002, on 
left bank at upstream side of Vale Road Bridge at Richmond, 3.6 mi upstream from mouth. 

DRAINAGE AREA.— 7.79 mi^. 

PERIOD OF RECORD. — October 197S to current year. 

REVISED RECORDS.— WDR CA-81-2: 1979-80 (M). 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage Is 65. S6 ft above sea level. 

REMARKS. --Records poor. Minor storage in Lake Anza and Jewel Lake 5 mi upstream. No diversion upstream from 
station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 2,050 ft^/s, Jan. *, 1982, gage height, 1* . 68 ft recorded, 
15.80 ft from floodmarks, from rating curve extended above AOO ft /s on basis of slope-area measurement of 
peak flow; no flow at times in 1979, 1987-92. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 200 ft^/s and maximum (*) 

Discbarge Gage height 
Data Time (ft^/s) (ft) Data Time 



Discharge Gage height 
(ft^/s) (ft) 



Jan. 


1 


0815 


323 


5.66 


Jan. 


7 


0200 


397 


6.14 


Jan. 


13 


0530 


*1,170 


10.37 



Jan. 


15 


1900 


375 


6.00 


Jan. 


20 


1830 


646 


7.61 


Feb. 


19 


unknown 


unknown 


unknown 



No flow many days . 



DISCHARGE, 



DAY 



CCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



1993 



JUL 



AUG 



SEP 



1 


.08 


.05 


.19 


122 




4 .4 


el3 


5.0 


.87 


.59 


.01 


.03 


.02 


2 


.04 


.07 


3.9 


23 




e4.3 


elO 


3.5 


.87 


.40 


.01 


.03 


.01 


3 


.00 


.08 


.44 


10 




e4.2 


e8.4 


3.2 


.87 


.36 


.01 


.01 


.00 


4 


.00 


.08 


.15 


7. 


7 


e4.2 


e7.2 


3.0 


.87 


14 


.00 


.01 


.01 


S 


.00 


.06 


.19 


el4 




e6.1 


e6.1 


2.8 


.87 


1.5 


.00 


.01 


.00 


6 


.00 


.06 


5.0 


e35 




e9.8 


a5.S 


2.3 


.78 


.63 


.00 


.01 


.00 


7 


.01 


.07 


5.8 


168 




e21 


e4.9 


2.3 


.74 


.48 


.01 


.01 


.00 


8 


.01 


.06 


6.1 


59 




e44 


e4.S 


2.1 


.70 


.40 


.00 


.01 


.00 





.01 


.05 


55 


26 




e32 


s4.2 


2.3 


.70 


.34 


.00 


.01 


.00 


10 


.02 


.05 


16 


19 




e24 


3.9 


2.1 


.61 


.28 


.00 


.01 


.00 


11 


.02 


.06 


6.0 


14 




e33 


3.7 


2.1 


.53 


.24 


.01 


.01 


.00 


12 


.02 


.04 


.88 


41 




e20 


3.5 


2.0 


.47 


.24 


.01 


.00 


.00 


13 


.02 


.05 


.22 


590 




elS 


3.6 


1.8 


.46 


.20 


.00 


.00 


.00 


14 


.03 


.05 


.08 


157 




el3 


3.5 


1.7 


.41 


.19 


.01 


.00 


.00 


15 


.02 


.04 


.04 


el06 




elO 


3.4 


1.7 


.40 


.18 


.01 


.00 


.00 


16 


.03 


.03 


.03 


e6g 




eS.l 


5.0 


1.6 


.40 


.19 


.00 


.01 


.00 


17 


.04 


.04 


.10 


e52 




el2 


13 


2.8 


.40 


.13 


.01 


.01 


.00 


18 


.05 


.03 


.08 


e73 




e80 


6.8 


2.2 


.40 


.08 


.01 


.01 


.00 


19 


.05 


.04 


.05 


e48 




el73 


5.0 


1.6 


.40 


.05 


.01 


.00 


.00 


20 


.06 


.02 


.05 


e332 




ell8 


4.1 


1.6 


.40 


.05 


.01 


.01 


.00 


21 


.05 


.05 


e.02 


117 




e49 


3.4 


1.4 


.40 


.09 


.01 


.01 


.00 


22 


.04 


.08 


e.03 


61 




e68 


3.2 


1.3 


.40 


.10 


.01 


.01 


.00 


23 


.06 


.06 


a. 03 


25 




ell8 


4.7 


1.4 


.38 


.08 


.02 


.00 


.00 


24 


.05 


.07 


a. OS 


16 




ego 


5.9 


2.1 


1.3 


.05 


.01 


.01 


.00 


25 


.05 


.12 


a. 04 


11 




e50 


3.1 


1.4 


1.3 


.02 


.01 


.02 


.00 


26 


.07 


.13 


a. OS 


8. 


9 


e31 


3.2 


1.3 


.89 


.01 


.02 


.02 


.00 


27 


.06 


.14 


e.09 


7. 


5 


e23 


5.5 


1.2 


.83 


.01 


.01 


.02 


.00 


28 


.06 


.15 


e69 


6. 


3 


el7 


4.0 


1.1 


.53 


.01 


.01 


.02 


.00 


29 


6.5 


.15 


e9.8 


5. 


6 





2.9 


1.0 


.41 


.01 


.01 


.01 


.00 


30 


.05 


.16 


e3.6 


5. 


1 





3.0 


.91 


.55 


.01 


.01 


.01 


.00 


31 


.05 





2.4 


4. 


7 





3.4 





.86 





.02 


.01 


— 


TOTAL 


7.55 


2.14 


185.41 


2233. 


8 


1079.1 


161.6 


60.81 


20.00 


20.92 


0.26 


0.33 


0.04 


MEAN 


.24 


.071 


5.98 


72. 


1 


38.5 


5.21 


2.03 


.65 


.70 


.008 


.011 


.001 


MAX 


6.5 


.16 


69 


590 


173 


13 


5.0 


1.3 


14 


.02 


.03 


.02 


MIN 


.00 


.02 


.02 


4. 


7 


4.2 


2.9 


.91 


.38 


.01 


.00 


.00 


.00 


AC-FT 


15 


4.2 


368 


4430 


2140 


321 


121 


40 


41 


.5 


.7 


.08 


a Eg 


itimated. 



























WILDCAT CREEK BASIN 



207 



11181390 WILDCAT CREEK AT VALE ROAD, AT RICHMOND, CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1976 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.51 


2.34 


5.63 


13.6 


17.3 


12.8 


4.41 


.81 


.34 


.18 


.13 


.18 


MAX 


2.20 


8.89 


27.8 


72.1 


77.8 


63.4 


36.1 


4.68 


1.52 


.83 


.47 


.88 


(WY) 


1987 


1982 


1982 


1993 


1986 


1983 


1982 


1983 


1963 


1983 


1983 


1986 


MIN 


.005 


.071 


.14 


.064 


.60 


.28 


.14 


.022 


.004 


.001 


.004 


.000 


(WY) 


1989 


1993 


1990 


1991 


1989 


1988 


1990 


1992 


1987 


1989 


1987 


1988 



SU^t1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1976 - 1993 



806.77 






3771.96 




2.20 






10.3 




70 


Mar 


6 


590 


Jan 13 


.00 


May 


16 


.00 


Oct 3 


.00 


May 


24 


.00 
1170 
10.37 


Sep 5 
Jan 13 
Jan 13 


1600 






7480 




4.0 






19 




.05 






.19 




.00 






.00 





4.79 








15.3 






1982 


.43 






1976 


1010 


Jan 




1982 


.00 


Aug 


31 


1979 


.00 


Jun 


11 


1987 


2050 


Jan 




1982 


15.80 


Jan 




1982 


3470 








7.4 








.26 








.01 









208 



PACHECO CREEK BASIN 
11182500 SAN RAMON CREEK AT SAN RAMON, CA 



LOCATION. --Lat 37'46'23", long 121'59'37". in sec. 8, T.2 S., R. 1 W. , Contra Costa County, Hydrologlc Unit 
18050001, on right bank 0.2 ml downstream from Bollinger Creek and 1.0 mi southwest of San Ramon. 

DRAINAGE AREA. --5. 89 mi^. 

PERIOD OF RECORD. --October 1952 to current year. 

REVISED RECORDS. --WSP 1AA5: 1953-5A(P). 

GAGE. --Water-stage recorder and concrete control. Elevation of gage is 530 ft above sea level, from topographic 
map. 

REMARKS. --Records good. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 1,600 ft^/s, Oct. 13, 1962, gage height. 16.98 ft, from rating 
curve extended above 200 ft /s on basis of culvert computations at gage heights 11.80, 12.09, 14.20, and 
16.98 ft; no flow for parts of most years. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 200 ft^/s and maximum (*); 

Discbarge Gage height 
Data Time (ft^/s) (ft) Date Time 



Discharge Gage height 
(ft^/s) (ft) 



Jan. 


7 


0130 


225 


3.89 


Jan. 


13 


0600 


*718 


*7.37 



Jan. 20 
Feb. 18 



1745 
2300 



543 
335 



6.02 
4.57 



No flow for many days . 



DAY 



OCT 



DISCHARGE , 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.01 


.00 


.00 


47 




7.9 


9.7 


el2 


1.6 


1.2 


.48 


.13 


.02 


2 


.01 


.00 


.03 


7. 


.4 


7.4 


9.0 


e8.5 


1.6 


1.1 


.46 


.09 


.01 


3 


.01 


.00 


.01 


3. 


6 


7.0 


8.6 


e5.5 


2.1 


1.0 


.48 


.08 


.02 


4 


.01 


.00 


.00 


2. 


.6 


6.6 


7.9 


e5.7 


1.8 


1.1 


.41 


.10 


.07 


S 


.01 


.00 


.00 


1. 


9 


6.3 


7.4 


e5.1 


1.6 


1.4 


.36 


.13 


.07 


6 


.01 


.00 


.88 


5. 


6 


5.9 


6.8 


e4.8 


1.5 


1.2 


.35 


.15 


.06 


7 


.01 


.00 


.62 


44 




5.6 


6.4 


e4.4 


1.5 


1.1 


.33 


.16 


.03 


8 


.00 


.00 


1.9 


17 




6.4 


6.3 


e4.1 


1.4 


.99 


.31 


.15 


.02 


a 


.00 


.00 


25 


8. 


6 


7.0 


5.8 


e3.9 


1.3 


.97 


.31 


.16 


e.02 


10 


.00 


.00 


3.7 


6. 


2 


6.0 


5.7 


e3.6 


1.3 


.89 


.31 


.18 


• .02 


11 


.00 


.00 


2.4 


4. 


5 


5.7 


5.4 


83.5 


1.4 


.87 


.31 


.10 


.02 


12 


.00 


.00 


.77 


18 




5.2 


5.1 


83.3 


1.4 


.87 


.31 


.18 


.03 


13 


.00 


.00 


.40 


227 




4.8 


4.8 


83.2 


1.3 


.87 


.27 


.18 


.03 


14 


.00 


.00 


.31 


45 




4.5 


4.8 


83.1 


1.3 


.79 


.27 


.19 


.01 


15 


.00 


.01 


.27 


22 




4.3 


4.5 


e3.0 


1.3 


.78 


.27 


.15 


.01 


16 


.00 


.01 


.21 


18 




4.0 


4.5 


e3.0 


1.2 


.78 


.28 


.13 


.02 


17 


.00 


.01 


.82 


23 




4.2 


13 


e6.0 


1.2 


.71 


.27 


.12 


.03 


18 


.00 


.01 


.39 


17 




20 


12 


e7.0 


1.2 


.70 


.24 


.14 


.07 


19 


.00 


.01 


.24 


13 




39 


9.4 


e4.7 


1.1 


.68 


.23 


.13 


.07 


20 


.00 


.00 


.23 


72 




19 


7.7 


e3.5 


1.1 


.64 


.23 


.10 


.06 


21 


.02 


.00 


.23 


57 




16 


6.5 


e2.6 


1.1 


.66 


.25 


.07 


.05 


22 


.00 


.01 


.22 


35 




14 


5.8 


82.8 


1.1 


.70 


.23 


.05 


.03 


23 


.00 


.00 


.19 


24 




26 


5.4 


e3.4 


1.0 


.70 


.23 


.04 


.04 


24 


.00 


.00 


.21 


20 




15 


el4 


e4.0 


1.3 


.62 


.22 


.03 


.04 


2S 


.00 


.00 


.23 


17 




13 


eS.O 


e3.0 


1.6 


.57 


.19 


.02 


.03 


26 


.01 


.00 


.23 


15 




21 


el3 


e2.4 


1.1 


.54 


.19 


.01 


.02 


27 


.01 


.00 


.20 


14 




12 


el2 


2.2 


1.2 


.52 


.21 


.01 


.01 


28 


.01 


.00 


8.8 


12 




11 


elO 


1.9 


1.1 


.60 


.19 


.01 


.01 


29 


.06 


.00 


18 


11 







e8.2 


1.7 


1.0 


.56 


.20 


.03 


.01 


30 


.02 


.00 


5.6 


9. 


6 





e8.0 


1.6 


.97 


.53 


.19 


.03 


.01 


31 


.00 





1.9 


8. 


7 





e7.8 





1.2 





.16 


.02 





TOTAL 


0.20 


0,06 


73.99 


826. 


7 


304.8 


243.5 


124.5 


40,87 


24.64 


8.74 


3.16 


0.94 


MEAN 


.006 


.002 


2.39 


26. 


7 


10.9 


7.85 


4.15 


1.32 


.82 


.28 


.10 


.031 


MAX 


.06 


.01 


25 


227 


39 


14 


12 


2.1 


1.4 


.48 


.19 


.07 


MIN 


.00 


.00 


.00 


1. 


9 


4.0 


4.5 


1.6 


.97 


.52 


.16 


.01 


.01 


AC-FT 


.4 


.1 


147 


1640 


605 


483 


247 


81 


49 


17 


6.3 


1.9 


e Es 


timated. 



























PACHECO CREEK BASIN 



209 



11182500 SAN RAMON CREEK AT SAN RAMON, CA--Contlnued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1953 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


.54 


.63 


3.37 


8.38 


9.09 


7.35 


4.88 


1.31 


.51 


.19 


.075 


.050 


MAX 


17.0 


5.49 


27.2 


30.8 


45.4 


60.6 


44.9 


4.92 


1.99 


.83 


.40 


.33 


(Wf) 


1963 


1984 


1956 


1956 


1986 


1983 


1958 


1967 


1967 


1958 


1983 


1982 


MIN 


.000 


.000 


.001 


.002 


.039 


.17 


.016 


.000 


.000 


.000 


.000 


.000 


(WY) 


1953 


1956 


1977 


1991 


1991 


1977 


1977 


1977 


1976 


1955 


1954 


1954 



SU»1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1953 - 1993 



354.21 
.97 






37 
.00 
.00 


Feb 
Aug 
Aug 


12 

8 
8 


703 
2.0 
.06 
.00 







1652.10 






4.53 






227 


Jan 


13 


.00 


Oct 


8 


.00 


Oct 


8 


718 


Jan 


13 


7.37 


Jan 


13 


3280 






12 






.68 






.00 







3.00 








12.4 






1983 


.029 






1977 


411 


Oct 


13 


1962 


.00 


Oct 


1 


1952 


.00 


Oct 


1 


1952 


1600 


Oct 


13 


1962 


16.98 


Oct 


13 


1962 


2170 








5.9 








.27 








.00 









210 



NAPA RIVER BASIN 
11456000 NAPA RIVER NEAR ST. HELENA, CA 



LOCATION. --Lat 38*29'52", long 122'25'37", in Came Humana Grant, Napa County, Hydrologic Unit 18050002, on right 
bank 0.2 ml upstream from highway bridge, 1.3 ml northeast of Zlnfandel, and 2.5 mi east of St. Helena. 

DRAINAGE AREA.— 81.* mi^. 

PERIOD OF RECORD. --October 1929 to September 1932, October 1939 to current year. Monthly discharge only for some 
periods, published in WSP 1315-B. 

REVISED RECORDS.— WSP 1929: Drainage area. WDR CA-78-2: 1977(M). 

GAGE. --Water- stage recorder. Datum of gage is 170.12 ft above sea level. Prior to Nov. 22, 1958, at datum 
3.00 ft higher. Nov. 22, 1958, to July 22, 1976, at datum 2.00 ft higher. 

a 

REMARKS. --No estimated daily discharges. Records good above 10 ft /s and fair beloM. Some regulation by Kimball 
Creek Reservoir, capacity 344 acre-ft, since 1939, and Bell Canyon Reservoir, capacity, 2,530 acre-ft, sine* 
1959. Small diversions upstream from station for irrigation of about 1,500 acres. 



ight, 18.52 ft, from 
flow; no flow at times. 



EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 16,900 ff'/s, Feb. 17, 1986, gage hi 
rating curve extended above 11,000 ft /s on basis of slope-area measurement of peak 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 4,200 ft^/s and maximum (*): 

Discharge Gage height 
Date Time (ft^/s) (ft) Date Time 

Jan. 20 1945 •7,930 *16.67 

Minimum daily, 0.16 ft^/s, Oct. 4-6, 13, 14. 



Discharge 
(ft^/s) 



Gage height 
(ft) 



DISCHARGE, 



DAY 



OCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.22 


12 


1. 


7 


1840 


105 


195 


73 


29 


17 




4.9 


1.4 


.49 


2 


.19 


4.5 


3. 


5 


462 


96 


169 


64 


28 


15 




4.1 


1.5 


.47 


3 


.18 


2.6 


8. 


2 


251 


90 


160 


61 


29 


15 




4.0 


2.1 


.47 


4 


.16 


1.8 


4. 


5 


167 


83 


133 


59 


28 


41 




3.9 


2.0 


.53 


S 


.16 


1.7 


2. 


9 


129 


90 


117 


55 


27 


47 




3.5 


2.0 


.48 


6 


.16 


1.6 


39 




293 


81 


105 


52 


27 


28 




3.9 


1.6 


.46 


7 


.20 


1.4 


75 




1020 


85 


96 


50 


26 


25 




4.4 


1.4 


.44 


8 


.22 


1.4 


232 




495 


204 


88 


50 


24 


22 




4.2 


1.0 


.44 


9 


.24 


1.4 


864 




346 


230 


81 


52 


23 


20 




3.8 


1.1 


.44 


10 


.22 


1.5 


941 




269 


183 


76 


47 


23 


19 




3.5 


1.4 


.42 


11 


.21 


1.6 


562 




201 


476 


73 


44 


22 


17 




3.5 


1.3 


.41 


12 


.18 


1.6 


190 




231 


275 


68 


42 


21 


16 




3.5 


1.0 


.40 


13 


.16 


1.7 


92 




1800 


205 


64 


40 


20 


16 




3.4 


.89 


.39 


14 


.16 


1.7 


58 




1420 


167 


61 


38 


20 


15 




3.2 


.85 


.39 


IS 


.17 


1.4 


40 




828 


140 


59 


37 


19 


14 




3.2 


.83 


.41 


16 


.18 


1.6 


32 




968 


122 


62 


35 


19 


13 




3.2 


.80 


.41 


17 


.19 


1.8 


28 




685 


252 


208 


81 


18 


13 




3.1 


.77 


.41 


18 


.22 


1.7 


24 




619 


695 


213 


83 


17 


12 




3.3 


.77 


.41 


19 


.22 


1.7 


21 




420 


1290 


140 


55 


16 


12 




3.5 


.59 


.40 


20 


.21 


1.7 


17 




4610 


1070 


111 


47 


17 


9. 


9 


3.5 


.58 


.40 


21 


.23 


1.7 


IS 




2360 


638 


95 


43 


17 


9. 


8 


3.2 


.62 


.38 


22 


.22 


2.0 


13 




2050 


483 


86 


41 


14 


9. 


8 


3.2 


.71 


.36 


23 


.23 


2.0 


12 




764 


1720 


101 


42 


14 


9. 


2 


3.2 


.67 


.36 


24 


.24 


2.0 


9. 


8 


491 


903 


130 


47 


18 


9. 


1 


2.9 


.57 


.37 


25 


.24 


2.1 


8. 


2 


358 


545 


104 


39 


22 


8. 


1 


2.4 


.55 


.37 


26 


.24 


2.0 


7. 


4 


280 


391 


91 


37 


21 


8. 


1 


1.6 


.54 


.37 


27 


.25 


1.9 


5. 


9 


225 


299 


86 


36 


22 


8. 





2.6 


.52 


.36 


28 


.26 


1.8 


117 




186 


237 


88 


35 


20 


7. 


2 


2.8 


.47 


.36 


29 


18 


1.7 


251 




156 





78 


32 


16 


6. 


3 


2.7 


.45 


.36 


30 


27 


1.7 


219 




136 





71 


31 


17 


6. 





2.1 


.44 


.36 


31 


12 





298 




117 





70 





20 


-- 


■- 


1.6 


.51 





TOTAL 


62.76 


65.3 


4192. 


1 


24177 


11155 


3279 


1448 


654 


468. 


5 


101.9 


29.93 


12.32 


MEAN 


2.02 


2.18 


135 


780 


398 


106 


48.3 


21.1 


15. 


6 


3.29 


.97 


.41 


MAX 


27 


12 


941 


4610 


1720 


213 


83 


29 


47 


4.9 


2.1 


.53 


MIN 


.16 


1.4 


1. 


7 


117 


81 


59 


31 


14 


6. 





1.6 


.44 


.36 


AC -FT 


124 


130 


8320 


47960 


22130 


6500 


2870 


1300 


929 


202 


59 


24 



NAPA RIVER BASIN 



211 



11456000 NAPA RIVER NEAR ST. HELENA, CA— Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1930 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


5.44 


38.0 


179 


295 


305 


192 


90.9 


21.7 


7.41 


2.54 


1.27 


.97 


MAX 


179 


415 


1088 


1338 


1798 


1144 


584 


93.0 


27.3 


7.66 


4.43 


6.44 


(WY) 


1963 


1974 


1956 


1970 


1986 


1983 


1982 


1983 


1967 


1941 


1941 


1982 


MIN 


.000 


.10 


.24 


2.17 


4.34 


7.45 


1.81 


.89 


.081 


.000 


.000 


.000 


(WY) 


1978 


1932 


1940 


1991 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 



SUfWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1930 - 1993 



17088.95 
46.7 






1300 

.10 
.12 


Feb 
Sep 
Sep 


20 
25 
22 


33900 
101 
4.6 
.22 







45645. 


81 






125 








4610 




Jan 


20 




16 


Oct 


4 




18 


Oct 


11 


7930 




Jan 


20 


16. 


67 


Jan 


20 


90540 








271 








15 


37 







94.1 








270 






1983 


1.90 






1977 


13700 


Feb 


17 


1986 


.00 


Sep 


23 


1947 


.00 


Sep 


23 


1947 


16900 


Feb 


17 


1986 


18.52 


Feb 


17 


1986 


68180 








183 








7.4 








.43 









212 NAPA RIVER BASIN 

IHSSOOO NAPA RIVER NEAR NAPA. CA 
(National Stream Quality Accounting Network Station) 

LOCATION. --Let 38*22'06", long 122'18'08", in Yajome Grant. Napa County. Hydrologic Unit 18050002, on left bank 
at downstream side of Oak Knoll Avenue Bridge, O.A ml downstream from Dry Creek, 5 mi north of Napa, and 
12.6 mi downstream from Conn Dam. 



DRAINAGE AREA.--218 mi' 



WATER-DISCHARGE RECORDS 



PERIOD OF RECORD. --October 1929 to September 1932, October 1959 to current year. Monthly discharge only for some 
periods, published in WSP 1315-B. 

REVISED RECORDS. --WSP 1315-B: 1930(M). WDR CA-87-2: 1963(M), 1965(M), 1967(M), 1982-85. 

GAGE. --Water-stage recorder. Datum of gage is 2A.74 ft above sea level. 

REMARKS. --No estimated daily discharges. Records good. Flow regulated by Lake Hennessey beginning in December 
19A5, 12.8 mi upstream, capacity 31,000 acre-ft; Rector Reservoir beginning in 19A8, 12. A mi upstream, 
capacity 4,400 acre-ft; Bell Canyon Reservoir beginning in 1959, 19.6 mi upstream, capacity 2,530 acre-ft. 
Diversions for irrigation upstream from station of about 10,000 acres. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 37,100 ft^/s, Feb. 18, 1986, gage height, 30.20 ft, from 
floodmarks; no flow at times. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 13,000 ft^/s, Jan. 20, gage height, 24.73 ft; no flow. Oct. 1-3. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


9.2 


2. 


7 


3040 


306 


587 


174 


67 


42 


8.9 


2.8 


3.1 


2 


.00 


9.0 


3. 


2 


980 


285 


517 


160 


65 


38 


8.5 


2.6 


2.4 


3 


.00 


7.2 


4. 


7 


511 


269 


477 


149 


63 


38 


7.2 


2.3 


2.2 


4 


.04 


5.6 


S. 


8 


376 


2S3 


423 


142 


63 


39 


6.9 


1.6 


2.3 


5 


.06 


4.9 


S. 


4 


307 


278 


374 


127 


59 


90 


6.4 


.43 


2.8 


6 


.42 


4.3 


10 




391 


253 


354 


118 


58 


57 


6.5 


.71 


3.4 


7 


.39 


4.0 


98 




1860 


243 


325 


111 


57 


51 


6.9 


1.9 


3.4 


B 


.29 


4.0 


147 




1060 


521 


300 


105 


56 


48 


6.8 


2.4 


3.4 


9 


.22 


3.6 


1360 




670 


524 


279 


108 


56 


47 


6.1 


2.2 


2.9 


10 


.08 


3.4 


1060 




519 


439 


262 


102 


55 


45 


5.2 


1.4 


3.0 


11 


.OS 


2.9 


1230 




420 


775 


252 


94 


55 


43 


6.4 


2.8 


2.7 


12 


.21 


2.3 


419 




421 


585 


242 


92 


55 


42 


6.9 


3.5 


2.9 


13 


.27 


2.7 


219 




3480 


458 


220 


88 


54 


31 


6.0 


3.8 


3.0 


14 


.28 


2.7 


137 




2960 


390 


200 


86 


54 


27 


4.6 


4.0 


2.5 


IS 


.24 


2.7 


104 




1770 


340 


189 


84 


54 


25 


4.1 


4.0 


2.6 


16 


.22 


2.7 


78 




2160 


305 


182 


82 


54 


24 


3.8 


3.9 


2.2 


17 


.23 


2.6 


66 




1360 


476 


386 


114 


53 


23 


4.2 


4.4 


1.6 


18 


.19 


2.6 


59 




1310 


1640 


445 


174 


48 


20 


4.9 


4.5 


1.1 


19 


.18 


4.3 


53 




831 


3950 


349 


111 


47 


16 


4.2 


4.6 


1.5 


20 


.31 


3.5 


47 




7600 


3150 


285 


95 


46 


15 


5.5 


4.6 


2.0 


21 


.32 


3.2 


40 




7780 


1800 


252 


87 


45 


15 


4.9 


3.6 


1.9 


22 


.16 


3.6 


36 




5430 


1300 


221 


84 


43 


15 


5.1 


3.8 


2.2 


23 


.19 


3.6 


33 




2150 


3680 


226 


85 


41 


14 


5.5 


4.2 


2.2 


24 


.30 


3.6 


32 




1400 


2570 


290 


91 


39 


13 


5.7 


4.4 


1.9 


25 


.30 


3.4 


30 




1050 


1480 


251 


86 


43 


13 


5.4 


3.9 


1.8 


26 


.34 


3.2 


28 




845 


1070 


219 


85 


42 


11 


4.4 


3.3 


1.7 


27 


.93 


3.2 


27 




667 


835 


200 


84 


46 


11 


2.0 


1.6 


1.8 


28 


1.2 


3.2 


267 




519 


685 


210 


82 


45 


11 


1.3 


1.4 


1.8 


29 


27 


2.9 


531 




443 





197 


77 


42 


10 


1.3 


2.2 


1.8 


30 


18 


3.1 


568 




382 





180 


72 


41 


9.3 


7.3 


2.5 


1.7 


31 


18 





445 




336 





169 





44 





2.0 


2.7 





TOTAL 


70.42 


117.2 


7145. 


8 


53028 


28860 


9064 


3149 


1590 


883.3 


164.9 


92.04 


69.8 


MEAN 


2.27 


3.91 


231 


1711 


1031 


292 


105 


51.3 


29.4 


5.32 


2.97 


2.33 


MAX 


27 


9.2 


1360 


7780 


3950 


587 


174 


67 


90 


8.9 


4.6 


3.4 


MIN 


.00 


2.3 


2. 


7 


307 


243 


169 


72 


39 


9.3 


1.3 


.43 


1.1 


AC-FT 


140 


232 


14170 


105200 


57240 


17980 


6250 


3150 


1750 


327 


183 


138 



NAPA RIVER BASIN 



213 



11458000 NAPA RIVER NEAR MAPA. CA--Continued 

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 - 1993. BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 

MEAN 13.9 89.6 

MAX 338 616 

(WY) 1963 1974 

MIN .000 1.10 

(WY) 1961 1991 



JUL 



AUG 



SEP 



280 


645 


660 


456 


188 


44.5 


14.3 


1474 


2672 


4089 


2598 


1341 


226 


55.6 


1984 


1970 


1986 


1983 


1982 


1983 


1967 


.73 


2.17 


.42 


2.60 


.20 


.000 


.000 


1977 


1991 


1977 


1977 


1977 


1977 


1977 



5.01 2.76 2.41 

19.4 9.43 10.7 

1983 1983 1982 

.000 .000 .000 

1961 1960 1960 



SUW1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FC» 1993 WATER YEAR 



WATER YEARS 1960 



1993 



35075.97 






104234.46 








95.8 






286 




198 
585 
.72 


1983 
1977 


2970 


Feb 


20 


7780 


Jan 21 


26200 


Feb 17 1986 


.00 


Sep 


8 


.00 


Oct 1 


.00 


Jul 14 1960 


.01 


Sap 


28 


.13 


Oct 1 


.00 


Jul 14 1960 








13000 


Jan 20 


37100 


Feb 18 1986 








24.73 


Jan 20 


30.20 


Feb 18 1986 


69570 






206700 




143600 




248 






586 




411 




8.4 






36 




13 




.31 






1.6 




.48 





214 



NAFA RIVER BASIN 



11458000 NAPA RIVER NEAR NAPA, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. — Water years 1971, 1973 to September 1993 (discontinued). 
CHEMICAL DATA: Water years 1973 to September 1993 (discontinued). 
BIOLOGICAL DATA: Water years 1978-81. 
SPECIFIC CONDUCTANCE: Water years 1978-81. 
WATER TEMPERATURE: Water years 1977-81. 
SEDIMENT DATA: Water years 1971, 1977 to September 1993 (discontinued). 

PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: June 1978 to September 1981. 
WATER TEMPERATURE: October 1976 to September 1981. 
SUSPENDED-SEDIMENT DISCHARGE: October 1976 to September 1978. 

EXTREMES FOR PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: Maximum recorded, 500 microslemens , Sept. 1, 1981; minimum recorded, 81 microsiemens. 

Mar. 1, 1979. 
WATER TEMPERATURE: Maximum recorded, 28.0*C, July 13, 1979; minimum recorded, 3.0*C, Dec. 31, 1978, Jan 1, 1979. 

WATER-QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DIS- 




PH 








BARO- 




OXYGEN, 


COLI- 


STREP- 






CHARGE, 


SPE- 


WATER 








METRIC 




DIS- 


FORM, 


TOCOCCI 






INST. 


CIFIC 


WHOLE 








PRES- 




SOLVED 


FECAL, 


FECAL, 






CUBIC 


CON- 


FIELD 


TEMPER- 


TUR- 


SURE 


OXYGEN. 


(PER- 


0.7 


KF AGAR 






FEET 


DUCT- 


(STAND- 


ATURE 


BID- 


(»1 


DIS- 


CENT 


UM- 


-MF 


(COLS. 


DATE 


TIME 


PER 


ANCE 


ARD 


WATER 


ITY 




DF 


SOLVED 


SATUR- 


(COLS./ 


PER 






SECOND 


(US/CM) 


UNITS) 


(DEG C) 


(NTU) 


HG) 


(HG/L) 


ATION) 


100 


ML) 


100 ML) 


NOV 






























18... 


1115 


2.7 


519 


8.0 


10.5 





.50 




766 


9.9 


88 




59 


K12 


JAN 






























27... 


1430 


617 


267 


7.9 


10.5 


17 






763 


9.4 


84 




K23 


58 


MAR 






























18... 


1200 


491 


251 


8.1 


14.5 


20 






767 


9.4 


92 




800 


840 


MAY 






























25... 


1115 


44 


427 


8.3 


17.5 


2 


9 




766 


8.3 


86 




100 


160 


JUL 






























13... 


1130 


6.4 


493 


8.1 


20.0 





50 




765 


8.3 


91 




35 


26 


SEP 






























22... 


1130 


2.3 

HARD- 


549 


8.2 


15.5 





50 




765 


8.1 


81 
BICAR- 


K300 
CAR- 


66 
ALKA- 




HARD- 


NESS 




MAGNE- 








SODIUM 


POTAS- 


BONATE 


BONATE 


LINITY 




NESS 


NONCARB 


:alcium 


SIUM, 


SODIUM, 






AD- 


SIUM, 


WATER 


WATER 


WAT DIS 




TOTAL 


DISSOLV 


DIS- 


DIS- 


DIS- 






SORP- 


DIS- 


DIS IT 


DIS 


IT 


TOT IT 




(MG/L 


FLD. AS 


SOLVED 


SOLVED 


SOLVED 






TION 


SOLVED 


FIELD 


FIELD 


FIELD 


DATE 


AS 


CAC03 


(MG/L 


(MG/L 


(MG/L 


SODIUM 


RATIO 


(MG/L 


MG/L AS 


MG/L AS 


MG/L AS 




CAC03) 


(MG/L) 


AS CA) 


AS MG) 


AS NA) 


PERCENT 






AS K) 


HC03 


COS 


CAC03 


NOV 






























18... 


210 


18 


32 


32 


27 




22 




0.8 


2.2 


236 







192 


JAN 






























27... 


110 


19 


19 


15 


12 




19 




0.5 


2.2 


110 







90 


MAR 






























18... 


96 





17 


13 


12 




21 




0.5 


1.9 


117 







96 


MAY 






























25... 


180 


28 


30 


25 


21 




20 




0.7 


2.2 


183 







150 


JUL 






























13... 


210 


30 


33 


31 


23 




19 




0.7 


2.3 


219 







180 


SEP 






























22... 


240 


26 


40 


35 


24 




17 




0.7 


2.3 


266 







218 












SOLIDS, 


SOLIDS, 






NITRO- 










CHLO- FLUO- SILICA, RESIDUE 


SUM 


OF 


SOLIDS, NITRO- GEN, 


NITRO- 




SULFATE RIDE, RIDE, DIS 


AT 


180 


CONSTI- 


DIS- GEN, NITRITE 


GEN, 




DIS 


DIS 


DIS- SOLVED DEG. C 


TUENTS, 


SOLVED NITRITE DIS- 


N02+N03 




SOLVED SOLVED SOLVED (MG/L DIS- 


DIS- 


(TONS TOTAL SOLVED 


TOTAL 


DATE (MG/L (MG/L (MG/L AS 


SOLVED 


SOLVED 


PER (MG/L (MG/L 


(MG/L 




AS S04) AS CD AS 


F) SI02) (MG/L) 


(MG/L) 


AC- 


FT) AS 


N) AS 


N) 


AS 


N) 


HOV 






























18.. 


46 


32 





.20 31 




314 




321 





.43 <0 


.010 


030 





.470 


JAN 






























27.. 


28 


9 


9 


.10 31 




180 




181 





.24 





030 




— 


MAR 






























18.. 


24 


9 


<0 


.10 29 




157 




168 





21 


<o 


010 




— 


MAY 






























25.. 


51 


17 





.30 35 




266 




280 





36 


<o 


010 




— 


JUL 






























13.. 


53 


19 





.20 31 




304 




307 





41 


<o 


010 




— 


SEP 






























22.. 


54 


22 





.20 31 




326 




342 





.44 


<o 


010 




~ 



NAPA RIVER BASIN 
llA 58000 NAPA RIVER NEAR NAPA. CA- -Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



215 





NITRO- 




NITRO- 


NITRO- 








PHOS- 








GEN, 


NITRO- 


GEN, 


GEN, AM- 




PHOS- 


PHOS- 


PHORUS 


ALUM- 






N02+N03 


GEN, 


AM«)NIA 


MONIA + 


PHOS- 


PHORUS 


PHORUS 


ORTHO, 


INUM, 


BARIUM, 




DIS- 


A^WONIA 


DIS- 


ORGANIC 


PHORUS 


DIS- 


ORTHO 


DIS- 


DIS- 


DIS- 




SOLVED 


TOTAL 


SOLVED 


TOTAL 


TOTAL 


SOLVED 


TOTAL 


SOLVED 


SOLVED 


SOLVED 


DATE 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(UG/L 


(UG/L 




AS N) 


AS N) 


AS N) 


AS N) 


AS P) 


AS P) 


AS P) 


AS P) 


AS AL) 


AS BA) 


NOV 






















18... 


0.510 


0.020 


<0.010 


<0.20 


0.040 


0.060 


0.030 


0.050 


<10 


79 


JAN 






















27... 


2.00 


— 


O-OAO 


0.20 


0.080 


0.050 


-- 


0.060 


30 


50 


MAR 






















18... 


0.930 


— 


0.020 


0.30 


0.090 


0.040 


— 


0.050 


— 


— 


MAY 






















25... 


1.70 


— 


0.030 


<0.20 


0.070 


0.040 


— 


0.040 


10 


76 


JUL 






















13... 


l.AO 


— 


0.020 


0.30 


0.050 


0.060 


— 


0.040 


— 


— 


SEP 






















22... 


0.390 




0.020 


<0.20 
MANGA- 


0.040 
MOLYB- 


0.030 


SELE- 


0.030 


<10 

STRON- 


86 
VANA- 




COBALT. 


IRON, 


LITHIUM 


NESE, 


DENUM, 


NICKEL, 


NIUM, 


SILVER, 


TIUM, 


DIUM, 




DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 




SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


DATE 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 




AS CO) 


AS FE) 


AS LI) 


AS MN) 


AS MO) 


/IS NI) 


AS SE) 


/^ AG) 


AS SR> 


AS V) 


NOV 






















18... 


<3 


12 


42 


14 


<10 


2 


<1 


<1.0 


230 


«:6 


JAN 






















27... 


<3 


26 


11 


14 


<10 


3 


<1 


<1.0 


140 


<6 


MAR 

18... 
MAY 










































25... 


<3 


16 


31 


14 


<10 


2 


<1 


<1.0 


220 


<6 


JUL 

13... 
SEP 










































22... 


<3 


A 


28 


15 


<10 


2 


<1 


<1.0 


250 


<6 



CROSS-SECTIONAL DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DEPTH 


SAMPLE 




PH 




BARO- 




OXYGEN, 




SED. 






AT 


LOC- 


SPE- 


WATER 




METRIC 




DIS- 




SUSP. 






SAMPLE 


ATION, 


CIFIC 


WHOLE 




PRES- 




SOLVED 


SEDI- 


SIEVE 






LOC- 


CROSS 


CON- 


FIELD 


TEMPER- 


SURE 


OXYGEN , 


(PER- 


MENT, 


DIAM. 






ATION , 


SECTION 


DUCT- 


(STAND- 


ATURE 


(^M 


DIS- 


CENT 


SUS- 


Z FINER 


DATE 


TIME 


TOTAL 


(FT FM 


ANCE 


ARD 


WATER 


OF 


SOLVED 


SATUR- 


PENDED 


THAN 






(FEET) 


L BANK) 


(US/CM) 


UNITS) 


(DEG C) 


HG) 


(MG/L) 


ATION) 


(MG/L) 


.062 m 


MAR 
























18...* 


1509 


4.40 


57.0 


248 


7.9 


15.0 


767 


9.7 


96 


48 


98 


18...* 


1514 


5.30 


48.0 


252 


7.9 


15.0 


767 


9.6 


95 


45 


100 


18...* 


1519 


5.10 


36.0 


249 


7.9 


15.0 


767 


9.7 


96 


44 


100 


18...* 


1524 


5.40 


26.0 


248 


7.8 


15.0 


767 


9.7 


96 


46 


100 


18...* 


1529 


5.10 


13.0 


248 


7.8 


15.0 


767 


9.7 


96 


44 


100 


* Instantaneous 


strearaflow 


at the time of cross-sectional measurement: 


Mar. 18 


463 ft^/ 


s 





PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR CCTOBER 1992 TO SEPTEMBER 1993 







DIS- 








SEDI- 


SED. 






CHARGE, 








MENT, 


SUSP. 






INST. 




SEDI 


- 


DIS- 


SIEVE 






CUBIC 


TEMPER- 


MENl 


, 


CHARGE, 


DIAM. 






FEET 


ATURE 


SUS- 




SUS- 


Z FINER 


DATE 


TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 






SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.062 »1 


NOV 
















18... 


1115 


2.7 


10.5 




2 


0.02 


85 


JAN 
















27. .. 


1430 


617 


10.5 




26 


43 


98 


MAR 
















18... 


1200 


491 


14,5 




37 


49 


96 


18... 


1510 


463 


15.0 




45 


56 


100 


MAY 
















25. .. 


1115 


44 


17.5 




6 


0.71 


97 


JUL 
















13... 


1130 


6.4 


20.0 




8 


0.14 


92 


SEP 
















22... 


1130 


2.3 


15.5 




8 


0.05 


80 



216 



NOVATO CREEK BASIN 
11459500 NOVATO CREEK AT NOVATO, CA 



LOCATION. --Lat 38*06'28", long 122"34'4*", In Novate Grant, Marin County, Hydrologlc Unit 18050002, on left bank 
In Novato, 100 ft upstream from 7th Street Bridge, and 3 . 9 ml downstream from Novato Creek Dam. 

DRAINAGE AREA. --17. 6 mi^. 

PERIOD OF RECORD. --October 1946 to current year. Prior to October 1966, published as "near Novato." 

GAGE. — Water-stage recorder. Datum of gage Is 14.76 ft above sea level. Prior to Aug. 23, 1967, at site 0.6 ml 
upstream at different datum. 

RIMARKS. --No estimated dally discharges. Records fair. Flow regulated by Stafford Lake beginning Dec. 1, 1951, 
capacity, 4,500 acre-ft since Oct. 18, 1954; contents, 2,110 acre-ft, Sept. 30, 1992. Diversion from Stafford 
Lake for mxinlcipal water aupply began Apr. 25, 1952, and amounted to 2,124 acre-ft for the current year. No 
diversion from Russian River into Stafford Lake during the current year. 

COOPERATION. --Records of diversions. and storage were provided by North Marin Water District. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 5,000 ft^/s, Jan. 4, 1982, gage height, 14.52 ft; no flow for 
many days In most years. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 1,120 ft^/s, Feb. 22, gage height, 9.09 ft; no flow for several 
days. 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APE 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.34 


1.0 


.00 


84 


21 


60 




8.7 


1.6 


1.2 


.87 


.82 


.33 


2 


.44 


.84 


2.6 


17 


19 


49 




7.5 


1.5 


1.0 


.83 


.67 


.27 


3 


.33 


.70 


2.0 


10 


17 


43 




6.5 


3.1 


.98 


.58 


.73 


.30 


4 


.15 


.57 


.17 


7.9 


14 


35 




6.2 


1.4 


4.7 


.67 


.68 


.22 


s 


.08 


.34 


.09 


7.2 


18 


30 




5.4 


1.2 


1.4 


.69 


.67 


.20 


6 


.15 


.43 


35 


60 


14 


26 




4.5 


1.2 


1.0 


.77 


.55 


.30 


7 


.17 


.28 


3.2 


100 


35 


22 




4.2 


1.3 


.93 


.75 


.51 


.28 


8 


.93 


.21 


12 


32 


76 


20 




4.2 


1.3 


1.1 


.63 


.49 


.21 


9 


.41 


.16 


31 


19 


36 


17 




4.4 


1.3 


.93 


.66 


.42 


.17 


10 


.09 


.08 


48 


16 


35 


15 




4.0 


1.3 


.87 


.63 


.37 


.18 


11 


.01 


.05 


20 


11 


47 


12 




3.5 


1.4 


1.1 


.68 


.37 


.21 


12 


.03 


.05 


7.7 


61 


36 


10 




3.1 


1.5 


.89 


.67 


.39 


.24 


13 


.10 


.05 


4.5 


404 


33 


9. 


2 


3.0 


1.4 


.90 


.80 


.38 


.21 


14 


.12 


.02 


3.4 


154 


30 


8. 


4 


3.1 


1.2 


.84 


.68 


.40 


.24 


15 


.11 


.01 


2.9 


171 


28 


7. 


7 


2.8 


.31 


1.1 


.67 


.41 


.26 


16 


.13 


.03 


2.6 


107 


26 


13 




2.5 


1.2 


1.0 


.73 


.38 


.26 


17 


.10 


.02 


3.0 


158 


102 


17 




7.4 


1.2 


1.0 


.70 


.33 


.21 


18 


.04 


.00 


2.3 


129 


202 


17 




5.0 


1.2 


.94 


.68 


.29 


.22 


19 


.13 


.00 


2.2 


97 


269 


13 




3.7 


1.3 


.90 


.70 


.29 


.19 


20 


2.1 


.01 


2.0 


431 


176 


12 




2.9 


1.2 


.92 


.71 


.37 


.16 


21 


2.0 


.00 


2.2 


370 


135 


11 




2.8 


1.2 


1.0 


.73 


.32 


.10 


22 


.37 


.24 


2.6 


271 


161 


8. 


6 


3.0 


1.2 


.95 


.69 


.26 


.21 


23 


.31 


.03 


2.4 


180 


302 


10 




2.8 


1.2 


.94 


.75 


.22 


.10 


24 


.30 


.02 


2.3 


128 


181 


9. 


8 


2.4 


3.1 


.93 


.77 


.24 


.07 


2S 


.31 


.00 


2.2 


95 


138 


8. 


7 


2.3 


1.5 


.91 


.79 


.29 


.04 


26 


.41 


.00 


2.1 


70 


109 


8, 





2,3 


5.5 


.93 


.80 


.19 


.02 


27 


.31 


.00 


2.1 


54 


88 


10 




2.9 


1.7 


.88 


.83 


.14 


.01 


28 


.35 


.00 


37 


42 


72 


9. 


2 


3.5 


1.1 


1.4 


.79 


.14 


.01 


29 


21 


.00 


39 


34 





8. 





3.3 


.96 


1.1 


.80 


.33 


.00 


30 


2.6 


.00 


14 


28 





7. 





2.9 


2.1 


.89 


.74 


.39 


.00 


31 


1.2 





18 


24 





8. 


5 





2.4 





.66 


.41 





TOTAL 


35.12 


5.14 


308.56 


3372.1 


2420 


535. 


1 


120.8 


49.07 


33.63 


22.45 


12.47 


5.22 


MEAN 


1.13 


.17 


9.95 


109 


86.4 


17. 


3 


4.03 


1.58 


1.12 


.72 


.40 


.17 


MAX 


21 


1.0 


48 


431 


302 


60 


8.7 


5.5 


4.7 


.87 


.82 


.33 


MIN 


.01 


.00 


.00 


7.2 


14 


7. 





2.3 


.31 


.84 


.58 


.14 


.00 


AC-FT 


70 


10 


612 


6690 


4800 


1060 


240 


97 


67 


45 


25 


10 



NOVATO CREEK BASIN 



217 



11459500 NOVATO CREEK AT NOVATO, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1947 - 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

.76 
9.07 
1963 
.000 
1947 



NOV 

3.24 
17.2 
1974 
.000 
1948 



SU^«ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-PT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



DEC 

15.6 
117 
1956 
.000 
1950 



JAN 

45.4 
189 

1970 
.26 

1948 



FEB 

41.9 
239 

1986 
.35 

1948 



FOR 1992 CALENDAR YEAR 

1966.21 
5.37 



178 Mar 5 
.00 Jun 17 
.00 Jul 4 



3900 
13 



.49 
.00 



1993. BY WATER YEAR (WY) 

MAR APR MAY JUN 



24.5 
207 

1983 
.84 

1976 



9.60 
81.3 
1958 
.17 
1977 



1.41 
12.9 
1983 
.016 
1961 



FOR 1993 WATER YEAR 

6919.66 
19.0 



431 
.00 
.00 
1120 
9.09 
13730 
45 
1.2 
.10 



Jan 20 
Nov 18 
Nov 25 
Feb 22 
Feb 22 



.70 
7.73 
1980 
.000 
1951 



JUL 

.62 
8.61 
1980 
.000 
1947 



AUG 

.37 
8.53 
1980 
.000 
1947 



SEP 

.30 
5.40 
1967 
.000 
1947 



WATER YEARS 1947 - 1993 



11.9 








47.9 






1983 


.40 






1976 


2850 


Jan 




1982 


.00 


Oct 




1946 


.00 


Oct 




1946 


5000 


Jan 




1982 


14.52 


Jan 




1982 


8620 








21 








.55 








.00 









218 



CORTE MADERA CREEK BASIN 
11460000 CORTE MADERA CREEK AT ROSS, CA 



LOCATION. --Lat 37'57'45", long 122*33'20", in Punta de Quentin Grant, Marin County, Hydrologlc Unit 18050002, on 
left bank behind fire station at Ross, 1.7 mi southwest of San Rafael, 1.7 mi below Phoenix Lake, and 4 ml 
upstream from mouth. 

DRAINAGE AREA. — 18.1 mi^. 

PERIOD OF RECORD. — February 1951 to Septeaiber 1993 (discontinued). 

REVISED RECORDS. --WDR CA-85-2: 1982(M). 

GAGE. --Water-stage recorder. Datum of gage is 7.97 ft above sea level (levels by U.S. Amy Corps of Engineers). 

REMARKS. --No estimated daily discharges. Records poor. Flow slightly regulated by Phoenix Lake, capacity 
612 acre-ft. Diversion on tributary upstream from station by Marin Municipal Water District. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 7,200 ft'/s, Jan. 4. 1982. gage height, 19.81 ft, from rating 
curve extended above 2,700 ft /s; no flow at times. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,000 ft^/s and maximum (*) 

Discharge Gage height 
Date Time (ft^/a) (ft) 



Jan. 


6 


2345 


1,760 


13.23 


Jan. 


13 


0415 


2,710 


15.89 



Date 



Jan. 20 
Feb. 19 



Time 



1630 
0300 



Discharge Gage height 
(ft^/8) (ft) 



*3,350 
1,330 



*17.04 
11.69 



No flow for many days . 



DISCHARGE. 



DAY 



OCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


.00 


.26 


.48 


319 


18 


35 




14 


3.0 


2.2 


.97 


.17 


.00 


2 


.00 


.17 


7.1 


82 


17 


28 




10 


3.0 


2.1 


.85 


.32 


.00 


3 


.00 


.12 


8.1 


41 


16 


30 




8.8 


3.3 


2.0 


.87 


2.7 


.00 


4 


.00 


.11 


.60 


26 


15 


21 




7.8 


3.0 


14 


.67 


.19 


.00 


S 


.00 


.12 


.67 


20 


23 


18 




7.2 


2.9 


7.9 


.58 


.17 


.00 


6 


.00 


.13 


68 


256 


17 


17 




6.7 


2.8 


6.3 


.50 


.18 


.00 


7 


.00 


.14 


8.9 


516 


58 


14 




6.4 


2.9 


6.0 


.49 


.19 


.00 


8 


.00 


.18 


120 


164 


165 


13 




6.2 


2.7 


5.6 


.49 


.18 


.00 


9 


.00 


.18 


302 


86 


76 


12 




6.1 


2.6 


5.1 


.49 


.13 


.00 


10 


.00 


.18 


232 


54 


67 


10 




5.6 


2.5 


4.8 


.47 


.11 


.00 


11 


.00 


.19 


85 


35 


84 


9. 


8 


5.3 


2.5 


4.4 


.46 


.16 


.00 


12 


.00 


.21 


23 


163 


57 


9. 


1 


4.9 


2.5 


4.2 


.45 


.17 


.00 


13 


.00 


.22 


9.6 


1580 


45 


8. 


7 


4.7 


2.5 


4.0 


.44 


.19 


.00 


14 


.00 


.26 


7.4 


444 


36 


8. 


2 


4.6 


2.5 


3.8 


.42 


.20 


.00 


IS 


.00 


.32 


5.8 


510 


29 


8. 





4.4 


2.6 


3.6 


.43 


.20 


.00 


16 


.00 


.36 


6.2 


309 


25 


14 




4.0 


2.5 


3.4 


.43 


.19 


.00 


17 


.00 


.38 


5.3 


281 


290 


46 




16 


2.5 


3.1 


.42 


.15 


.00 


18 


.00 


.35 


2.2 


179 


370 


28 




6.6 


2.5 


2.8 


.40 


.10 


.00 


19 


.00 


.41 


1.8 


92 


626 


19 




5.2 


2.4 


2.5 


.42 


.10 


.00 


20 


.02 


.37 


1.6 


1470 


292 


15 




4.5 


2.4 


2.4 


.40 


.10 


.00 


21 


.04 


.34 


1.5 


488 


156 


13 




4.1 


2.3 


2.3 


.43 


.09 


.00 


22 


.00 


.59 


1.4 


230 


202 


11 




3.9 


2.2 


2.2 


.41 


.08 


.00 


23 


.00 


.33 


1.5 


130 


408 


15 




4.1 


2.1 


1.9 


.43 


.05 


.00 


24 


.00 


.30 


1.6 


88 


197 


13 




4.1 


4.9 


1.6 


.39 


.01 


.00 


2S 


.00 


.31 


1.6 


61 


122 


11 




3.8 


2.7 


1.4 


.41 


.00 


.00 


26 


.00 


.32 


1.5 


47 


87 


9. 


5 


3.6 


4.7 


1.3 


.43 


.00 


.00 


27 


.00 


.33 


2.0 


37 


64 


23 




3.6 


2.6 


1.3 


.42 


.00 


.00 


28 


.00 


.36 


215 


30 


46 


17 




3.4 


2.2 


1.2 


.41 


.00 


.00 


29 


44 


.39 


122 


26 





12 




3.3 


2.1 


1.1 


.41 


.00 


.00 


30 


.64 


.43 


52 


23 





11 




3.1 


2.6 


.97 


.36 


.00 


.00 


31 


.29 





52 


20 





14 







3.3 





.28 


.00 


— 


TOTAL 


44.99 


8.36 


1347.85 


7807 


3608 


513. 


3 


176.1 


85.3 


105.47 


15.03 


6.13 


0.00 


MEAN 


1.45 


.28 


43.5 


252 


129 


16. 


6 


5.87 


2.75 


3.52 


.48 


.20 


.000 


MAX 


44 


.59 


302 


1580 


626 


46 


16 


4.9 


14 


.97 


2.7 


.00 


MIN 


.00 


.11 


.48 


20 


15 


8, 





3.1 


2.1 


.97 


.28 


.00 


.00 


AC -FT 


89 


17 


2670 


15490 


7160 


1020 


349 


169 


209 


30 


12 


.00 



CORTE MADERA CREEK BASIN 



219 



IKiBOOOO CORTE MADERA CREEK AT ROSS. CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1993. BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 3.10 16.9 


52.0 


89.5 


85.2 


53.6 


21.0 


4.37 


1.65 


.64 


.35 




.52 


MAX 39.5 135 


293 


338 


410 


344 


153 


24.7 


10.7 


2.98 


1.45 




3.73 


(WY) 1963 197* 


1956 


1970 


1986 


1983 


1958 


1957 


1967 


1967 


1958 




1959 


MIN .001 .043 


.46 


.22 


1.62 


2.25 


1.71 


.68 


.12 


.002 


.000 




.000 


(WY) 1991 1991 


1991 


1991 


1977 


1988 


1990 


1977 


1977 


1977 


1977 




1988 


SUM1ARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




HATER YEARS 1951 




1993 


ANNUAL TOTAL 




5686.15 






13717.53 














ANNUAL MEAN 




15.5 






37.6 






27.2 








HIGHEST ANNUAL MEAN 
















77.0 






1983 


LOWEST ANNUAL MEAN 
















1.25 






1977 


HIGHEST DAILY MEAN 




527 


Feb 19 




1580 


Jan 13 




3840 


Jan 


4 


1982 


LOWEST DAILY MEAN 




.00 


Aug 7 




.00 


Oct 1 




.00 


Jul 


20 


1956 


ANNUAL SEVEN-DAY MINIMUM 




.00 


Aug 7 




.00 


Oct 1 




.00 


Jul 


20 


1956 


INSTANTANEOUS PEAK FLOW 










3350 


Jan 20 




7200 


Jan 


4 


1982 


INSTANTANEOUS PEAK STAGE 










17.04 


Jan 20 




19.81 


Jan 


4 


1982 


ANNUAL RUNOFF (AC-FT) 




11280 






27210 






19700 








10 PERCENT EXCEEDS 




27 






83 






51 








50 PERCENT EXCEEDS 




.59 






2.4 






1.9 








90 PERCENT EXCEEDS 




.00 






.00 






.10 









220 



LAGUNITAS CREEK BASIN 
lliieOAOO LAGUNITAS CREEK AT SAMUEL P. TAYLOR STATE PARK, CA 



LOCATION. --Lat 38*01'37", long IZZ'AA ' 07" , Marin County. Hydrologlc Unit 18050005, In Samuel P. Taylor State 
Park, on left bank 300 ft upstream from Deadman's Gulch, 0.9 ml downstream from park entrance, 2.1 ml 
northwest of Lagunitas, and 3. A ml downstream from Kent Lake. 

DRAINAGE AREA.--3A.3 mi^. 

PERIOD OF RECORD. — December 1982 to current year. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage Is 102.89 ft above sea level. 

REMARKS. --No estimated daily discharges. Records good. Flow regulated by Kent Lake, capacity, 16,680 acre-ft, 
and Alpine Lake, capacity, 8,890 acre-ft, both of which divert for domestic and industrial use in Marin 
County . 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 3,A70 ft^/s, Feb. 18, 1986, gage height, 8. A* ft; minimum 
daily, 3.8 ft^/s. Oct. 16-18, 1986. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 2,070 ft^/s, Jan, 20, gage height, 7.14 ft; minimum daily, 
*.0 ft^/s, Oct. 7-13. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


4. 


7 


20 


15 


284 


35 


84 


49 


13 




11 


6.4 


5.1 


4.6 


2 


4. 


7 


20 


23 


85 


32 


68 


45 


13 




8.9 


6.6 


5.1 


4.6 


3 


4. 


4 


20 


24 


47 


29 


69 


41 


13 




9.3 


6.7 


5.1 


4.6 


4 


4. 


2 


19 


22 


33 


27 


58 


39 


13 




13 


6.7 


5.1 


4.6 


5 


4. 


2 


19 


21 


26 


35 


47 


35 


12 




15 


6.4 


5.1 


4.6 


6 


4. 


1 


19 


75 


106 


30 


43 


31 


12 




13 


6.8 


5.0 


4.6 


7 


4. 





19 


40 


347 


34 


38 


29 


12 




12 


6.8 


5.1 


4.6 


B 


4. 





19 


98 


135 


99 


34 


27 


12 




11 


6.8 


5.1 


4.6 


8 


4. 





19 


333 


80 


115 


31 


26 


12 




11 


6.9 


5.1 


4.6 


10 


4. 





19 


291 


58 


113 


28 


23 


13 




10 


6.7 


5.1 


4.6 


11 


4. 





19 


130 


43 


166 


27 


22 


13 




9.5 


6.6 


5.1 


4.6 


12 


4. 





19 


56 


56 


135 


26 


22 


13 




9.2 


6.8 


5.1 


4.6 


13 


4. 





19 


34 


903 


109 


22 


21 


13 




8.8 


7.4 


5.1 


4.4 


U 


6. 


3 


19 


25 


308 


89 


20 


21 


11 




8.5 


6.9 


5.1 


4.5 


IS 


10 




19 


22 


258 


73 


21 


20 


9. 


3 


8.2 


6.7 


5.1 


4.8 


16 


12 




19 


22 


203 


60 


26 


20 


9. 


3 


8.2 


6.7 


5.1 


4.7 


17 


12 




19 


24 


178 


174 


56 


44 


9. 


2 


8.1 


6.7 


5.1 


4.6 


IB 


12 




19 


22 


157 


412 


70 


35 


8. 


9 


7.8 


6.7 


5.1 


4.6 


19 


15 




19 


20 


97 


675 


77 


28 


9. 


6 


7.6 


6.7 


5.7 


4.7 


20 


IB 




20 


19 


1240 


550 


72 


25 


9. 


9 


7.6 


6.7 


5.2 


4.7 


21 


IS 




20 


23 


868 


334 


61 


22 


9. 


5 


7.4 


6.7 


5.1 


4.6 


22 


19 




20 


27 


618 


250 


52 


20 


9. 


1 


7.5 


6.4 


5.0 


4.6 


23 


21 




20 


26 


402 


585 


52 


19 


8. 


6 


7.3 


6.0 


4.8 


4.6 


24 


22 




IB 


26 


261 


420 


60 


19 


10 




6.9 


5.7 


4.6 


4.6 


2S 


22 




IB 


26 


184 


284 


51 


18 


11 




6.6 


5.6 


4.5 


4.6 


26 


22 




IS 


26 


140 


200 


44 


16 


11 




6.6 


5.6 


4.5 


4.7 


27 


22 




IB 


26 


105 


142 


44 


16 


12 




6.5 


5.4 


4.6 


4.9 


28 


22 




17 


147 


68 


107 


47 


15 


11 




6.0 


5.2 


4.5 


4.9 


29 


SO 




11 


92 


49 





44 


15 


11 




6.5 


5.3 


4.4 


4.8 


30 


19 




9.1 


51 


42 





40 


14 


11 




6.5 


5.7 


4.6 


4.6 


31 


20 







51 


38 





41 





14 







5.3 


4.6 





TOTAL 


393. 


6 


550.1 


1837 


7419 


5314 


1453 


777 


349. 


4 


265.5 


197.6 


153.8 


139.1 


MEAN 


12. 


7 


18.3 


59.3 


239 


190 


46.9 


25.9 


11. 


3 


8.85 


6.37 


4.96 


4.64 


MAX 


50 


20 


333 


1240 


675 


84 


49 


14 


15 


7.4 


5.7 


4.9 


MIN 


4. 





9.1 


15 


26 


27 


20 


14 


8. 


6 


6.0 


5.2 


4.4 


4.4 


AC-FT 


781 


1090 


3640 


14720 


10540 


2880 


1540 


693 


527 


392 


305 


276 



LAGUNITAS CREEK BASIN 



221 



11460400 LAGUNITAS CREEK AT SAMUEL P. TAYLOR STATE PARK, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


7.49 


21.5 


42.6 


65.1 


121 


107 


19.2 


14.4 


8.04 


6.37 


5.51 


5.43 


MAX 


13.4 


66.3 


173 


239 


421 


503 


67.3 


40.7 


10.3 


7.61 


7.05 


6.53 


(W) 


1990 


19BS 


1984 


1993 


1986 


1983 


1983 


1983 


1990 


1991 


1991 


1991 


HIN 


4.34 


4.74 


6.84 


14. S 


11.2 


13.6 


8.39 


7.43 


6.30 


4.92 


4.44 


4.29 


(Hlf) 


1987 


1987 


1987 


1991 


1989 


1988 


1987 


1987 


1987 


1992 


1984 


1984 



SUmARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1983 - 1993 



1685.5 






18849.1 








26.5 






51.6 




28.0 
65.2 
14.7 


1986 
1987 


460 


Feb 


19 


1240 


Jan 20 


2350 


Feb 17 1986 


4.0 


Oct 


7 


4.0 


Oct 7 


3.8 


Oct 16 1986 


4.0 


Oct 


7 


4.0 


Oct 7 


4.0 


Oct 16 1986 








2070 


Jan 20 


3470 


Feb 18 1986 








7.14 


Jan 20 


8.44 


Feb 18 1986 


1210 






37390 




20270 




45 






108 




51 




16 






17 




9.9 




4.6 






4.6 




S.O 





222 



LAGUNITAS CREEK BASIN 
11460600 LAGUNITAS CREEK NEAR POINT REYES STATION, CA 



LOCATION. --Lat 38*0«'*9", long 122*'.7'00" , in Nlcaslo (Black) Grant. Marin County, Hydrologic Unit 18050005, on 
right bank at upstream side of road bridge, 300 ft downstream from small right-bank tributary, 1.4 mi north- 
east of town of Point Reyes Station, and 2.5 ml downstream from Nicasio Dam. 

DRAINAGE AREA. --81. 7 mi^. 

PERIOD OF RECORD. — October 1974 to current year. 

WATER TEMPERATURE: October 1989 to September 1990. 
SEDIMENT DATA: October 1989 to September 1990. 

REVISED RECORDS. --WDR CA-79-2: 1975, 1978. WDR CA-82-2: 1975(M), 1978(M), 1980(M). 

GAGE. — Water-stage recorder and crest-stage gage. Elevation of gage is 50 ft above sea level, from topographic 
map. 

REMARKS. --No estimated daily discharges. Records good. Flow regulated by Nicasio Reservoir, capacity, 

22,450 acre-ft; Kent Lake, capacity, 16,680 acre-ft; and Alpine Lake, capacity, 8,890 acre-ft, all of which 
divert water for domestic and industrial use in Marin County. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 22,100 ft'/s, Jan. 4, 1982, gage height, 26.96 ft, from rating 
curve extended above 6,200 ft /s on basis of slope-area measurement of peak flow; minimum daily, 0.01 ft /s, 
Sept. 26, 1977. 



EXTREMES FOR CURRENT YEAR. --Maximum discharge, 7,700 ft^/s, Jan. 
4.7 ft^/s, Sept. 21, 22, 24-26. 



20, gage height, 19.53 ft; minimum daily. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 


OCT 


NOV 


DEC 


JAN 


FEB 


MAR 


APR 


MAY 


JUN 


JUL 


AUG 


SEP 


1 


5.2 


22 


21 


451 


74 


183 


92 


19 


15 


7.8 


6.1 


5.2 


2 


5.7 


21 


24 


154 


68 


150 


78 


18 


11 


7.9 


5.9 


5.2 


3 


5.5 


21 


27 


84 


62 


147 


70 


19 


10 


7.9 


5.9 


5.2 


4 


5.3 


20 


24 


58 


57 


125 


66 


18 


12 


7.9 


5.9 


5.3 


S 


5.3 


20 


22 


47 


71 


103 


58 


17 


18 


7.6 


6.1 


5.2 


6 


5.3 


20 


66 


95 


65 


91 


51 


17 


15 


7.6 


6.2 


5.2 


7 


5.2 


20 


62 


634 


66 


79 


47 


16 


14 


7.5 


6.3 


5.2 


8 


5.2 


20 


49 


465 


219 


70 


44 


16 


13 


7.3 


6.4 


5.1 


9 


5.3 


20 


459 


319 


241 


61 


45 


16 


12 


7.5 


6.1 


5.0 


10 


5.3 


20 


439 


234 


223 


55 


39 


16 


12 


7.3 


6.1 


5.2 


11 


5.1 


20 


240 


159 


339 


52 


35 


16 


11 


7.2 


6.1 


5.3 


12 


5.3 


20 


92 


153 


273 


50 


32 


17 


11 


7.0 


6.1 


5.2 


13 


5.3 


20 


52 


3820 


219 


45 


29 


16 


10 


7.3 


5.8 


5.2 


14 


5.3 


20 


35 


1750 


181 


40 


28 


16 


9.9 


7.5 


5.9 


5.2 


15 


8.5 


20 


26 


887 


149 


38 


27 


13 


10 


7.2 


5.9 


5.2 


16 


10 


20 


26 


980 


125 


44 


26 


13 


9.8 


6.9 


5.9 


5.3 


17 


11 


20 


27 


721 


395 


125 


69 


12 


9.6 


7.0 


5.9 


5.1 


18 


11 


20 


25 


674 


1170 


138 


75 


12 


9.3 


6.9 


5.6 


4.9 


10 


11 


21 


22 


396 


1630 


130 


51 


13 


8.9 


6.7 


5.8 


4.8 


20 


17 


21 


20 


4450 


1300 


115 


41 


13 


8.8 


6.7 


6.3 


4.8 


21 


14 


21 


21 


2530 


733 


98 


36 


13 


8.8 


6.7 


5.7 


4.7 


22 


17 


21 


27 


1330 


537 


83 


31 


12 


8.6 


6.7 


5.6 


4.7 


23 


19 


21 


26 


789 


1810 


85 


28 


12 


8.6 


6.9 


5.4 


4.8 


24 


19 


21 


26 


503 


1010 


113 


31 


13 


8.5 


6.8 


5.4 


4.7 


2S 


19 


21 


25 


354 


617 


94 


27 


15 


8.4 


6.6 


5.3 


4.7 


28 


20 


21 


25 


270 


420 


76 


24 


14 


8.3 


7.0 


5.2 


4.7 


27 


20 


21 


24 


208 


303 


77 


22 


15 


8.2 


6.8 


5.2 


4.9 


28 


20 


21 


154 


154 


231 


85 


21 


14 


7.6 


6.4 


5.0 


4.9 


29 


S3 


21 


147 


119 





76 


21 


13 


7.8 


6.5 


5.0 


4.9 


30 


26 


21 


81 


99 





67 


20 


13 


7.9 


6.4 


5.2 


4.9 


31 


22 





65 


81 





65 





17 





6.8 


5.2 





TOTAL 


391.8 


616 


2379 


22968 


12588 


2760 


1264 


464 


313.0 


220.3 


178.5 


150.7 


MEAN 


12.6 


20.5 


76.7 


741 


450 


89.0 


42,1 


15.0 


10.4 


7.11 


5.76 


5.02 


MAX 


S3 


22 


459 


4450 


1810 


183 


92 


19 


18 


7.9 


6.4 


5.3 


MIN 


5.1 


20 


20 


47 


57 


38 


20 


12 


7.6 


6.4 


5.0 


4.7 


AC-FT 


777 


1220 


4720 


45560 


24970 


5470 


2510 


920 


621 


437 


354 


299 



LAGUNITAS CREEK BASIN 



223 



11*60600 LAGUNITAS CREEK NEAR POINT REYES STATION, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN JUL 



AUG 



SEP 



MEAN 6.62 38.4 


95.0 


209 


279 


212 


61.3 


15.1 


6.55 


5.05 


4 


.34 




4.07 


MAX 19.2 177 


542 


991 


1193 


1109 


531 


86.4 


14.1 


8.68 


6 


.95 




6.34 


(WY) 1984 1983 


1984 


1982 


1986 


1983 


1982 


1983 


1983 


1983 


1991 




1991 


MIN .19 1.35 


1.51 


2.37 


3.52 


7.40 


1.59 


.67 


.45 


1.77 


1 


.47 




1.12 


(WY) 1977 1977 


1977 


1976 


1977 


1977 


1977 


1977 


1977 


1976 


1976 




1977 


SU^t1ARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




WATER YEARS 


1975 


- 


1993 


ANNUAL TOTAL 




14114.8 






44293.3 
















ANNUAL MEAN 




38.6 






121 






77.1 










HIGHEST ANNUAL MEAN 
















269 








1983 


LOWEST ANNUAL MEAN 
















2.54 








1977 


HIGHEST DAILY MEAN 




895 


Feb 20 




4450 


Jan 20 




10700 




Jan 


4 


1982 


LOWEST DAILY MEAN 




4.9 


Sep 27 




4.7 


Sep 21 




.01 




Sep 


26 


1977 


ANNUAL SEVEN-DAY MINIMUM 




5.0 


Sep 25 




4.7 


Sep 20 




.02 




Oct 


14 


1977 


INSTANTANEOUS PEAK FLOW 










7700 


Jan 20 




22100 




Jan 


4 


1982 


INSTANTANEOUS PEAK STAGE 










19.53 


Jan 20 




26.96 




Jan 


4 


1982 


ANNUAL RUNOFF (AC-FT) 




28000 






87860 






55850 










10 PERCENT EXCEEDS 




76 






232 






125 










50 PERCENT EXCEEDS 




20 






20 






8.0 










90 PERCENT EXCEEDS 




5.3 






5.2 






2.2 











224 



WALKER CREEK BASIN 
11'.60750 WALKER CREEK NEAR MARSHALL, CA 



LOCATION. --Lat 38*10'33", long 122*'i9'02", in Soulajule (Vasquez) Grant, Marin County, Hydrologlc Unit 18050005, 
on right bemk 0.8 mi downstream £rom Verde Canyon, 2.8 mi below confluence of Arroyo Sausal and Salmon Creek, 
and 4.0 mi east of Marshall. 

DRAINAGE AREA. --31. 1 mi^. 

PERIOD OF RECORD. --October 1983 to current year. 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage is 140 ft above sea level, from topographic 
map. 

REMARKS. --Records fair. Flow affected by regulation and diversions and by Soulajule Reservoir on Arroyo Sausal; 
reservoir capacity, 10,570 acre-ft. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 7,050 ft^/s, Feb. 17, 1986, gage height, 10.79 ft, from rating 
curve extended above 1,100 ft /s on basis of comparison with discontinued downstream station Walker Creek near 
Tomales; minimum daily, 0.73 ft^/s, Nov. 26, 1991. 

EXTREMES OUTSIDE OF PERIOD OF RECORD. --Flood of Jan. 4, 1982, reached a stage of 15.9 ft, present datum, from 
floodmarks, discharge, 14,600 ft /s. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 5,060 ft^/s, Jan. 20, gage height, 9.34 ft; minimum dally, 
3.9 ft^/s, Sept. 30. 



DAY 



OCT 



DISCHARGE, 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 




S.l 


4. 


6 


362 


22 


52 


28 


6.4 


5.2 


4.2 


4.0 


4.0 


2 




4.8 


5. 


1 


76 


20 


44 


23 


6.3 


5.0 


4.2 


4.0 


4.0 


3 




4.7 


5. 


1 


41 


18 


47 


19 


6.5 


4.8 


4.2 


4.0 


4.0 


4 




4.6 


4. 


7 


33 


16 


37 


18 


6.4 


5.5 


4.2 


4.0 


4.0 


S 




4.6 


4. 


6 


28 


21 


32 


16 


6.3 


5.4 


4.2 


4.0 


4.0 


6 




4.6 


7. 


1 


104 


19 


27 


15 


6.2 


5.1 


4.2 


4.0 


4.0 


7 




4.6 


5. 


6 


321 


19 


24 


14 


6.1 


5.0 


4.3 


4.0 


4.0 


8 




4.6 


8. 


5 


119 


70 


22 


14 


6.0 


4.7 


4.2 


4.0 


4.0 


9 




4.6 


41 




63 


73 


21 


14 


6.0 


4.6 


4.2 


4.0 


4.0 


10 




4.6 


128 




46 


58 


19 


12 


5.9 


4.6 


4.2 


4.0 


4.0 


11 




4.6 


76 




34 


178 


18 


12 


5.7 


4.6 


4.2 


4.0 


4.0 


12 




4.6 


39 




121 


113 


18 


11 


5.7 


4.6 


4.2 


4.0 


4.0 


13 




4.4 


22 




2430 


74 


17 


11 


5.7 


4.6 


4.2 


4.0 


4.0 


14 




4.4 


17 




916 


56 


16 


11 


5.7 


4.6 


4.2 


4.0 


4.0 


IS 




4.4 


17 




461 


44 


16 


11 


5.7 


4.4 


4.0 


4.0 


4.0 


16 




4.4 


16 




438 


38 


17 


10 


5.7 


4.4 


4.0 


4.0 


4.0 


17 




4.4 


17 




364 


184 


36 


13 


5.7 


4.4 


4.0 


4.0 


4.0 


18 




4.4 


15 




348 


470 


48 


12 


5.7 


4.4 


4.0 


4.0 


4.0 


19 




4.4 


15 




215 


650 


41 


11 


5.7 


4.4 


4.0 


4.0 


4.0 


20 




4.4 


14 




2480 


472 


32 


10 


5.0 


4.4 


4.0 


4.0 


4.0 


21 




4.4 


14 




1140 


282 


27 


10 


4.8 


4.4 


4.0 


4.0 


4.0 


22 




4.6 


14 




531 


274 


23 


9.6 


4.8 


4.2 


4.0 


4.0 


4.0 


23 


4.9 


4.6 


13 




290 


1030 


29 


9.8 


4.8 


4.2 


4.0 


4.0 


4.0 


24 


4.8 


4.6 


13 




170 


304 


42 


10 


5.2 


4.2 


4.0 


4.0 


4.0 


2S 


4.8 


4.6 


13 




110 


160 


34 


9.2 


5.2 


4.2 


4.0 


4.0 


4.0 


26 


4.8 


4.6 


13 




78 


107 


29 


9.1 


5.5 


4.2 


4.0 


4.0 


4.0 


27 


4.8 


4.6 


13 




55 


77 


29 


9.3 


5.4 


4.2 


4.0 


4.0 


4.0 


28 


4.8 


4.6 


25 




43 


62 


33 


9.3 


5.1 


4.2 


4.0 


4.0 


e4.0 


29 


9.9 


4.6 


49 




36 





28 


9.3 


5.0 


4.2 


4.0 


4.0 


e4.0 


30 


5.2 


4.6 


58 




29 





24 


7.9 


4.9 


4.2 


4.0 


4.0 


e3.9 


31 


4.8 





50 




24 





24 





5.6 





4.0 


4.0 





TOTAL 


160.7 


137.0 


737. 


3 


11506 


4911 


906 


378.7 


174.7 


136.9 


126.9 


124.0 


119.9 


MEAN 


5.18 


4.57 


23. 


e 


371 


175 


29.2 


12.6 


5.64 


4.56 


4.09 


4.00 


4.00 


MAX 


9.9 


5.1 


128 


2480 


1030 


52 


28 


6.5 


5.5 


4.3 


4.0 


4.0 


MIN 


4.8 


4.4 


4. 


6 


24 


16 


16 


7.9 


4.8 


4.2 


4.0 


4.0 


3.9 


AC-FT 


319 


272 


1460 


22820 


9740 


1800 


751 


347 


272 


252 


246 


238 


e Estimated. 



























WALKER CREEK BASIN 



225 



H460750 WALKER CREEK NEAR MARSHALL, CA- -Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1984 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


4.64 


11.6 


36.8 


63.3 


99.5 


45.6 


9.06 


5.39 


4.54 


4.38 


4.39 


4.44 


MAX 


6.27 


46.3 


247 


371 


588 


140 


14.1 


6.76 


5.56 


5.80 


5.80 


5.80 


(WY) 


1990 


1984 


1984 


1993 


1986 


1986 


1985 


1984 


1984 


1984 


1984 


1984 


MIN 


1.35 


1.23 


1.85 


1.71 


2.14 


10.4 


5.52 


2.18 


1.90 


1.42 


1.42 


1.22 


(WY) 


1991 


1992 


1991 


1991 


1991 


1988 


1991 


1991 


1991 


1991 


1991 


1991 



SUI*1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1984 



1993 



5304.9 






19419.1 








14.5 






53.2 




24.1 
67.5 
7.41 


1986 
1991 


234 


Feb 


19 


2480 


Jan 20 


4940 


Feb 17 1986 


4.4 


Nov 


13 


3.9 


Sep 30 


.73 


Nov 26 1991 


4.4 


Nov 


13 


4.0 


Sep 24 


.78 


Nov 23 1991 








5060 


Jan 20 


7050 


Feb 17 1986 








9.34 


Jan 20 


10.79 


Feb 17 1986 


10520 






38520 




17460 




29 






73 




29 




5.3 






5.1 




5.5 




4.6 






4.0 




2.2 





226 



RUSSIAN RIVER BASIN 



A 

467000 



EXPLANATION 

Gaging station and abbreviated number 
(Connplete number as given in the 
station description of report is 
11467000) 

Stream, open flume, or canal showing 
direction of flow 



Diversion from 



471099 Eel River 



461000 



Lake Sonoma 

380,600 acre-feet 

Since 1983 






A 



465000 



Pena Creek 



§ 



A 



465200 



I 



462000 

k—A^ — 



Lake Mendocino 

122,400 acre-feet 

Since 1958 



c 
•S 

I 

i2 



(0 

■"J 
Ul 



Cold Creek 



461500 



A 



462500 



^ 1463000 

s 

CO 

^ 463200 

QC 



^-A- 



Big Sulphur Creek 



■A 



463170 



A 



463980 



464000 



465350 

A ► 



466500 

H-^ 



Laguna De Santa Rosa 



A467000 



Figure 24. Diversions and storage In Russian River basin. 



RUSSIAN RIVER BASIN 
11461000 RUSSIAN RIVER NEAR UKIAH, CA 



227 



LOCATION.— Lat 39'11'44", long 123'11'38", in Yokaya Grant, Mendocino County, Hydrologic Unit 18010110, on right 
bank 20 ft downstream from bridge on Lake Mendocino Drive, 0.4 mi upstream from East Fork, 0.6 mi downstream 
from York Creek, and 3.2 mi north of Uklah. 

DRAINAGE AREA.--100 mi^. 

PERIOD OF RECORD. — August 1911 to September 1913, October 19S2 to current year. Monthly discharge only for some 
periods, published in WSP 1315-B. 
CHEMICAL DATA: Water years 1977-79. 
BIOLOGICAL DATA: Water years 1977-79. 
WATER TEMPERATURE: Water years 1965-68. 
SEDIMENT DATA: Water years 1964-68, 1991-92. 

REVISED RECORDS. — WSP 1929: Drainage area. 

GAGE. — Water-stage recorder. Datum of gage is 599.22 ft above sea level. Prior to October 1952, nonrecording 
gage at bridge 20 ft upstream at different datum. Oct. 1, 1952, to Nov. 8, 1971, water-stage recorder at site 
0.6 mi upstream at different datum. 

REMARKS. — Records fair. No regulation. Diversions upstream from station for irrigation of about 1,000 acres. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 18,900 ft^/s, Dec. 21, 1955, gage height, 19.0 ft, site and 
datum then in use; maximum gage height, 20.87 ft, Jan. 20, 1993; no flow at times in many years. 



EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 4,000 ft /s and maximum (*): 

Discharge Gage height Discharge Gage height 

Date Time (ft^/s) (ft) Date Time (ft^/s) (ft) 



Dec. 


8 


2015 


6,950 


14.88 


Dec. 


31 


1745 


12,600 


18.26 



Jan. 14 
Jan. 20 



0245 
1430 



5,530 
*17,700 



Minimum daily, 0.06 ft'/s, Oct. 11, 12 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



13.81 
*20 . 87 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


3.0 


35 


3.9 


el300 


120 


203 


187 


60 


215 


12 


2.6 


1.3 


2 


6.6 


30 


10 


600 


109 


186 


149 


55 


137 


11 


2.4 


1.1 


3 


2.0 


16 


77 


343 


101 


191 


128 


59 


100 


11 


1.8 


1.1 


4 


.60 


9.7 


45 


259 


94 


157 


137 


63 


100 


10 


1.8 


1.1 


5 


.38 


6.3 


26 


249 


92 


137 


131 


51 


139 


9.8 


2.0 


1.1 


6 


.27 


4.7 


334 


528 


87 


126 


116 


47 


157 


9.4 


1.9 


1.1 


7 


.16 


4.0 


326 


1000 


83 


115 


106 


43 


104 


9.3 


1.6 


1.1 


8 


.12 


3.9 


2150 


549 


125 


106 


139 


40 


82 


7.4 


1.8 


1.1 


9 


.10 


3.6 


eSOO 


566 


121 


98 


153 


38 


70 


7.2 


1.6 


1.1 


10 


.07 


3.4 


e2000 


504 


155 


90 


128 


34 


62 


7.2 


1.7 


1.1 


11 


.06 


3.3 


982 


341 


492 


84 


109 


33 


55 


6.1 


1.8 


1.1 


12 


.06 


3.0 


518 


288 


276 


79 


96 


34 


49 


5.9 


1.8 


1.2 


13 


.09 


2.9 


289 


610 


198 


76 


91 


34 


45 


6.5 


1.7 


1.3 


14 


.38 


2.8 


214 


2090 


164 


79 


83 


33 


40 


6.0 


1.3 


1.5 


IS 


.56 


2.8 


163 


843 


141 


75 


79 


30 


37 


7.2 


1.2 


2.1 


16 


.69 


2.7 


128 


731 


124 


80 


73 


28 


35 


6.6 


1.5 


2.1 


17 


.78 


2.6 


139 


482 


370 


680 


206 


26 


35 


5.1 


1.5 


2.1 


18 


.76 


9.8 


134 


374 


941 


551 


231 


24 


39 


4.3 


2.0 


2.2 


19 


.81 


5.2 


94 


329 


2520 


316 


140 


25 


30 


4.7 


2.5 


2.3 


20 


4.0 


5.1 


126 


9390 


1640 


217 


114 


33 


24 


5.0 


2.5 


1.9 


21 


4.3 


5.5 


121 


e2600 


1160 


170 


101 


31 


23 


4.8 


2.7 


1.5 


22 


l.B 


39 


92 


e2000 


840 


143 


91 


29 


21 


4.5 


2.1 


1.5 


23 


1.3 


40 


76 


938 


1530 


288 


124 


26 


20 


5.1 


1.3 


1.6 


24 


1.0 


21 


64 


610 


786 


635 


172 


26 


19 


5.3 


1.1 


1.8 


25 


.97 


13 


54 


440 


528 


305 


112 


27 


17 


6.0 


1.2 


1.8 


26 


.72 


9.2 


45 


333 


394 


231 


98 


165 


15 


5.4 


1.1 


1.8 


27 


.67 


7.5 


37 


270 


306 


189 


89 


196 


12 


5.8 


1.1 


1.6 


26 


.79 


6.5 


254 


221 


242 


164 


80 


98 


14 


4.1 


1.1 


1.4 


29 


10 


5.4 


844 


188 





137 


72 


68 


14 


3.0 


1.6 


1.2 


30 


33 


4.7 


497 


162 





118 


66 


74 


13 


4.0 


1.8 


1.2 


31 


24 





e5000 


135 





125 





365 





4.2 


1.6 





TOTAL 


100.04 


308.6 


15642.9 


29273 


13739 


6151 


3601 


1895 


1723 


203.9 


53.7 


44.4 


MEAN 


3.23 


10.3 


505 


944 


491 


198 


120 


61.1 


57.4 


6.58 


1.73 


1.48 


MAX 


33 


40 


5000 


9390 


2520 


680 


231 


365 


215 


12 


2.7 


2.3 


MIN 


.06 


2.6 


3.9 


135 


83 


75 


66 


24 


12 


3.0 


1.1 


1.1 


AC-FT 


198 


612 


31030 


58060 


27250 


12200 


7140 


3750 


3420 


404 


107 


88 


e Estimated. 

























228 



RUSSIAN RIVER BASIN 



11461000 RUSSIAN RIVER NEAR UKIAH, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1912 
OCT NOV DEC JAN FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


9.50 


125 


353 


530 


480 


353 


158 


38.8 


10.7 


2.12 


.50 


.5* 


MAX 


1*7 


682 


1663 


1765 


1975 


1436 


770 


149 


57.4 


10.8 


2.52 


2.70 


(WY) 


1963 


1974 


1965 


1970 


1958 


1983 


1963 


1983 


1993 


1983 


1983 


1983 


MIN 


.000 


.15 


1.77 


3.82 


14.3 


20.0 


4.33 


3.15 


.22 


.000 


.000 


.000 


(WY) 


1953 


1953 


1960 


1991 


1977 


1988 


1977 


1977 


1977 


1977 


1977 


1970 



SUMMARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1912 



1993 



47941.31 






72735,54 








131 






199 




171 

420 
5.76 


1983 
1977 


'5000 


Dec 


31 


9390 


Jan 20 


13300 


Dec 22 1964 


.00 


Aug 


7 


.06 


Oct 11 


.00 


Oct 1 1911 


.00 


Aug 


7 


.09 


Oct 7 


.00 


Oct 1 1911 








17700 


Jan 20 


18900 


Dec 21 1955 








20.87 


Jan 20 


20.87 


Jan 20 1993 


95090 






144300 




123500 




270 






486 




403 




6.3 






35 




12 




.04 






1.2 




.10 





RUSSIAN RIVER BASIH 229 

11461500 EAST FORK RUSSIAN RIVER HEAR CALPELLA, CA 

LOCATION. --Let id'lli'iiB", long 123'07'45", in NW 1/4 SW 1/4 sec. 18. T.16 N., R.ll W. , Mendocino County, 
Hydrologic Unit 18010110, on left bank 0.1 mi downstream from Cold Creek and 3.9 mi east of Calpella. 

DRAINAGE AREA.— 92.2 mi^. 

PERIOD OF RECORD. --October 1941 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. 

GAGE. — Water-stage recorder. Datum of gage is 787.87 ft above sea level. Prior to May 28, 1957, at site 1.3 mi 
downstream at different datum. May 28, 1957, to Apr. 5, 1966, at site 0.4 mi downstream at same datum. 

REMARKS. — Records fair. Flow greatly affected by diversion from Eel River through Potter Valley Powerplant 
Intake and Tailrace (stations 11471000, 11471099, respectively). Diversion for irrigation of eibout 
8,000 acres upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 18,700 ft^/s, Dec. 22, 1964^ gage height, 20.21 ft, site then 
in use; maximum gage height, 22.89 ft, Jan. 20, 1993; minimum daily, 1.7 ft^/s, July 23, 1990. 



EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 3,300 ft^/s and maximum (*): 

Discharge Gage height 
Date Time (ft^/s) (ft) Date Time 



Dec. 8 
Dec. 31 



2015 
2015 



Discharge 
(ft^/s) 



6,020 
8,680 



17.31 
21.13 



Jan. 20 
Fab. 19 



1445 
1915 



»10,200 
3,740 



Gage height 
(ft) 



*22.89 
14.31 



Minimum daily, 51 tf'/s. Aug. 19, 20. 



DISCHARGE, 



CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1992 TO SEPTE>eER 1993 
DAILY NEAN VALUES 



DAY 



CCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


147 


186 


145 


e2000 


442 


476 


441 


344 


443 


268 


113 


el27 


2 


154 


180 


157 


681 


424 


464 


405 


340 


382 


272 


119 


el27 


3 


154 


167 


166 


532 


419 


467 


382 


341 


360 


263 


123 


el26 


4 


155 


154 


157 


463 


417 


441 


394 


338 


391 


269 


130 


el21 


S 


146 


158 


152 


435 


417 


430 


373 


327 


413 


272 


133 


el23 


6 


144 


156 


501 


722 


407 


422 


374 


331 


403 


268 


139 


el24 


7 


147 


155 


322 


1260 


407 


417 


370 


335 


372 


267 


136 


el22 


8 


144 


155 


2200 


667 


449 


412 


390 


349 


357 


271 


131 


el21 


9 


131 


ISO 


1530 


722 


448 


407 


390 


344 


349 


247 


135 


e200 


10 


130 


151 


1610 


713 


566 


413 


380 


340 


343 


121 


134 


e275 


11 


143 


151 


977 


e600 


880 


404 


359 


336 


338 


132 


139 


281 


12 


155 


151 


431 


eSlS 


54 1 


400 


354 


338 


336 


134 


138 


284 


13 


151 


152 


261 


el200 


494 


397 


364 


340 


333 


126 


123 


284 


14 


143 


153 


217 


e2000 


473 


397 


362 


337 


329 


119 


111 


288 


IS 


131 


153 


201 


930 


457 


392 


360 


316 


319 


136 


115 


289 


16 


127 


153 


219 


981 


443 


403 


356 


333 


318 


142 


117 


278 


17 


139 


153 


355 


737 


772 


821 


521 


332 


316 


132 


125 


288 


18 


149 


150 


350 


631 


1390 


578 


465 


320 


318 


141 


121 


287 


19 


145 


155 


333 


620 


2520 


471 


399 


321 


306 


144 


51 


297 


20 


152 


152 


355 


6410 


1270 


434 


384 


338 


300 


125 


51 


304 


21 


169 


148 


345 


3360 


1020 


419 


377 


329 


304 


139 


108 


304 


22 


157 


159 


332 


1630 


915 


407 


371 


323 


290 


137 


107 


301 


23 


150 


156 


327 


933 


1590 


514 


367 


329 


287 


144 


el23 


296 


24 


153 


152 


308 


737 


857 


736 


391 


322 


280 


123 


el24 


293 


25 


150 


151 


287 


640 


679 


485 


367 


327 


292 


131 


el26 


298 


26 


152 


150 


308 


583 


591 


446 


358 


464 


273 


137 


el27 


298 


27 


153 


153 


306 


540 


537 


427 


358 


322 


289 


133 


el27 


280 


28 


155 


151 


591 


505 


501 


417 


355 


350 


281 


123 


el27 


274 


29 


171 


147 


1250 


483 





404 


346 


339 


276 


129 


el28 


283 


30 


189 


147 


720 


472 





394 


346 


359 


267 


134 


el2g 


278 


31 


189 





5130 


455 





422 





720 





116 


el28 





TOTAL 


4675 


4649 


20543 


33157 


20326 


14117 


11459 


10886 


9865 


5295 


3738 


7251 


MEAN 


151 


155 


663 


1070 


726 


455 


382 


351 


329 


171 


121 


242 


MAX 


169 


186 


5130 


6410 


2520 


821 


521 


720 


443 


272 


139 


304 


MIN 


127 


147 


145 


435 


407 


392 


346 


318 


267 


116 


51 


121 


AC-FT 


9270 


9220 


40750 


65770 


40320 


28000 


22730 


21590 


19570 


10500 


7410 


14380 


a Estimated. 

























230 



RUSSIAN RIVER BASIN 



11A61S00 EAST FORK RUSSIAN RIVER NEAR CALPELLA, CA--Contlnued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 19A2 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


232 


294 


481 


616 


607 


517 


353 


233 


163 


141 


142 


194 


MAX 


352 


738 


1476 


1720 


1755 


1611 


847 


422 


329 


275 


276 


298 


(WY) 


1963 


1982 


1965 


1970 


1958 


1983 


1982 


1983 


1993 


1967 


1952 


1967 


MIN 


A. 89 


74.0 


30.2 


42.2 


21.5 


42.7 


11.9 


23.5 


15.3 


8.25 


19.0 


23.9 


(WY) 


1960 


1978 


1960 


1991 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 



SU»1ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1942 - 1993 



96688 






145961 








264 






400 




330 
586 
76.8 


1983 
1977 


S130 


Dec 


31 


6410 


Jan 20 


12500 


Dec 22 1964 


47 


Sep 


3 


51 


Aug 19 


1.7 


Jul 23 1990 


85 


Sep 


1 


97 


Aug 16 


3.2 


Jul 11 1977 








10200 


Jan 20 


18700 


Dec 22 1964 








22.89 


Jan 20 


22.89 


Jan 20 1993 


191800 






289500 




239000 




409 






672 




548 




1S2 






319 




258 




104 






128 




79 





RUSSIAN RIVER BASIN 



231 



11462000 EAST FORK RUSSIAN RIVER NEAR URIAH, CA 

LOCATION.— Lat 39*11'51", long 123*11' 11", in Yokaya Grant, Mendocino County, Hydrologic Unit 18010110, on right 
bank of outlet channel, 500 ft downstream from Coyote Dam, 1,300 ft upstream from mouth, and 3.2 mi northeast 
of Ukiah. 

DRAINAGE AREA.— 105 mi^. 

WATER-DISCHARGE RECORDS 



PERIOD OF RECORD. --August 1911 to September 1913, October 1951 to June 1956, October 1957 to current year. 

GAGE. — Water-stage recorder and concrete control. Datum of gage is 614.41 ft above sea level. Prior to October 
1951, nonrecording gage at site 0.5 mi upstream at different datum. October 1951 to June 1956, water-stage 
recorder at site 1.0 mi upstream at different datum. 

REMARKS. --No estimated daily discharges. Records good. Flow affected by diversion from Eel River through Potter 
Valley Powerplant Intake (station 11471000) and since November 1956 by storage in Lake Mendocino, capacity, 
122,400 acre-ft, 500 ft upstream. Diversions upstream from station for irrigation of about 8,000 acres. 

EXTREMES FOR PERIOD OF RECORD. --Prior to regulation by Lake Mendocino, maximum discharge, 13,300 ft'/s, 
Dec. 21, 1955, gage height, 16.86 ft, site and datum then in use, from rating curve extended above 
6,300 ft /s on basis of maximum flow at station upstream which was defined to 8,600 ft /s; no flow 
Aug. 13-15, 1913. Maximum discharge (water years 1959-93), 7,350 ft^/s, Jan. 24, 1970, gage height, 10.84 ft; 
minimum daily, 0.02 ft^/s, Apr. 17, 1973. 

EXTREMES FOR CURRENT YEAR . —Maximum discharge, 4,080 ft^/s, Jan. 2, gage height, 6.93 ft; minimum dally, 
18 ft^/s, Feb. 18. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 
DAILY MEAN VALUES 



1992 TO SEPTEMBER 1993 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


246 


ISO 


153 


680 


281 


224 


242 


259 


431 


263 


234 


232 


2 


242 


ISO 


153 


2980 


136 


222 


244 


263 


492 


263 


234 


214 


3 


242 


ISO 


1S3 


3800 


131 


222 


246 


263 


495 


264 


234 


210 


4 


239 


149 


153 


2710 


137 


222 


246 


265 


494 


266 


238 


210 


5 


233 


146 


153 


976 


355 


222 


246 


336 


496 


267 


238 


210 


6 


227 


146 


153 


303 


503 


222 


246 


419 


497 


267 


238 


210 


7 


228 


146 


104 


303 


S04 


222 


246 


415 


503 


264 


238 


210 


8 


229 


146 


79 


573 


504 


224 


246 


410 


503 


202 


235 


210 


9 


226 


146 


26 


768 


500 


226 


246 


410 


503 


213 


237 


210 


10 


226 


146 


26 


756 


497 


226 


246 


409 


341 


234 


238 


210 


11 


226 


146 


59 


740 


497 


226 


246 


432 


237 


234 


230 


210 


12 


220 


150 


102 


736 


497 


226 


246 


373 


238 


232 


222 


211 


13 


202 


153 


97 


740 


497 


226 


418 


234 


238 


230 


222 


217 


14 


195 


153 


105 


1280 


497 


228 


508 


316 


307 


230 


222 


222 


IS 


197 


153 


105 


1610 


497 


230 


504 


316 


399 


230 


222 


222 


16 


198 


69 


105 


1010 


497 


230 


365 


319 


401 


230 


223 


222 


17 


195 


113 


105 


1010 


339 


230 


548 


321 


397 


230 


225 


222 


18 


195 


145 


103 


1000 


18 


232 


831 


320 


270 


230 


226 


222 


19 


195 


155 


105 


848 


19 


234 


543 


319 


180 


232 


226 


222 


20 


189 


151 


105 


209 


282 


234 


349 


320 


180 


234 


226 


222 


21 


184 


1S2 


107 


22 


1620 


234 


289 


316 


180 


224 


230 


222 


22 


184 


153 


114 


22 


1660 


235 


294 


320 


180 


206 


242 


221 


23 


179 


153 


116 


2260 


1590 


238 


298 


321 


189 


208 


250 


222 


24 


170 


153 


122 


3930 


2640 


238 


298 


293 


206 


210 


250 


222 


23 


170 


153 


128 


3710 


2920 


238 


300 


268 


262 


223 


250 


222 


26 


161 


153 


128 


2830 


1220 


238 


394 


267 


352 


234 


253 


222 


27 


155 


153 


128 


1420 


222 


238 


458 


408 


350 


234 


254 


222 


28 


153 


153 


105 


466 


222 


240 


458 


434 


317 


234 


252 


222 


29 


ISO 


153 


263 


514 





242 


463 


326 


263 


234 


253 


223 


30 


ISO 


153 


1190 


514 





242 


342 


329 


263 


231 


252 


222 


31 


ISO 





4SS 


514 





242 





331 





233 


250 





TOTAL 


6156 


4392 


5000 


39234 


19282 


7153 


10606 


10332 


10164 


7286 


7344 


6538 


MEAN 


199 


146 


161 


1266 


689 


231 


354 


333 


339 


235 


237 


218 


MAX 


246 


155 


1190 


3930 


2920 


242 


831 


434 


503 


267 


254 


232 


MIN 


150 


69 


26 


22 


18 


222 


242 


234 


180 


202 


222 


210 


AC-FT 


12210 


8710 


9920 


77820 


38250 


14190 


21040 


20490 


20160 


14450 


14570 


12970 



232 



RUSSIAN RIVEK BASIN 



11462000 EAST FORK RUSSIAN RIVER NEAR UKIAH. CA--Contlnued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1911 - 1958, BY WATER YEAR (WY) 

OCT MOV DEC JAM FEI MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


200 


271 


376 


871 


649 


461 


399 


30S 


213 


162 


166 


161 


MAX 


316 


♦ 37 


1138 


1289 


1784 


709 


775 


367 


307 


260 


272 


266 


(WY) 


19Sa 


1913 


19S6 


19S6 


1958 


1958 


1958 


1912 


1953 


1953 


1953 


1954 


MIN 


20.0 


21.0 


«0.0 


2S8 


105 


182 


214 


226 


102 


65.0 


23.8 


2.03 


(WY) 


1912 


1912 


1912 


1912 


1913 


1913 


1955 


1913 


1913 


1912 


1913 


1913 



SUWIARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1911 



1958 



356 








526 






1958 


183 






1912 


7300 


Dec 


22 


1955 


.00 


Aug 


13 


1913 


1.4 


Aug 


13 


1913 


13300 


Dec 


21 


1955 


16.86 


Dec 


21 


1955 


257700 








647 








286 








63 









STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 



OCt 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


222 


255 


388 


616 


600 


456 


315 


219 


221 


253 


262 


241 


MAX 


379 


635 


1175 


1905 


1934 


1780 


1026 


419 


339 


336 


388 


416 


(WY) 


1975 


1984 


1965 


1970 


1986 


1963 


1982 


1983 


1993 


1961 


1961 


1974 


MIN 


42.3 


13.4 


6.97 


20.7 


17.9 


13.3 


52.6 


76.3 


104 


179 


163 


92.7 


(WY) 


1978 


1978 


1978 


1977 


1977 


1977 


1977 


1968 


1988 


1986 


1988 


1977 



SUMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1960 - 1993 



89804 






133487 








245 






366 




336 
598 
103 


1983 
1977 


1650 


Fab 


16 


3930 


Jan 24 


6620 


Jan 25 1970 


26 


Dec 


9 


18 


Feb 18 


.02 


Apr 17 1973 


70 


Dec 


7 


70 


Dec 7 


.14 


Jan 2 1971 








4080 


Jan 2 


7350 


Jan 24 1970 








6.93 


Jan 2 


10.84 


Jan 24 1970 


78100 






264800 




243600 




204 






506 




522 




228 






234 




233 




111 






146 




60 





RUSSIAN RIVER BASIN 233 

11462000 EAST FORK RUSSIAN RIVER NEAR UKIAH. CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1953-55, 196*-68, 1973 to current year. 
CHEMICAL DATA: Water years 1953-55, 1973-82. 
BIOLOGICAL DATA: Water year 1977-78. 

WATER TEMPERATURE: Water years 1953-55, 1965-68, 1973 to current year. 
SEDIMENT DATA: Water years 1953-55, 196'i-68. 

PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: December 1952 to March 1955, October 1964 to September 1968, October 1972 to current year. 
SUSPENDED-SEDIMENT DISCHARGE: December 1952 to March 1955, January 1964 to September 1968. 

INSTRUMENTATION. — Water-temperature recorder since October 1972. Digital recorder set for 1-hour interval 
punches. 

RQIARKS. --Interruptions in record were due to malfunction of recording instrument. 

EXTREMES FOR PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: Maximum recorded, 23.5'C on several days in 1977; minimum recorded, 7.0'C, Jan. 14, 1973, 
many days in 1984, several days in 1989, Feb. 23, 25-28, 1990. 

EXTREMES FOR CURRENT YEAR.— 

WATER TEMPERATURE: Maximum recorded, 21.0*C, Oct. 1-5; minimum recorded, 7.S*C, several days In January. 

WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



lAY 


MAX 


MIN 




OCTOBER 


1 


21.0 


21.0 


2 


21.0 


21.0 


3 


21.0 


21.0 


4 


21.0 


20.5 


5 


21.0 


20.5 


6 


20.5 


20.0 


7 


20.5 


20.0 


8 


20.5 


20.0 


9 


20.5 


20.0 


10 


20.0 


20.0 


11 


20.0 


20.0 


12 


20.5 


20.0 


13 


20.0 


19.5 


14 


20.0 


19.5 


15 


20.0 


20.0 


16 


20.0 


19.5 


17 


20.0 


19.5 


18 


19.5 


19.5 


19 


19.5 


19.0 


20 


19.0 


19.0 


21 


19.0 


19.0 


22 


19.0 


18.5 


23 


19.0 


18.5 


24 


19.0 


18.5 


2S 


19.0 


18.5 


26 


18.5 


18.5 


27 


18.5 


18.5 


28 


18.5 


18.5 


29 


18.5 


18.5 


30 


18.5 


18.0 


31 


18.0 


18.0 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



NOVEMBER 


18.0 


17.5 


18.0 


17.5 


18.0 


17.5 


18.0 


17.5 


18.0 


17.5 


18.0 


17.5 


17.5 


17.5 


17.5 


17.5 


17.5 


17.5 


17.5 


16.5 


16.5 


16.0 


16.5 


15.5 


16.0 


15.5 


15.5 


15.5 


15.5 


15.5 


15.5 


15.0 


15.5 


15.0 


15.5 


15.0 


15.0 


15.0 


15.0 


14.5 


15.0 


14.5 


14.5 


14.0 


14.0 


13.5 


14.0 


13.5 


14.0 


13.5 


13.5 


13.0 


13.5 


13.0 


13.5 


13.0 


13.5 


13.0 


13.0 


13.0 



DECEMBER 



13.0 


12.5 


12.5 


12.5 


12.5 


12.5 


12.5 


12.0 


12.0 


12.0 


12.0 


11.5 


12.0 


11.0 


11.0 


10.5 


11.0 


10.5 


10.5 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.0 


11.0 


10.0 


10.0 


10.0 


10.0 


9.5 


10.0 


10.0 


10.0 


9.5 


10.0 


9.5 


10.0 


9.5 


9.5 


9.0 


9.5 


8.5 


9.5 


8.5 


9.5 


9.0 


9.5 


8.5 


9.0 


8.5 


9.0 


8.5 


9.5 


8.5 


9.0 


8.5 


9.0 


8.5 


9.0 


8.5 



JANUARY 


9.0 


8.0 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.0 


8.5 


8.0 


8.0 


8.0 


8.0 


8.0 


8.0 


7.5 


8.0 


8.0 


8.0 


7.5 


8.0 


7.5 


8.0 


7.5 


8.0 


7.5 


8.0 


7.5 


8.0 


7.5 


10.5 


7.5 


10.5 


8.5 


10.5 


9.0 


9.0 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


9.5 


8.5 


9.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 



FEBRUARY 


8.5 


8.5 


8.5 


8.5 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.5 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.5 


9.0 


8.5 


9.0 


8.0 


8.5 


8.0 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


9.0 


8.0 


8.5 


8.0 


8.5 


8.0 



MARCH 



8.0 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.0 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


9.0 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


8.5 


9.0 


8.5 


8.5 


8.5 


9.0 


8.5 


9.0 


8.5 


9.0 


8.5 


9.0 


8.5 



MONTH 21.0 



18.0 



18.0 



13.0 



13.0 



8.5 



10.5 



7.5 



9.0 



8.0 



9.0 



8.0 



234 



RUSSIAN RIVER BASIN 



11462000 EAST FORK RUSSIAN RIVER NEAR UKIAH, CA--Continued 
WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DAY 



MAX 



MIN 



APRIL 



MAX 



MIN 



MAY 



MAX 



MIN 



JUNE 



MAX MIN 
JULY 



MAX MIN 
AUGUST 



MAX 



MIN 



SEPTQIBER 



1 


9.0 


8.5 


2 


9.0 


8.5 


3 


9.0 


9.0 


4 


9.0 


8.5 


S 


8.0 


8.5 


6 


9.0 


8.5 


7 


9.S 


8.5 


8 


8.0 


8.5 


8 


9.0 


8.0 


10 


9.S 


9.0 


11 


9.5 


8.5 


12 


8.5 


9.0 


13 


8.5 


9.0 


14 


8.5 


8.0 


IS 


8.5 


8.5 


16 


9.5 


8.5 


17 


9.5 


8.0 


18 


8.5 


8.5 


19 


8.5 


8.0 


20 


8.5 


8.5 


21 


8.5 


8.5 


22 


9.5 


8.0 


23 


9.5 


9.0 


24 


9.5 


9.5 


2S 


10.0 


8.5 


26 


10.0 


8.0 


27 


10.0 


8.5 


28 


10.0 


9.5 


29 


10.0 


9.5 


30 


10.0 


9.5 


31 









10.0 


9.5 


10.5 


0.5 


10.0 


8.5 


10.5 


9.5 


10.5 


9.5 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


11.0 


10.5 


11.0 


10.0 


10.5 


10.5 


13.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


11.0 


11.0 


11.0 


11.0 


11.0 


11.0 


10.5 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.0 


12.0 


11.5 


12.0 


11.5 



12.0 


11.0 


12.0 


11.5 


12.0 


11.5 


12.0 


12.0 


12.5 


11.5 


12.0 


12.0 


12.5 


12.0 


12.5 


12.0 


12.5 


12.0 


12.5 


12.0 


12.5 


12,0 


12.5 


12.0 


12.5 


12.0 


13.0 


12.0 


13.0 


12.5 


13.5 


12.0 


13.0 


12.5 


13.0 


12.0 


13.0 


12.0 


13.0 


12.5 



17.0 


16.5 


17.0 


16.5 


17.0 


16.5 


17.0 


16.5 


17.5 


16.5 


17.5 


16.5 


17.5 


17.0 


17.5 


17.0 


17.5 


17.0 


17.5 


17.0 


18.0 


17.0 


18.0 


17.0 


18.0 


17.0 


18.0 


17.0 


18.0 


17.5 


18.0 


17.5 


18.5 


17.5 


18.5 


17.5 


18.5 


18.0 



18.5 


18.0 


18.5 


18.0 


18.5 


18.0 


18.5 


18.0 


19.0 


18.0 


19.0 


18.0 


19.0 


18.5 


19.0 


18.5 


19.0 


18.5 


19.5 


18.5 


19.5 


18.5 


19.5 


19.0 


19.5 


18.5 


20.0 


19.0 


20.0 


19.0 


19.5 


19.5 


20.0 


19.5 


20.0 


19.5 


20.0 


19.5 


20.5 


19.5 


20.5 


20.0 


20.5 


19.5 


20.5 


19.5 


20.5 


20.0 


20.5 


20.0 


20.5 


20.0 


20.5 


20.0 


20.5 


20.0 


20.0 


20.0 


20.5 


20.0 



MONTH 10.0 



8.5 



13.0 



9.5 



20.5 



18.0 



RUSSIAN RIVER BASIN 

ineasoo RUSSIAN river near HOPLAND, CA 



235 



LOCATION. --Lat 39'01'36", long 123°07'46", in Rancho de Sanel Grant, Mendocino County, Hydrologic Unit 18010110, 
on right bank at abandoned highway bridge, 0.2 mi downstream from McNab Creek, 4 mi north of Hopland, and 
15.2 mi downstream from Coyote Valley Dam on the East Fork Russian River. 



DRAINAGE AREA.— 362 mi". 



WATER-DISCHARGE RECORDS 



PERIOD OF RECORD. — October 1939 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. 

REVISED RECORDS. --WSP 1041: Drainage area. 

GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 497.61 ft above sea level. Prior to 
Sept. 9, 19A3, nonrecording gage at same site and datum. 

REMARKS. — Records fair. Diversions for irrigation of about 11,800 acres upstream from station. Flow also 

affected by diversion into basin (see REMARKS for East Fork Russian River stations) and since November 1958 by 
storage in Lake Mendocino, capacity, 129,600 acre-feet, 15.2 mi upstream. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 45,000 ft^/s, Dec. 22, 1955, gage height, 27.00 ft; minimum 
daily, 9.1 ft^/s, Apr. 20, 1977. 

EXTREMES OUTSIDE PERIOD OF RECORD. — Flood of December 1937 reached a stage of 30.0 ft, from floodmarks. 

EXTREMES FOR CURRENT YEAR. — Maximum discharge, 28,300 ft^/s, Jan. 20, gage height, 21.55 ft; minimum 
daily, 78 ft^/s, Nov. 17. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


217 


163 


160 


8970 


845 


836 


686 


426 


743 


284 


228 


223 


2 


225 


164 


169 


3750 


633 


766 


615 


410 


712 


273 


219 


193 


3 


228 


161 


223 


3580 


594 


746 


580 


408 


662 


276 


224 


164 


4 


221 


158 


199 


3000 


572 


670 


574 


418 


725 


273 


223 


179 


S 


226 


158 


181 


1860 


675 


620 


565 


425 


789 


284 


222 


180 


6 


216 


158 


598 


1060 


839 


590 


541 


507 


789 


282 


224 


195 


7 


217 


155 


813 


2400 


841 


559 


522 


506 


697 


292 


223 


195 


8 


216 


155 


2520 


1620 


978 


537 


534 


501 


655 


240 


228 


183 


9 


212 


155 


4880 


1760 


943 


508 


585 


496 


628 


228 


229 


180 


10 


212 


155 


3530 


1910 


937 


484 


539 


491 


530 


248 


231 


176 


11 


218 


155 


2400 


1430 


1740 


489 


501 


499 


390 


241 


226 


180 


12 


214 


155 


1610 


1250 


1270 


508 


471 


475 


368 


245 


212 


177 


13 


194 


155 


1020 


1890 


1100 


495 


541 


354 


352 


238 


205 


182 


14 


190 


155 


811 


5240 


1020 


497 


633 


402 


364 


238 


210 


191 


15 


190 


156 


698 


3840 


970 


490 


630 


397 


453 


234 


210 


196 


16 


187 


136 


629 


2790 


926 


484 


562 


397 


455 


234 


216 


197 


17 


185 


78 


614 


2030 


1510 


1100 


793 


394 


446 


241 


216 


196 


18 


185 


149 


609 


1710 


2650 


1130 


1180 


385 


390 


238 


212 


191 


19 


187 


160 


564 


1390 


5980 


838 


863 


389 


270 


245 


216 


187 


20 


192 


159 


583 


15500 


4740 


706 


667 


402 


254 


238 


214 


196 


21 


197 


158 


601 


8630 


4100 


637 


569 


398 


245 


237 


204 


205 


22 


187 


169 


562 


5510 


3850 


o592 


545 


389 


236 


238 


205 


203 


23 


184 


172 


535 


3800 


5270 


720 


565 


384 


226 


e237 


221 


204 


24 


169 


168 


523 


4720 


4630 


1340 


657 


372 


241 


e23S 


225 


203 


25 


168 


164 


518 


4360 


4220 


880 


568 


344 


252 


e233 


225 


204 


26 


166 


163 


506 


3610 


2780 


764 


581 


613 


354 


e230 


222 


202 


27 


158 


162 


498 


2600 


1160 


698 


630 


689 


368 


228 


221 


202 


28 


157 


162 


804 


1230 


960 


662 


620 


647 


362 


225 


221 


202 


29 


161 


162 


2010 


1140 





608 


e603 


505 


304 


228 


225 


199 


30 


178 


161 


2030 


1060 





571 


e483 


494 


291 


228 


225 


197 


31 


163 





8930 


996 





569 





830 





229 


227 





TOTAL 


6020 


4681 


40328 


104636 


56733 


21094 


18403 


14347 


13551 


7620 


6809 


5802 


MEAN 


194 


156 


1301 


3375 


2026 


680 


613 


463 


452 


246 


220 


193 


MAX 


228 


172 


8930 


15500 


5980 


1340 


1180 


830 


789 


292 


231 


223 


MIN 


157 


78 


160 


996 


572 


484 


471 


344 


226 


225 


204 


176 


AC-FT 


11940 


9280 


79990 


207500 


112500 


41840 


36500 


28460 


26880 


15110 


13510 


11510 


• Estimated. 

























236 



RUSSIAN RIVER BASIN 
11A62500 RUSSIAN RIVER NEAR HOPLAND, CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS IQliO - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


231 


kiiit 


1174 


1745 


1726 


1257 


719 


319 


215 


198 


206 


207 


MAX 


555 


1656 


4849 


5856 


6799 


5361 


2572 


820 


452 


326 


369 


383 


(WY) 


1958 


1984 


1965 


1970 


1958 


1983 


1982 


1983 


1993 


1961 


1961 


1974 


MIN 


35.1 


96.5 


87.6 


37.2 


28.7 


57.1 


44.1 


77.0 


59.6 


79.7 


105 


78.9 


(WY) 


1978 


1978 


1991 


1977 


1977 


1977 


1977 


1977 


1949 


1946 


1950 


1977 



SUrWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC -FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1940 - 1993 



182395 






300024 








498 






822 




699 

1587 
94.0 


1983 
1977 


8930 


Dec 


31 


15500 


Jan 20 


33800 


Dec 22 1955 


78 


Nov 


17 


78 


Nov 17 


9.1 


Apr 20 1977 


141 


Nov 


12 


141 


Nov 12 


13 


Apr 15 1977 








28300 


Jan 20 


45000 


Dec 22 1955 








21.55 


Jan 20 


27.00 


Dec 22 1955 


361800 






595100 




506400 




812 






1800 




1530 




218 






394 




254 




169 






169 




136 





RUSSIAN RIVER BASIN 

ineasoo Russian river near hopland, CA--continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1951 to March 1979, October 1989 to current year. 
CHEMICAL DATA: Water years 1951-66. 
WATER TEMPERATURE: Water years 1965-79. 
SEDIMENT DATA: October 1989 to September 1993 (discontinued). 

PERIOD OF DAILY RECORD.— 

WATER TEMPERATURE: September 1955 to March 1979. 

REMARKS. — Zero bedload discharge observed at flows less than 160 ft^/s. 



237 



PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



NOV 

03. .. 
DEC 

09... 
JAN 

12... 

21... 
FEB 

12. .. 





DIS- 






SEDI- 


SED. 


SED. 


SED. 




CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 




INST. 




SEDI- 


DIS- 


SIEVE 


SIEVE 


SIEVE 




CUBIC 


TEMPER- 


MENT. 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 




FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


Z FINER 


Z FINER 


TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 




SECOND 


(DEC C) 


(MG/L) 


(T/DAY) 


.062 Ml 


.125 m 


.250 m 


1410 


160 


17.5 


4 


1.7 


81 


— 


— 


1400 


3110 


— 


288 


2420 


96 


99 


100 


1715 


1240 


7.0 


46 


154 


82 


__ 


__ 


1300 


5710 


11.0 


788 


12100 


— 


— 


— 



1345 



1230 



12.0 



58 193 



83 



PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

BED BED 

MAT. MAT. 

SIEVE SIEVE 

DIAM. DIAM. 

Z FINER Z FINER 

THAN THAN 



28 
1 
4 

11 
2 











SAMPLE 


DIS- 


BED 








NUMBER 


LOC- 


CHARGE, 


MAT. 








OF 


ATION, 


INST. 


SIEVE 






TEMPER- 


SAM- 


CROSS 


CUBIC 


DIAM. 






ATURE 


PLING 


SECTION 


FEET 


Z FINE! 


DATE 


TIME 


WATER 


POINTS 


(FT FM 


PER 


THAN 






(DEG C) 


(COUNT) 


L BANK) 


SECOND 


.062 M 


JAN 














21... 


1525 


11.0 




92.0 


6030 




21... 


1535 


11.0 




142 


6030 


— 


21... 


1545 


11.0 




112 


6030 


-- 


21... 


1555 


11.0 




123 


6030 


— 


21... 


1600 


11.0 




193 


6030 


— 





BED 


BED 


BED 


BED 


BED 


BED 


BED 


BED 




MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


DATE 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 




.500 m 


1.00 m 


2.00 Ml 


4.00 Ml 


8.00 Ml 


16.0 Ml 


32.0 Ml 


64.0 MI 


JAN 


















21... 


36 


48 


60 


92 


100 


— 


— 


— 


21... 


2 


6 


17 


32 


49 


72 


100 


— 


21... 


8 


15 


30 


49 


66 


100 


— 


— 


21... 


19 


33 


53 


72 


85 


100 


— 


-- 


21... 


4 


5 


8 


12 


25 


48 


61 


100 



238 RUSSIAN RIVER BASIN 

11462500 RUSSIAN RIVER NEAR HOPLAND, CA--Continued 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 













TIME 


HORI- 


COMPSTD 




BAG 


TETHER 






ON BED 


ZONTAL 


SAMPLES 




MESH 


LINE 


START- 


END- 


FOR 


WIDTH 


IN 




SIZE 


USED IN 


ING 


ING 


BED 


OF 


X-SEC 


S/ilPLER 


BEDLOAD 


SAMPLNG 


TIME 


TIME 


LOAD 


VER- 


BEDLOAD 


TYPE 


SAMPLER 


(YES=1) 


(2A00 


(2400 


SAMPLE 


TICAL 


MEASMNT 



SAM- 
PLING 
DATE TIME METHOD, 

CODES (CODE) (rW) (CODE) HOURS) HOURS (SEC) (FEET) (NUM) 

DEC 

09... 1500 1000 1100 0.250 1430 1530 30 5 1 

JAN 

12... 1630 1000 1100 0.250 1625 1635 60 15.0 1 
21... 1355 1000 1100 0.250 1335 1415 10 7.0 2 
21... 1435 1000 1100 0.250 1420 1450 10 7.0 2 

FEB 

12... 1452 1000 1100 0.250 1430 1515 30 5.0 1 

VER- SAMPLE DIS- DISCH, SEDI- SED. SED. 

TICALS NUMBER LCC- CHARGE, BEDLOAD MENT BEDLOAD BEDLOAD 

IN OF ATION, INST. AV UNIT DIS- SIEVE SIEVE 

COM- SAM- CROSS CUBIC TEMPER- FOR COM CHARGE, DIAM. DIAM. 

POSITE PLING SECTION FEET ATURE POSITE BEDLOAD Z FINER Z FINER 

DATE SAMPLE POINTS (FT FM PER WATER SAMPLE (TONS/ THAN THAN 

(NUM) (COUNT) L BANK) SECOND (DEG C) T/D/FT DAY) .062 hW . 125 ^t1 

DEC 

09... 25 25 22.0 2940 -- 2.90 362 

JAN 

12... 5 

21... 21 

21... 21 

FEB 

12... 16 16 15.0 1220 12,0 0.11 8.8 



5 


15.0 


1240 


21 


22.0 


5860 


21 


22.0 


5900 



7.0 


0,06 


4 


11.0 


4.90 


603 


11.0 


3.30 


603 



SED. 


SED. 


SED. 


SED, 


SED. 


SED, 


SED, 


SED, 


SED. 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


BEDLOAD 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM, 


DIAM, 


DIAM, 


DIAM, 


DIAM, 


DIAM, 


DIAM. 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


.250 tt^ 


.500 »1 


1,00 htl 


2,00 1*1 


4,00 »1 


8,00 M^ 


16,0 »1 


32,0 Ml 


64.0 ^M 



DATE 

DEC 

09... — — 2 14 41 70 91 100 

JAN 

12... 15 49 70 84 94 98 100 

21... 2 4 7 12 22 46 76 91 100 

21... 3 6 10 21 38 57 84 100 

FEB 

12... 22 83 94 97 99 100 



RUSSIAN RIVER BASIN 
11463000 RUSSIAN RIVER NEAR CLOVERDALE, CA 



239 



LOCATION. --Lat 38*52'<i6", long 123'03'09", in NW 1/4 NW 1/A sec. 23, T.12 N., R.ll W. , Mendocino County, 

Hydrologic Unit 18010110, on left bank 0.3 mi downstream from Cuimisky Creek, S.S mi northwest of Cloverdale, 
and 28 mi downstream from Coyote Dam. 

DRAINAGE AREA.— 503 ml 2. 

PERIOD OF RECORD. — July 1951 to current year. 

GAGE. — Water-stage recorder and crest-stage gage. Elevation of gage is 350 ft above sea level, from topographic 
map. Prior to July 30, 1970, at site 0.2 mi upstream at different datum. 

REMARKS. — No estimated daily discharge. Records fair. Diversions for irrigation of about 15,000 acres upstream 
from station. Flow also affected by diversion into basin (see REMARKS for East Fork Russian River stations) 
and since November 1958 by storage in Lake Mendocino. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 55,200 ft^/s, Dec. 22, 1964, gage height, 31.60 ft, site and 
datum then In use; minimum daily, 12 ft /s, Apr. 22, 1977. 

EXTREMES FOR CURRENT YEAR. —Maximum discharge, 26,900 ft^/s, Jan. 21, gage height, 19.60 ft; minimum daily, 
101 ft^/s, Nov. 17. 



DAY 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


208 


186 


170 


14800 


1120 


1440 


793 


573 


1050 


266 


212 


213 


2 


227 


180 


181 


5150 


813 


1300 


1010 


515 


957 


249 


201 


193 


3 


239 


172 


280 


4530 


725 


1240 


888 


493 


862 


246 


194 


175 


4 


229 


165 


237 


3590 


661 


1110 


808 


507 


893 


242 


203 


176 


5 


234 


163 


208 


1890 


678 


1020 


774 


475 


1080 


256 


205 


173 


6 


225 


161 


1060 


3340 


893 


949 


760 


557 


1050 


267 


207 


187 


7 


222 


159 


1530 


3440 


901 


885 


713 


581 


920 


258 


199 


187 


8 


220 


158 


2110 


2670 


1230 


829 


678 


569 


842 


250 


210 


175 


9 


219 


158 


7740 


3340 


1150 


778 


660 


564 


787 


211 


219 


174 


10 


216 


158 


6930 


2770 


1180 


734 


819 


558 


713 


214 


217 


170 


11 


218 


158 


4100 


2420 


2550 


696 


711 


552 


493 


218 


222 


173 


12 


220 


158 


2160 


2120 


1760 


662 


654 


565 


445 


214 


213 


172 


13 


203 


160 


1200 


3690 


1460 


669 


594 


488 


415 


205 


205 


174 


14 


189 


161 


823 


8810 


1310 


647 


619 


431 


394 


207 


207 


181 


15 


186 


161 


621 


7370 


1200 


638 


782 


438 


476 


202 


208 


190 


16 


188 


161 


492 


5500 


1120 


622 


780 


434 


489 


200 


218 


188 


17 


188 


101 


430 


3700 


2270 


613 


713 


428 


475 


200 


212 


187 


18 


182 


133 


418 


3000 


4890 


1540 


1290 


414 


461 


198 


205 


185 


19 


192 


156 


359 


2580 


10000 


1670 


1520 


429 


308 


211 


208 


179 


20 


192 


164 


345 


19400 


8390 


1250 


1160 


451 


275 


216 


215 


184 


21 


200 


163 


380 


15000 


5640 


1060 


909 


444 


261 


217 


203 


193 


22 


190 


175 


335 


8850 


5230 


936 


769 


425 


249 


205 


186 


188 


23 


189 


184 


306 


4830 


8060 


848 


718 


414 


231 


191 


199 


181 


24 


179 


185 


287 


5690 


6750 


1050 


813 


414 


226 


186 


206 


178 


2S 


175 


178 


277 


5120 


5500 


2160 


818 


386 


226 


170 


208 


186 


26 


173 


173 


265 


4260 


4060 


1420 


722 


901 


304 


190 


205 


190 


27 


162 


171 


255 


3500 


2010 


1210 


755 


1090 


345 


200 


202 


187 


28 


154 


171 


638 


1750 


1640 


1080 


788 


928 


354 


200 


203 


190 


29 


183 


171 


2300 


1530 





1040 


760 


677 


299 


203 


203 


189 


30 


208 


171 


2230 


1390 





904 


741 


614 


279 


209 


210 


187 


31 


187 





10300 


1270 





828 





1140 





210 


217 





TOTAL 


6197 


4915 


48967 


157300 


83191 


31828 


24519 


17455 


16159 


6711 


6422 


5505 


MEAN 


200 


164 


1580 


5074 


2971 


1027 


817 


563 


539 


216 


207 


183 


MAX 


239 


186 


10300 


19400 


10000 


2160 


1520 


1140 


1080 


267 


222 


213 


MIN 


154 


101 


170 


1270 


661 


613 


594 


386 


226 


170 


186 


170 


AC-FT 


12290 


9750 


97130 


312000 


165000 


63130 


48630 


34620 


32050 


13310 


12740 


10920 



240 



RUSSIAN RIVER BASIN 



11463000 RUSSIAN RIVER NEAR CLOVERDALE. CA- -Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1993, BY WATER YEAR (WY) 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



OCT 

250 

659 

1963 

34.5 

1978 



NOV 

616 
2636 
1984 

114 
1992 



DEC 

1610 
6398 
1965 
97.8 
1991 



JAN 

2548 
8162 
1970 
53.7 
1977 



FEB 

2444 
9387 
1958 
44.5 
1977 



SUhWARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 

242423 
662 



10300 
101 
148 



480800 

1290 

215 

175 



Dec 31 
Nov 17 
Nov 13 



MAR 

1757 
7015 
1983 
97.2 
1977 



APR 

926 
3708 
1982 
47.3 
1977 



MAY 

373 
1156 
1983 
80.7 
1977 



FOR 1993 WATER YEAR 

409169 
1121 



19400 

101 

148 

26900 

19.60 

811600 

2620 

414 

175 



Jan 20 
Nov 17 
Nov 13 
Jan 21 
Jan 21 



JUN 

236 

539 

1993 

99.9 

1988 



JUL 

213 
312 

1961 
117 

1988 



AUG 

222 

359 
1961 

118 
1988 



SEP 

216 

385 

1974 

72.5 

1977 



WATER YEARS 1951 - 1993 



945 








2144 






1983 


99.2 






1977 


42800 


Dec 


22 


1964 


12 


Apr 


22 


1977 


16 


Apr 


16 


1977 


55200 


Dec 


22 


1964 


31.60 


Dec 


22 


1964 


684600 








2240 








266 








156 









RUSSIAN RIVER BASIN 241 

11463170 BIG SULPHUR CREEK AT GEYSERS RESORT, NEAR CLOVERDALE, CA 

LOCATION. --Lat 38*47'52", long IZZ'AS' 05" , in NW 1/4 NW 1/4 sec. 19, T.ll N., R.8 W. , Sonoma County, Hydrologic 
Unit 18010110, on left bank 400 ft dovmstream from unnamed tributary and 12 mi east of Cloverdalo. 

DRAINAGE AREA.— 13.1 mi^. 

PERIOD OF RECORD. — October 1980 to current year. 

GAGE. --Water-stage recorder. Elevation of gage is 1,430 ft above sea level, from topographic map. 

REMARKS. — Records good. Diversion for industrial use 150 ft upstream from station when flows are above 10 ft /s. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 5,700 ft^/s, Feb. 17, 1936, gage height, 8.98 ft, from rating 
curve extended above 1,200 ft /s on basis of culvert computation of peak flow; minimum daily, 0.08 ft /s, 
Aug. 31, 1983. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 1,000 ft^/s and maximum (*): 



Date 



Dec. 10 
Dec. 31 



Time 



1200 
2345 



Discharge Gage height 
(ft^/s) (ft) 



1,990 
2,830 



6.99 
7.57 



Date 



Jan. 20 
Feb. 19 



Time 



1030 
1815 



Discharge 
(ft^/s) 



*3,200 
1,360 



Gage height 
(ft) 

*7.79 
6.43 



Minimum daily, 1.0 ff'/s, Oct. 10-15. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


1.4 


22 


1.9 


1020 


22 


47 


35 


16 




27 


8.7 


3.6 


2.1 


2 


1.9 


11 


28 


314 


21 


38 


30 


15 




23 


8.4 


3.5 


2.1 


3 


1.9 


5.3 


21 


159 


19 


38 


27 


15 




20 


8.1 


3.2 


2.1 


4 


1.3 


4.0 


8.1 


74 


17 


27 


27 


14 




38 


8.0 


2.9 


2.0 


5 


1.2 


3.3 


5.5 


54 


18 


22 


25 


15 




30 


7.9 


2.9 


1.9 


6 


1.2 


3.0 


204 


130 


16 


18 


24 


15 




25 


7.2 


3.0 


1.8 


7 


1.2 


3.0 


62 


361 


21 


16 


22 


14 




22 


7.1 


3.0 


1.9 


8 


1.1 


3.0 


495 


225 


91 


15 


30 


14 




21 


7.1 


2.8 


2.0 


9 


1.1 


3.0 


425 


145 


61 


15 


24 


13 




19 


6.7 


2.8 


1.9 


10 


1.0 


3.0 


963 


107 


87 


15 


22 


13 




18 


6.3 


2.7 


1.9 


11 


1.0 


3.0 


291 


75 


161 


17 


20 


11 




16 


5.9 


2.7 


1.9 


12 


1.0 


3.0 


119 


80 


88 


16 


20 


11 




16 


6.3 


2.8 


1.9 


13 


1.0 


2.6 


68 


479 


58 


15 


19 


10 




15 


5.9 


2.8 


1.8 


14 


1.0 


2.3 


43 


e637 


46 


14 


18 


10 




14 


5.8 


2.6 


1.7 


15 


1.0 


2.3 


29 


642 


36 


15 


18 


10 




14 


5.7 


2.5 


1.6 


16 


1.1 


2.1 


23 


e560 


30 


18 


16 


10 




13 


5.7 


2.5 


1.7 


17 


1.2 


2.1 


23 


380 


235 


160 


213 


9. 


4 


12 


5.7 


2.6 


1.7 


18 


1.2 


2.0 


22 


275 


391 


148 


93 


9. 


3 


12 


5.5 


2.5 


1.7 


19 


1.1 


2.1 


21 


244 


771 


61 


56 


12 




11 


5.3 


2.4 


1.6 


20 


2.9 


2.3 


22 


1980 


484 


41 


40 


11 




11 


5.2 


2.5 


1.7 


21 


5.9 


2.3 


20 


1010 


278 


30 


30 


9. 


7 


10 


5.0 


2.5 


1.7 


22 


1.8 


2.8 


20 


595 


259 


24 


26 


9. 


3 


9.7 


4.6 


2.5 


1.7 


23 


1.4 


2.4 


19 


277 


532 


84 


28 


9. 


1 


8.9 


4.5 


2.4 


1.7 


24 


1.3 


2.3 


18 


172 


277 


105 


26 


11 




8.5 


4.6 


2.5 


1.7 


25 


1.3 


2.3 


17 


116 


171 


54 


22 


11 




8.9 


4.3 


2.3 


1.7 


26 


1.2 


2.3 


16 


87 


116 


41 


21 


57 




8.6 


4.3 


2.3 


1.7 


27 


1.2 


2.1 


16 


65 


82 


37 


20 


53 




7.8 


3.9 


2.3 


2.0 


28 


1.2 


2.1 


115 


50 


62 


33 


18 


26 




7.7 


3.6 


2.3 


1.8 


29 


38 


2.1 


157 


42 





26 


18 


19 




7.5 


3.6 


2.3 


1.6 


30 


26 


2.1 


74 


34 





21 


16 


19 




7.5 


3.6 


2.1 


1.7 


31 


17 





1340 


28 





33 





39 







3.6 


2.1 


___ 


TOTAL 


122.1 


107.2 


4686.5 


10417 


4450 


1244 


1004 


510, 


8 


462.1 


178.1 


81.9 


54.3 


MEAN 


3.94 


3.57 


151 


336 


159 


40.1 


33.5 


16. 


5 


15.4 


5.75 


2.64 


1.81 


MAX 


38 


22 


1340 


1980 


771 


160 


213 


57 


38 


8.7 


3.6 


2.1 


MIN 


1.0 


2.0 


1.9 


28 


16 


14 


16 


9. 


1 


7.5 


3.6 


2.1 


1.6 


AC-FT 


242 


213 


9300 


20660 


8830 


2470 


1990 


1010 


917 


353 


162 


108 


e Es 


itimated. 



























242 



RUSSIAN RIVER BASIN 
11A63170 BIG SULPHUR CREEK AT GEYSERS RESORT. NEAR CLOVERDALE, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1981 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


4.06 


33.1 


74.7 


79.5 


116 


107 


31.7 


16.0 


5.96 


2.45 


1.29 


1.34 


MAX 


20.9 


146 


243 


336 


571 


297 


162 


81.6 


17.1 


5.75 


2.64 


2.90 


(WY) 


1990 


1984 


1984 


1993 


1986 


1983 


1982 


1990 


1990 


1993 


1993 


1985 


MIN 


.74 


1.22 


1.81 


2.52 


7.34 


8.57 


8.44 


4.79 


2.62 


.86 


.70 


.65 


(WY) 


1989 


1981 


1991 


1991 


1989 


1988 


1990 


1986 


1987 


1984 


1988 


1988 



SUmARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1981 - 1993 



12451.47 






23318.0 








34.0 






63.9 




39.0 
86.6 
17.4 


1983 
1985 


1340 


Dec 


31 


1980 


Jan 20 


3920 


Feb 17 1986 


.81 


Aug 


30 


1.0 


Oct 10 


.08 


Aug 31 1983 


.86 


Aug 


29 


1.0 


Oct 9 


.24 


Oct 13 1983 








3200 


Jan 20 


5700 


Feb 17 1986 








7.79 


Jan 20 


8.98 


Feb 17 1986 


24700 






46250 




28270 




56 






152 




85 




5.1 






13 




5.7 




1.0 






1.7 




.92 





RUSSIAN RIVER BASIN 



243 



11463200 BIG SULPHUR CREEK NEAR CLOVERDALE. CA 



LOCATION. --Lat 38'49'34", long 122*59'45", in Rincon de Masalacon Grant, Sonoma County, Hydrologic Unit 18010110, 
on right bank 900 ft downstream from unnamed tributary, 1.0 mi upstream of Russian River and 1.8 mi northeast 
of Cloverdale. 

|2 



DRAINAGE AREA. --85. 5 mi - 

PERIOD OF RECORD. --July 1957 to September 1972. 

only) . 
REVISED RECORDS.— WSP 1929: 1958-60. 
GAGE. — Water-stage recorder. Elevation of gage is 350 ft above sea level, 

September 1972, at site 0.8 mi upstream at different datum. 
REMARKS. --Records good. Diversions for irrigation and geothermal recharge upstream from station. 

computed above 200 ft /s. 
EXTREMES FOR PERIOD OF RECORD. --Maximum discharge (water years 1958-72), 15,700 ft^/s, Dec^ 22, 1964, gage 

height, 15.08 ft, site and datum then in use, from rating curve extended above 5,700 ft /s on basis of 

slope-area measurement at gage height 16.8 ft; minimum daily, 1.3 ft /s, Sept. 27, 1991. 
EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of Dec. 22, 1955, reached a stage of 16.8 ft from floodmarks, site and 

datum then in use, discharge, 20,000 ft /s, by slope-area measurement of peak flow. 



October 1989 to current year (since October 1989, low flow 



from topographic map. Prior to 



No flow 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



cx:t 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


3.3 


51 


5.3 


2 


S.O 


35 


12 


3 


6.4 


20 


142 


4 


6.2 


14 


37 


S 


4.7 


11 


21 


6 


4.0 


9.7 





7 


3.1 


8.4 





8 


2.8 


7.5 





9 


2.9 


7.1 





10 


2.8 


6.8 





11 


2.7 


6.4 





12 


2.6 


6.0 





13 


2.5 


6.0 





14 


2.6 


5.8 


160 


IS 


2.5 


5.7 


118 


16 


2.6 


5.5 


91 


17 


2.7 


5.5 


85 


18 


2.7 


5.5 


74 


19 


2.5 


5.9 


65 


20 


3.1 


6.5 


64 


21 


21 


6.3 


61 


22 


11 


9.2 


53 


23 


6.2 


9.8 


47 


24 


4.8 


7.9 


42 


25 


4.1 


6.9 


38 


26 


3.9 


6.4 


34 


27 


3.9 


6.2 


33 


28 


3.9 


5.9 





29 


76 


5.5 





30 


86 


5.5 





31 


39 








TOTAL 


327.5 


298.9 





MEAN 


10.6 


9.96 





MAX 


86 


51 





MIN 


2.5 


5.5 





AC-FT 


650 


593 






174 



187 
151 
123 
104 
89 



77 
70 
63 
57 
60 
53 
53 

147 
168 



194 

136 

111 

94 

83 



198 
186 
175 
166 
159 

154 
148 
143 
140 
135 
135 



186 



188 
173 
181 



191 
177 
170 
161 
154 
148 
150 
164 
143 

135 
129 
124 
120 
116 
110 



166 

144 
133 
133 
147 
122 
113 
106 
100 
95 
91 



85 


178 


33 


13 


7.0 


82 


139 


32 


12 


6.8 


86 


119 


31 


12 


6.3 


86 


169 


30 


12 


6.4 


82 


182 


29 


12 


6.0 


79 


147 


28 


12 


5.7 


76 


124 


27 


11 


5.7 


73 


105 


25 


11 


5.6 


72 


95.0 


25 


11 


5.4 


69 


86.4 


24 


11 


5.6 


64 


80.9 


23 


11 


5.7 


64 


75.6 


22 


11 


5.7 


63 


71.7 


22 


11 


5.7 


62 


66.7 


21 


10 


5.7 


61 


64.3 


20 


10 


5.7 


58 


60.6 


20 


9.9 


6.2 


55 


57.1 


20 


9.5 


6.5 


54 


54.9 


20 


9.0 


6.3 


66 


50.5 


19 


8.9 


6.3 


72 


49.5 


19 


9.2 


6.0 


62 


48.4 


19 


9.3 


5.5 


56 


46.4 


18 


8.7 


5.5 


53 


44.4 


17 


8.3 


5.5 


56 


41.5 


17 


7.8 


5.5 


68 


38 


16 


7.6 


5.4 


161 


38 


16 


7.2 


5.5 





35 


16 


7.2 


5.5 


173 


34 


16 


6.8 


5.2 


121 


34 


16 


6.3 


5.2 


107 


33 


15 


6.3 


4.9 








14 


6.8 








2368.9 


670 


298.8 


174.0 





79.0 


21.6 


9.64 


5.80 





182 


33 


13 


7.0 





33 


14 


6.3 


4.9 





4700 


1330 


593 


345 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1957 - 1972, BY WATER YEAR (WY) 



MEAN 


38.2 


99.8 


387 


611 


564 


286 


224 


60.0 


26.3 


10.7 


6.26 


8.21 


MAX 


290 


283 


1228 


1972 


1962 


747 


726 


175 


67.0 


22.0 


11.9 


51.4 


(WY) 


1963 


1967 


1965 


1970 


1958 


1958 


1958 


1963 


1967 


1963 


1967 


1957 


MIN 


4.08 


4.15 


6.82 


94.0 


81.7 


66.4 


37.9 


21.9 


11.0 


4.23 


3.13 


2.79 


(WY) 


1967 


1960 


1960 


1962 


1964 


1964 


1964 


1959 


1959 


1959 


1959 


1970 



SUM1ARY STATISTICS 



WATER YEARS 1957 



1972 



ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



192 








376 






1958 


53.1 






1972 


10400 


Dec 


22 


1964 


1.8 


Oct 


20 


1964 


2.0 


Oct 


15 


1964 


15700 


Dec 


22 


1964 


15.08 


Dec 


22 


1964 


138800 








395 








33 








4.2 









2*4 RUSSIAN RIVER BASIN 

11A63980 RUSSIAN RIVER AT DIGGER BEND, NEAR HEALDSBURG, CA 

LOCATION. --Lat 38*37'59", long 122'51'16", in Sotoyoroe Grant, Sonoma County, Hydrologic Unit 18010110, on right 
bank, 1,800 ft dovmstream from unnamed tributary and 1.6 mi northeast of Healdsburg. 

DRAINAGE AREA.--791 mi 2. 

PERIOD OF RECORD. --October 1988 to current year (low flow only). Records for October 1985 to September 1988 are 
in the files of the U.S. Geological Survey. 

GAGE. --Water-stage recorder. Elevation of gage is 100 ft above sea level, from topographic map. 

RQIARKS. — No estimated daily discharges. Records good. No records computed above 300 ft /s. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 

DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 



1 


181 


250 


177 


2 


193 


247 


198 


3 


209 


224 


296 


4 


214 


205 





S 


209 


196 


265 


6 


209 


189 





7 


204 


182 





8 


200 


178 





9 


200 


176 





10 


197 


173 





11 


193 


173 





12 


196 


173 





13 


195 


172 





14 


185 


177 





IS 


180 


179 





16 


180 


180 





17 


179 


179 





16 


175 


151 





19 


173 


157 





20 


183 


171 





21 


205 


177 





22 


202 


184 





23 


192 


190 





24 


187 


195 





25 


180 


195 





26 


177 


191 





27 


175 


188 





28 


168 


185 





29 


201 


185 





30 


255 


182 





31 


269 








TOTAL 


6066 


5604 





MEAN 


196 


187 





MAX 


269 


250 





MIN 


168 


151 





AC-FT 


12030 


11120 









212 


206 





216 


205 





210 


191 





211 


179 





215 


176 





218 


172 


298 


218 


183 





212 


185 


27'. 


215 


158 


259 


220 


164 


259 


223 


159 


257 


225 


160 


247 


217 


162 


237 


209 


161 


235 


209 


165 


234 


206 


173 


233 


207 


174 


231 


211 


171 


235 


212 


169 


246 


212 


165 


252 


211 


168 


251 


203 


173 


235 


194 


174 


224 


193 


170 


21'i 


197 


169 


207 


201 


173 


217 


197 


171 


221 


192 


168 


215 


193 


168 


214 


192 


169 


214 


200 








6451 


5191 





208 


173 





225 


206 





192 


159 





12800 


10300 



RUSSIAN RIVER BASIN 2*5 

11*64000 RUSSIAN RIVER NEAR HEALDSBURG, CA 

LOCATION.— Lat 38*36'48", long 122*50'07", in Sotoyome Grant, Sonoma County, Hydrologlc Unit 18010110, on left 
bank 2 mi east of Healdsburg and 3 . 5 mi upstream from Dry Creek . 

DRAINAGE AREA. —793 mi^. 



WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. — October 1939 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. 

REVISED RECORDS.— WSP 981: 1942. WSP 1929: Drainage area. 

GAGE. --Water-stage recorder. Datum of gage is 77.01 ft above sea level. 

REMARKS. --Records good. Several diversions for irrigation of about 17,800 acres upstream from station. Flow 
also affected by diversion into basin (see REMARKS for East Fork Russian River stations) and since November 
1958 by storage in Lake Mendocino 63 mi upstream. 



EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 71,300 ft^/s, Dec. 23, 1964, gage 
gage height, 30.0 ft, Feb. 28, 1940; minimum daily discharge, 12 ft^/s, June 14, 



height, 27.00 ft; maximum 
1988. 



EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of December 1937 reached a stage of 30.8 ft, from floodmarks. 



EXTREMES FOR CURRENT YEAR. --Maximum discharge, 43,600 ft^/s, Jan. 20, gage he 
133 ft^/s, July 26. 



ight, 19.30 ft.; minimum daily. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


183 


236 


168 


28300 


1980 


2750 


1580 


823 


1290 


345 


200 


el90 


2 


193 


237 


187 


9700 


1720 


2230 


1480 


735 


1070 


325 


197 


193 


3 


210 


213 


273 


6900 


1480 


2060 


1340 


707 


953 


309 


177 


181 


4 


217 


196 


305 


5800 


1340 


1840 


1260 


709 


915 


305 


el90 


164 


S 


213 


185 


255 


4660 


1280 


1600 


1220 


692 


1260 


306 


e200 


164 


6 


213 


178 


352 


3120 


1360 


1440 


1140 


693 


1190 


317 


eig2 


173 


7 


207 


173 


2300 


6990 


1410 


1310 


1070 


732 


1110 


305 


el90 


el80 


8 


204 


168 


1570 


5470 


2160 


1250 


1010 


733 


991 


309 


el98 


el77 


g 


204 


164 


10600 


4240 


2380 


1240 


1120 


719 


918 


269 


e200 


164 


10 


201 


164 


9380 


4850 


2000 


1150 


1050 


712 


861 


228 


e210 


156 


11 


198 


162 


8820 


3820 


4860 


1080 


981 


706 


745 


233 


e214 


153 


12 


201 


162 


3950 


3140 


3510 


1020 


910 


710 


633 


231 


e208 


155 


13 


201 


161 


2250 


6380 


2700 


978 


855 


688 


594 


209 


e200 


156 


14 


192 


164 


1500 


11900 


2330 


950 


926 


589 


550 


200 


e200 


156 


IS 


188 


164 


1120 


11100 


2070 


938 


986 


587 


545 


202 


e205 


162 


16 


186 


164 


881 


10500 


1890 


911 


973 


580 


599 


206 


e205 


171 


17 


184 


163 


755 


6690 


2840 


2410 


1370 


570 


e596 


211 


e205 


168 


IB 


184 


139 


663 


5500 


8950 


3070 


2510 


559 


e521 


215 


e200 


167 


19 


182 


140 


587 


4160 


14800 


2270 


1860 


543 


e461 


224 


el95 


215 


20 


194 


153 


523 


27200 


16600 


1760 


1480 


565 


e414 


237 


el88 


166 


21 


209 


160 


514 


30500 


9980 


1510 


1220 


570 


e388 


227 


el90 


170 


22 


205 


168 


484 


19100 


8870 


1360 


1070 


552 


e369 


225 


el92 


175 


23 


194 


172 


442 


9540 


13600 


1360 


1000 


535 


376 


195 


el88 


172 


24 


189 


178 


405 


8890 


11400 


3250 


1150 


534 


341 


168 


el82 


169 


25 


181 


177 


376 


7760 


8630 


2450 


1080 


548 


373 


155 


el80 


168 


26 


178 


173 


354 


6630 


7150 


1960 


973 


627 


e357 


133 


el90 


174 


27 


176 


172 


335 


5710 


4160 


1740 


970 


1440 


e413 


187 


el88 


173 


28 


171 


170 


680 


3470 


3240 


1730 


984 


1190 


450 


209 


el82 


171 


29 


205 


168 


2650 


2720 





1510 


949 


878 


462 


200 


el82 


172 


30 


249 


168 


3400 


2390 





1370 


915 


706 


400 


202 


el86 


172 


31 


257 





9540 


2140 





1280 





992 





205 


el90 





TOTAL 


6169 


5192 


65619 


269270 


144690 


51777 


35432 


21924 


20165 


7292 


6024 


5127 


MEAN 


199 


173 


2117 


8686 


5167 


1670 


1181 


707 


672 


235 


194 


171 


MAX 


257 


237 


10600 


30500 


16600 


3250 


2510 


1440 


1290 


345 


214 


215 


MIN 


171 


139 


168 


2140 


1280 


911 


855 


534 


341 


133 


177 


153 


AC-FT 


12240 


10300 


130200 


534100 


287000 


102700 


70280 


43490 


40000 


14460 


11950 


10170 


e Es 


itimated. 

























246 



RUSSIAN RIVER BASIN 
11464000 RUSSIAN RIVER NEAR HEALDSBURG. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


261 


818 


2481 


3675 


3656 


2736 


1460 


537 


260 


186 


187 


191 


MAX 


1605 


5293 


8945 


13670 


14650 


11610 


6592 


1638 


672 


300 


331 


360 


(WY) 


1956 


1974 


1956 


1970 


1966 


1983 


1962 


1963 


1993 


1961 


1974 


1974 


MIN 


33.7 


122 


111 


90.9 


56.7 


146 


55.7 


85.1 


81.3 


70.5 


82.8 


67.4 


(WY) 


1978 


1992 


1991 


1977 


1977 


1977 


1977 


1977 


1977 


1947 


1947 


1977 



SU^«ARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1940 



1993 



325074 






638681 








668 






1750 




1397 

3277 

101 


1983 
1977 


11800 


Feb 


12 


30500 


Jan 21 


62700 


Dec 23 1964 


139 


Nov 


18 


133 


Jul 26 


12 


Jun 14 1988 


155 


Nov 


15 


155 


Nov 15 


21 


Apr 20 1977 








43600 


Jan 20 


71300 


Dec 23 1964 








19.30 


Jan 20 


30.00 


Feb 28 1940 


644600 






1267000 




1012000 




1670 






4410 




3310 




228 






543 




312 




170 






170 




140 





RUSSIAN RIVER BASIN 

11464000 RUSSIAN RIVER NEAR HEALDSBURG, CA— Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. --Water years 1951 to current year. 
CHEMICAL DATA: Water years 1951-66, 1980. 
WATER TEMPERATURE: Water years 1966 to current year. 

PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: October 1965 to current year. 

INSTRUMENTATION. — Temperature recorder since October 1965 provides hourly recordings. 

REMARKS. — Temperature during summer months affected by recreation dams above and below gage. 

EXTREMES FOR PERIOD OF DAILY RECORD.— 

WATER TEMPERATURE: Maximum recorded, 28.0'C, at times in some years; minimum recorded, 3.0'C, Dec. 23, 1990. 

EXTREMES FOR CURRENT YEAR.-- 

WATER TEMPERATURE: Maximum recorded, 26.5*C, June 26 and Aug. 1-3; minimum recorded, 7.0'C, Dec. 30, 
Jan. 3, 4, 11. 

WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN 



247 



DAY 



MAX 



MIN 





OCTOBER 


NOVEMBER 


DECEMBER 


JANUARY 


FEBRUARY 


MARCH 


1 


21.5 


20.0 


19.0 


17.0 


11.5 


10.0 


9.5 


9.0 


11.0 


9.0 


12.0 


10.0 


2 


20.5 


18.0 


19.0 


17.5 


11.5 


10.5 


9.0 


8.0 


10.5 


9.0 


13.5 


11.0 


3 


21.5 


17.5 


18.5 


16.5 


12.0 


10.5 


8.0 


7.0 


11.0 


10.5 


14.0 


12.0 


4 


21.5 


17.5 


18.0 


16.0 


11.0 


10.0 


8.0 


7.0 


12.5 


11.0 


13.5 


11.5 


5 


22.0 


17.5 


18.5 


16.0 


10.0 


9.0 


9.0 


8.0 


12.5 


12.0 


14.0 


11.5 


6 


21.5 


17.5 


18.5 


16.0 


11.0 


10.0 


9.0 


8.5 


12.5 


11.5 


14.5 


12.0 


7 


21.5 


17.5 


18.0 


15.5 


10.0 


9.0 


9.0 


8.5 


12.5 


11.5 


15.0 


13.0 


8 


21.5 


17.0 


16.5 


15.0 


11.0 


8.5 


9.5 


9.0 


13.0 


12.0 


15.0 


13.5 


9 


21.5 


17.5 


15.0 


13.0 


11.5 


10.5 


9.0 


8.5 


12.5 


11.5 


15.0 


13.5 


10 


21.5 


17.5 


14.5 


12.0 


12.5 


11.5 


8.5 


7.5 


12.0 


11.0 


15.0 


13.5 


11 


21.5 


17.5 


14.0 


11.5 


11.5 


10.5 


8.5 


7.0 


11.0 


10.0 


15.5 


13.5 


12 


21.0 


17.5 


14.0 


11.5 


10.5 


9.0 


8.0 


7.5 


11.0 


9.5 


16.0 


14.5 


13 


21.0 


18.0 


14.5 


11.5 


10.0 


8.5 


9.0 


7.5 


11.0 


9.0 


16.0 


14.5 


14 


19.5 


17.5 


14.5 


12.0 


10.5 


9.0 


9.5 


9.0 


11.0 


9.0 


16.0 


14.5 


15 


19.5 


17.0 


14.0 


12.0 


10.5 


9.0 


9.0 


8.5 


11.0 


9.0 


15.5 


14.5 


16 


19. S 


16.5 


15.0 


13.0 


10.5 


9.0 


10.0 


9.0 


10.5 


9.0 


15.0 


14.0 


17 


19.0 


16.0 


16.0 


14.0 


10.5 


10.0 


9.5 


9.0 


10.0 


9.0 


14.5 


13.5 


18 


19.5 


16.5 


14.5 


12.5 


10.0 


8.5 


10.0 


9.0 


10.5 


10.0 


15.5 


13.5 


19 


20.0 


17.0 


14.5 


13.0 


9.5 


8.0 


10.0 


9.0 


11.0 


10.0 


15.0 


13.5 


20 


19.5 


18.5 


13.0 


11.5 


10.0 


9.5 


11.0 


9.5 


10.0 


9.0 


15.5 


13.0 


21 


20.0 


17.5 


13.0 


11.5 


10.5 


10.0 


11.0 


10.0 


10.0 


g.o 


16.0 


13.5 


22 


20.0 


17.0 


14.0 


12.5 


10.0 


9.0 


11.0 


10.5 


10.0 


9.5 


16.0 


14.0 


23 


19.5 


16.5 


13.0 


11.0 


9.5 


9.0 


10.5 


9.5 


10.0 


9.5 


16.0 


14.5 


24 


19.5 


16.5 


12.0 


10.5 


9.5 


9.0 


10.0 


8.5 


10.0 


9.0 


14.5 


13.0 


25 


18.5 


17.5 


13.0 


11.5 


9.5 


9.0 


10.0 


9.0 


9.5 


8.5 


14.0 


12.0 


26 


19.0 


16.5 


13.5 


12.0 


9.0 


8.5 


10.0 


9.0 


10.0 


8.5 


14.0 


12.5 


27 


19.0 


16.5 


14.0 


13.0 


9.0 


8.5 


10.0 


9.0 


11.0 


9.0 


13.5 


12.0 


28 


18.0 


17.0 


13.0 


11.5 


9.5 


9.0 


11.5 


9.5 


12.0 


9.5 


14.0 


11.5 


29 


18.0 


16.5 


12.0 


10.5 


9.0 


7.5 


11.5 


10.5 








15.0 


12.0 


30 


18.0 


17.0 


12.0 


9.5 


8.0 


7.0 


11.5 


10.0 








15.5 


13.0 


31 


17.5 


16.5 





— 


9.5 


7.5 


11.0 


9.5 








15.0 


13.0 



MONTH 22 . 



16.0 



19.0 



9.5 



12.5 



7.0 



11.5 



7.0 



13.0 



8.5 



16.0 



10.0 



248 



RUSSIAN RIVER BASIN 



11A6«000 RUSSIAN RIVER NEAR HEALDSBURG, CA--Continued 
WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



MAY 



JUNE 



JULY 



1 


13.5 


12.0 


2 


U.5 


11.5 


3 


1A.5 


13.0 


4 


15.0 


13.5 


5 


15.0 


13.0 


6 


15.0 


13.0 


7 


16.0 


13.0 


8 


15.5 


14.0 


9 


15.0 


13.0 


10 


15.5 


13.5 


11 


15.0 


13.0 


12 


15.5 


13.0 


13 


16.0 


13.5 


1* 


16.5 


14.0 


15 


17.0 


15.0 


16 


16.0 


14.5 


17 


15.0 


13.5 


18 


15.5 


13.0 


19 


15.5 


12.5 


20 


15.5 


13.5 


21 


16.0 


13.5 


22 


16.5 


14.0 


23 


15.5 


14.0 


24 


16.0 


13.5 


25 


16.5 


14.5 


26 


16.5 


14.5 


27 


17.0 


14.5 


28 


18.0 


15.0 


29 


18.5 


16.0 


30 


18.5 


16.5 


31 









19.0 


16.5 


20.0 


17.5 


18.5 


17.0 


19.0 


15.5 


18.5 


16.5 


19.0 


17.0 


18.0 


15.5 


18.5 


15.5 


20.0 


16.5 


20.5 


18.0 


18.5 


16.5 


17.0 


15.5 


17.0 


15.0 


19.0 


15.5 


20.0 


16.5 


21.0 


17.5 


20.0 


18.0 


18.5 


17.0 


19.0 


17.5 


21.0 


18.0 


20.5 


18.0 


21.5 


18.0 


20.5 


18.0 


18.5 


16.5 


18.5 


16.5 


18.0 


16.5 


17.5 


15.5 


18.0 


16.0 


18.0 


16.0 


18.0 


17,0 


18.5 


16.5 



18.0 


16.5 


19.0 


16.5 


18.5 


16.5 


18.0 


15.0 


17.0 


14.5 


16.5 


15.0 


18.5 


15.0 


20.0 


17.0 


20.5 


17.5 


21.0 


18.5 


20.5 


17.5 


21.5 


18,0 


22.5 


19,0 


23.0 


20,0 


23.0 


20,0 


23.0 


20.0 


24.0 


20.5 


25.0 


21.5 


25.5 


21.5 


24.5 


20.5 


23.5 


19,5 


22.5 


18.0 


23.5 


18.0 


25.0 


19.0 


26,0 


20.5 


26.5 


22.5 


26.0 


22.5 


24.0 


21.5 


24.0 


21.0 


25.0 


21,5 



25.5 


22.0 


25.0 


22.0 


24.5 


21.0 


25.5 


21.5 


25.0 


22.0 


25.0 


22.0 


24.5 


21.5 


24.0 


21.0 


23.5 


21.0 


23.5 


20.5 


24,5 


21.0 


25.0 


21.5 


25.0 


22.0 


24.5 


21.5 


23.5 


20.5 


24.0 


21.0 


24.5 


21,5 


24.5 


22,0 


24.5 


22.0 


24.0 


21.5 


23.5 


21.0 


24.5 


21.0 


25.5 


22.0 


25.5 


23.0 


25.5 


23.0 


24.5 


22.5 


24.0 


22.0 


23.5 


21.5 


24.0 


21.5 


25.0 


22.0 


26.0 


23.0 



MAX 


MIN 


AUGUST 


26.5 


24.5 


26.5 


25.0 


26.5 


24.0 


25.0 


23.0 


24.5 


23.0 


24.5 


23.0 


24.5 


22.5 


23.5 


21.5 


23.5 


21.5 


23.5 


21.5 


24.0 


22.0 


24.0 


22.0 


24.0 


22.5 


24.0 


22.0 


23.5 


22.0 


23.5 


21.5 


24.0 


22.0 


24.0 


22.5 


24.0 


22.5 


23.5 


21.5 


24.0 


22.0 


25.0 


23.0 


25.0 


23.0 


25.0 


23.5 


24.5 


22.5 


24.0 


22.0 


24.0 


22.5 


24.5 


23.0 


24.0 


22.5 


23.5 


22.0 


22,5 


21.0 



MAX 


MIN 


SEPTEMBER 


23.5 


21.5 


24.0 


22.5 


24.0 


23.0 


23.5 


22.5 


23.0 


22.0 


22.5 


21.5 


23.0 


21.0 


23.5 


20.5 


23.5 


20.0 


23.5 


20.5 


23.5 


20.0 


23.0 


20.0 


22.5 


19.5 


20.5 


18.5 


21.0 


18.5 


21.0 


18.5 


21.0 


18.5 


21.0 


18.0 


21.0 


17.5 


22.5 


17.5 


22.0 


18.0 


21.5 


17.5 


22.0 


17.0 


22.0 


16.5 


22.0 


16.5 


22.0 


16.5 


22.5 


17.0 


22.0 


17.5 


22.0 


18.0 


22.0 


17.5 



MONTH 18.5 



11.5 



21.5 



15.0 



26.5 



14.5 



26.0 



20.5 



26.5 



21.0 



24.0 



16.5 



RUSSIAN RIVER BASIN 
11*65000 DRY CREEK BELOW WARM SPRINGS DAM, NEAR GEYSERVILLE. CA 



2Ag 



LOCATION. --Lat 38"43'11", long 122*59'58", in Tzabaco Grant, Sonoma County, Hydrologic Unit 18010110, on right 
bank of outlet channel, 500 ft dovmstream from Warm Springs Dam, 500 ft upstream from county road bridge, and 
5.0 mi west of Geyserville. 



DRAINAGE AREA.— 131 mi" 



WATER-DISCHARGE RECORDS 



PERIOD OF RECORD. --October 1939 to September 1942 (published as "Dry Creek near Healdsburg" ) , October 1981 to 
current year. 

GAGE. — Water-stage recorder and concrete control. Datum of gage is 188.21 ft above sea level (levels by 
U.S. Army Corps of Engineers). Prior to Sept. 30, 1942, nonrecording gage at site 500 ft downstream at 
different datum. 

REMARKS. --No estimated daily discharges. Records good. Flow affected by storage in Lake Sonoma, capacity, 
380,600 acre-ft, beginning October 1983. 

EXTREMES FOR PERIOD OF RECORD . —Maximum discharge, 22,500 ft^/s, Feb. 28, 1940, gage height, 16.9 ft, djtum 
in use; no flow Oct. 1 to Dec. 8, 1939. Maximum discharge since regulation by Lake Sonoma, 4,220 ft /s 
Jan. 23, 1993, gage height, 9.71 ft; minimum daily, 6.3 ft^/s July 10, 1984. 



then 



EXTREMES OUTSIDE PmiOD OF RECORD. --Flood of December 1937 reached a stage of 21.8 ft from floodmarks, discharge 
about 25,000 ft^/s. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 4,220 ft^/s, Jan. 23, gage height, 9.71 ft; minimum dally, 
26 ft^/s. May 24. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR (XTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


106 


113 


110 


92 


1540 


2470 


184 


42 


105 


114 


129 


128 


2 


92 


111 


111 


79 


1030 


1070 


183 


43 


104 


114 


135 


128 


3 


97 


111 


111 


79 


508 


180 


183 


36 


104 


114 


136 


128 


4 


101 


113 


117 


125 


167 


180 


184 


29 


98 


114 


135 


129 


5 


105 


114 


126 


155 


180 


180 


184 


30 


104 


114 


136 


128 


6 


110 


114 


135 


142 


179 


180 


184 


34 


104 


114 


136 


125 


7 


110 


113 


123 


141 


180 


180 


183 


32 


104 


138 


136 


124 


8 


108 


113 


123 


144 


182 


180 


184 


34 


104 


159 


136 


128 


9 


104 


113 


112 


147 


178 


180 


179 


39 


104 


165 


136 


127 


10 


104 


113 


115 


146 


172 


180 


184 


33 


104 


172 


136 


126 


11 


104 


112 


112 


146 


176 


180 


184 


31 


104 


170 


135 


125 


12 


107 


112 


112 


528 


179 


178 


184 


32 


104 


170 


136 


125 


13 


110 


112 


112 


1540 


179 


178 


184 


34 


98 


169 


136 


110 


14 


110 


111 


111 


1850 


179 


178 


185 


32 


105 


169 


136 


111 


15 


110 


111 


111 


1860 


179 


116 


185 


33 


105 


170 


133 


100 


16 


111 


111 


111 


1870 


179 


106 


186 


38 


105 


169 


140 


112 


17 


111 


111 


110 


1870 


185 


107 


186 


31 


103 


169 


141 


117 


18 


105 


110 


110 


1870 


184 


497 


185 


36 


104 


169 


130 


117 


19 


100 


110 


110 


1890 


188 


777 


180 


33 


103 


163 


130 


117 


20 


103 


110 


110 


767 


182 


861 


526 


33 


105 


150 


130 


116 


21 


100 


109 


110 


116 


1210 


861 


703 


32 


105 


111 


130 


116 


22 


101 


109 


111 


116 


1990 


433 


422 


39 


106 


118 


130 


116 


23 


101 


109 


111 


1810 


2530 


181 


178 


41 


102 


119 


130 


108 


24 


101 


109 


111 


2470 


3420 


425 


178 


26 


106 


119 


130 


96 


2S 


101 


108 


111 


2460 


3910 


759 


157 


27 


107 


119 


129 


97 


26 


100 


108 


110 


2110 


3140 


426 


102 


165 


107 


120 


130 


96 


27 


101 


109 


110 


2400 


2480 


187 


39 


166 


107 


123 


131 


64 


28 


101 


110 


112 


2790 


2470 


185 


31 


176 


119 


128 


130 


47 


29 


95 


110 


111 


3070 





185 


33 


134 


119 


129 


129 


46 


30 


89 


110 


111 


2690 





175 


35 


109 


111 


126 


129 


46 


31 


90 




122 


2640 





185 





93 


... 


125 


124 





TOTAL 


3188 


3329 


3522 


38113 


27276 


12160 


5915 


1693 


3160 


4323 


4120 


3253 


MEAN 


103 


111 


114 


1229 


974 


392 


197 


54.6 


105 


139 


133 


108 


MAX 


111 


114 


135 


3070 


3910 


2470 


703 


176 


119 


172 


141 


129 


MIN 


89 


108 


110 


70 


167 


106 


31 


26 


98 


111 


124 


46 


AC-FT 


6320 


6600 


6990 


75600 


54100 


24120 


11730 


3360 


6270 


8570 


8170 


6450 



250 



RUSSIAN RIVER BASIN 



11*65000 DRY CREEK BELCW WARM SPRINGS DAM, NEAR GEYSERVILLE, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1984 



OCT 



NOV 



DEC 



JAN 



FEB 



1993, BY WATER YEAR (WY) 

MAR AFR MAY JUN 



JUL 



AUG 



SEP 



MEAN 67.6 175 


239 


264 


183 


272 


100 




72.9 


101 


118 


104 


82.8 


MAX 104 524 


1501 


1229 


974 


1089 


263 




161 


196 


274 


169 


122 


(WY) 1989 1984 


1984 


1993 


1993 


1986 


1984 




1984 


1987 


1987 


1987 


1988 


MIN 7.70 50.8 


49.8 


49.3 


73.3 


25.0 


23.0 




26.1 


25.1 


27.0 


42.0 


39.0 


(WY) 1984 1986 


1986 


1986 


1966 


1965 


1985 




1965 


1985 


1985 


1985 


1985 


SUMMARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 


WATER YEAR 




WATER YEARS 1984 - 


1993 


ANNUAL TOTAL 




34623 






110052 














ANNUAL MEAN 




95.1 






302 








148 






HIGHEST ANNUAL MEAN 


















302 




1993 


LOWEST ANNUAL MEAN 


















46.0 




1985 


HIGHEST DAILY MEAN 




135 


Dec 6 




3910 




Fob 25 




3910 


Feb 25 


1993 


LOWEST DAILY MEAN 




27 


May 22 




26 




May 24 




6.1 


Oct 21 


1983 


ANNUAL SEVEN-DAY MINIMUM 




29 


May 22 




33 




May 4 




6.3 


Oct 18 


1963 


INSTANTANEOUS PEAK FLOW 










4220 




Jan 23 




4220 


Jan 23 


1993 


INSTANTANEOUS PEAK STAGE 










9. 


71 


Jan 23 




9.71 


Jan 23 


1993 


ANNUAL RUNOFF (AC-FT) 




69070 






218300 








107500 






10 PERCENT EXCEEDS 




117 






515 








179 






50 PERCENT EXCEEDS 




105 






119 








93 






90 PERCENT EXCEEDS 




71 






80 








32 







RUSSIAN RIVER BASIN 251 

11465000 DRY CREEK BELOW WARM SPRINGS DAM, NEAR GEYSERVILLE, CA— Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD.— 

WATER TEMPERATURE: November 1981 to current year. 

PERIOD OF DAILY RECORD. -- 

WATER TEMPERATURE: November 1981 to current year. 

INSTRUMENTATION . — Temperature recorder . 

REMARKS. — Water temperature Is affected by regulation from Warm Springs Dam. Interruptions in record were due to 
malfunction of recording instrument. 

EXTREMES FOR PERIOD OF DAILY RECORD.— 

WATER TEMPERATURE: Maximum recorded, 27.0*C, several days in 1983; minimum recorded, 6.5'C, Jan. 20, 1982. 

EXTREMES FOR CURRENT YEAR.— 

WATER TEMPERATURE: Maximum recorded, 16.S*C, May 9; minimum recorded, 9.S*C, several days in January. 



WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DAY 



MAX 



MIN 





OCTOBER 


1 


12.5 


12.0 


2 


12.0 


11.5 


3 


12.5 


11.5 


4 


12.5 


11.5 


5 


12.0 


11.5 


6 


12.0 


11.0 


7 


12.0 


11.5 


8 


12.0 


11.5 


9 


12.0 


11.5 


10 


12.0 


11.5 


11 


12.0 


11.5 


12 


12.0 


11.5 


13 


12.0 


11.5 


14 


12.0 


11.0 


15 


12.0 


11.5 


16 


12.0 


11.5 


17 


12.0 


11.5 


18 


12.0 


11.5 


19 


12.0 


11.5 


20 


11.5 


11.5 


21 


12.0 


11.5 


22 


12.0 


11.5 


23 


12.0 


11.5 


24 


12.0 


11.5 


2S 


12.0 


11.5 


26 


12.0 


11.5 


27 


12.0 


11.5 


28 


12.0 


11.5 


29 


12.0 


11.5 


30 


12.0 


11.5 


31 


12.0 


11.5 



MAX 


MIN 


NOVEMBER 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


12.0 


11.5 


11.5 


11.5 


11.5 


11.5 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.5 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 



11.5 
11.5 
11.5 



11.0 
11.0 
11.0 



MAX 



MIN 



DECEMBER 



11.5 


11.0 


11.0 


11.0 


11.5 


11.0 


11.5 


11.0 


11.0 


11.0 


11.0 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.5 


11.0 


11.0 


11.0 


11.0 


11.0 


11.0 


10.5 


11.0 


11.0 


11.0 


11.0 


11.0 


10.5 


11.0 


11.0 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


11.0 


11.5 


11.0 


11.0 


11.0 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


11.0 


10.5 


10.5 


10.0 



MAX 


MIN 


JANUARY 


11.0 


10.5 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.5 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


9.5 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


9.5 


10.0 


9.5 


10.0 


9.5 


9.5 


9.5 


11.0 


9.5 



11.0 



10.0 



10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.5 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 



MAX 


MIN 


FEBRUARY 


10.5 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.0 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 



MAX 



MIN 



MARCH 



10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


11.0 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 



11.0 



10.5 



10.5 



10.5 


10.0 


11.0 


10.5 


10.5 


10.0 



10.0 



10.5 


10.0 


10.5 


10.0 


10.5 


10.0 


10.0 


10.0 


10.5 


10.0 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 


10.5 



MONTH 12.5 



11.0 



11.5 



10.0 



10.5 



10.0 



2S2 



RUSSIAN RIVER BASIN 



11465000 DRY CREEK BELOW WARM SPRINGS DAM. NEAR GEYSERVILLE. CA--Continued 
WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DAY 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



MAX 



MIN 



APRIL 



1 


10.5 


10.5 


2 


10.5 


10.5 


3 


10.5 


10.5 


4 


10.5 


10.0 


5 


10.5 


10.0 


6 


10.5 


10.0 


7 


10.5 


10.0 


8 


10.5 


10.0 


9 


10. S 


10.0 


10 


10.5 


10.0 


11 


10.5 


10.0 


12 








13 


10. s 


10.0 


14 


10. s 


10.0 


IS 


10.5 


10.0 


16 


10. S 


10.0 


17 


10.5 


10.0 


18 


10.5 


10.0 


10 


10.5 


10.0 


20 


10.5 


10.0 


21 


10.0 


10.0 


22 


11.0 


10.0 


23 


10.5 


10.0 


24 


10.5 


10.0 


2S 


10.5 


10.0 


26 


14.5 


10. s 


27 


15.5 


11.5 


28 


16.0 


11.5 


29 


16.0 


12.0 


30 


IS.O 


11.5 


31 









MAY 



15.0 


12.0 


13.5 


12.0 


15.0 


11.0 


15.0 


11.5 


15.0 


11.5 


14.5 


11.5 


15.0 


11.5 


15.5 


11.5 


16.5 


12.0 


13.5 


12.0 


13.0 


11.0 


13.0 


11.0 


14.0 


11.0 


15.0 


11.5 


14.0 


12.0 


13.0 


11.5 


15.0 


11.5 



15.5 



16.0 
11.5 



11.5 



11. 
11. 



JUNE 



JULY 



12.0 



11.5 



12.0 


11.5 


12.0 


11.5 


12.5 


11.5 


12.5 


11.5 


12.5 


11.5 


12.0 


11.5 


12.0 


11.5 


12.5 


11.5 


12.5 


11.5 


12.5 


11.5 


13.0 


12.0 


13.5 


12.0 


13.5 


12.0 


13.5 


12.0 


13.0 


11.5 


13.0 


11.5 


13.0 


12.0 


13.0 


12.0 


14.0 


12.0 


14.5 


12.0 


14.5 


12.0 



AUGUST 



15.0 


12.0 


13.5 


12.0 


13.5 


12.0 


13.5 


12.0 


13.5 


12.5 


14.0 


12.5 


13.5 


12.0 


13.5 


12.0 


14.0 


12.0 


14.5 


12.5 


14.5 


12.5 


14.0 


12.5 


14.0 


12.5 


14.0 


12.5 


14.5 


12.5 


13.5 


12.0 


15.0 


12.5 


14.5 


12.5 


15.0 


12.5 


15.0 


12.5 


15.0 


12.5 


15.5 


12.5 


15.0 


13.0 


15.0 


13.0 


14.5 


12.5 


14.5 


12.5 


14.5 


12.5 


14.5 


12.5 


14.5 


12.5 


14.5 


12.5 


14.5 


12.5 



MAX 


MIN 


SEPTEMBER 


14.5 


13.0 


15.0 


13.0 


14.5 


13.0 


14.5 


13.0 


14.5 


13.0 


14.5 


13.0 


15.0 


12.5 


15.0 


13.0 


15.0 


13.0 


14.5 


13.0 


15.0 


13.5 


15.0 


13.0 


15.5 


13.0 


14.0 


13.0 


15.0 


13.0 


15.0 


13.0 


15.0 


13.5 


15.0 


13.0 


15.0 


13.0 


15.5 


13.5 


15.0 


13.5 


15.0 


13.0 


15.5 


13.5 


16.0 


13.0 


15.5 


13.5 


15.5 


13.5 


15.5 


13.5 


15.5 


13.0 


15.0 


13.0 


15.0 


13.0 



MONTH 



15.5 



12.0 



16.0 



12.5 



RUSSIAN RIVER BASIN 



253 



11465200 DRY CREEK NEAR GEYSERVILLE, CA 

LOCATION. --Lat 38'41'55", long 122"57'25", in Tzabaco Grant, Sonoma County, Hydrologic Unit 18010110, on left 
bank pier of bridge 0.3 ml downstream from Pena Creek, 3.0 mi downstream from Warm Springs Dam, and 3 ml west 
of Geyservllle. 

DRAINAGE AREA.— 162 mi^. 

PERIOD OF RECORD. — October 1959 to current year. 
CHEMICAL DATA: Water years 1971-81. 
WATER TEMPERATURE: Water years 1964-86. 
SEDIMENT DATA: Water years 1964-87. 
TURBIDITY: Water years 1964-85. 

REVISED RECORDS. --WDR CA-65-1: 1962(M), 1963(M). 

GAGE. — Water-stage recorder. Datum of gage is 156.40 ft above sea level. Prior to Oct. 1, 1964, at datum 
4.00 ft higher. Oct. 1, 1964, to Apr. 8, 1976, at datum 3.00 ft higher; Apr. 9, 1976, to Sept. 30, 1982, 
at datum 2.00 ft higher. 



REMARKS .- -Records poor. Small diversions upstream from station for irrigation of about 1,200 acres. Flow 
affected by storage in Lake Sonoma, 3.0 mi upstream, capacity 380,600 acre-ft, beginning October 1983. 



EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 32,400 ft^/s, Jan. 31, 1963, gage height, 
datum; no flow at times. Maximum discharge since regulation by Lake Sonoma, 6,960 ft /s, 
13.49 ft, Jan. 20, 1993; minimum daily, 19 ft^/s, Oct. 18-25, 1984. 



20.50 ft, present 
gage height. 



EXTREMES FOR CURRENT YEAR. --Maximum discharge, 6,960 ff'/s, Jan. 20, gage height, 13.49 ft; minimum daily, 
33 ft^/s. May 17. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


Ill 


110 


110 


1180 


1990 


2910 


214 


43 


207 


126 


130 


el32 


2 


91 


112 


116 


402 


1310 


1480 


209 


42 


205 


125 


136 


el32 


3 


92 


109 


112 


242 


722 


313 


207 


40 


203 


125 


136 


el33 


4 


98 


112 


116 


222 


217 


271 


206 


40 


202 


125 


136 


el34 


S 


103 


116 


130 


249 


213 


246 


186 


39 


177 


124 


136 


el34 


6 


112 


114 


257 


349 


201 


239 


188 


41 


167 


124 


136 


el31 


7 


113 


116 


184 


752 


201 


230 


188 


40 


150 


144 


134 


el31 


8 


112 


114 


341 


492 


314 


220 


183 


36 


148 


178 


136 


el33 


9 


105 


114 


408 


377 


275 


217 


171 


39 


145 


176 


136 


el33 


10 


104 


113 


721 


331 


291 


212 


173 


37 


139 


176 


136 


el33 


11 


107 


113 


356 


289 


412 


209 


171 


36 


138 


176 


136 


el33 


12 


111 


112 


206 


574 


339 


204 


169 


37 


136 


175 


136 


el28 


13 


117 


112 


151 


2270 


310 


203 


166 


38 


135 


174 


136 


101 


14 


118 


113 


131 


2960 


285 


201 


164 


37 


134 


174 


136 


98 


15 


118 


113 


121 


2870 


266 


146 


162 


35 


134 


173 


el33 


90 


16 


117 


113 


113 


2740 


251 


143 


159 


36 


132 


172 


el40 


101 


17 


116 


113 


111 


2510 


571 


262 


241 


33 


132 


174 


el41 


110 


18 


109 


113 


107 


2430 


1100 


675 


201 


42 


130 


174 


el30 


109 


19 


99 


113 


104 


62900 


1670 


963 


178 


44 


126 


174 


el30 


109 


20 


106 


113 


103 


3750 


1140 


1080 


438 


43 


129 


151 


el30 


110 


21 


104 


114 


101 


1540 


1670 


1070 


740 


41 


128 


120 


el30 


111 


22 


103 


115 


99 


1090 


2520 


399 


487 


45 


127 


120 


el30 


111 


23 


103 


113 


98 


2160 


3250 


249 


160 


47 


127 


120 


el30 


102 


24 


102 


111 


97 


2910 


4030 


629 


157 


41 


127 


120 


el30 


81 


25 


102 


109 


95 


2850 


4460 


910 


141 


40 


126 


120 


el30 


80 


26 


102 


113 


93 


2490 


3660 


362 


112 


593 


127 


120 


el31 


81 


27 


103 


113 


92 


2760 


2900 


234 


91 


1140 


126 


122 


el32 


60 


28 


104 


108 


152 


3010 


2900 


220 


57 


424 


126 


126 


el32 


42 


29 


106 


112 


299 


3320 





212 


44 


215 


122 


132 


el32 


41 


30 


91 


110 


220 


3010 





202 


42 


208 


126 


126 


el32 


41 


31 


84 





1550 


3030 





219 





218 





126 


el28 





TOTAL 


3263 


3376 


6894 


56059 


37468 


15130 


6005 


3790 


4331 


4492 


4137 


3165 


MEAN 


105 


113 


222 


1808 


1338 


488 


200 


122 


144 


145 


133 


105 


MAX 


118 


116 


1550 


3750 


4460 


2910 


740 


1140 


207 


178 


141 


134 


MIN 


84 


108 


92 


222 


201 


143 


42 


33 


122 


120 


128 


41 


AC-FT 


6470 


6700 


13670 


111200 


74320 


30010 


11910 


7520 


8590 


8910 


8210 


6280 


e Estimated. 

























2S4 



RUSSIAN RIVER BASIN 



11A65200 DRY CREEK NEAR GEYSERVILLE, CA--Contlnued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 - 1983, BY WATER YEAR (WY) 



OCT 



HOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAH 


22. S 


240 


610 


1178 


959 


666 


3A5 


80.3 


23.3 


6.01 


1.70 


1.35 


MAX 


323 


1619 


2D3S 


3930 


2038 


3095 


H99 


369 


76.0 


20.9 


8.91 


8.61 


(V») 


1963 


1974 


1965 


1970 


1983 


1983 


1982 


1983 


1983 


1983 


1983 


1983 


HOI 


.000 


.34 


4.31 


22.7 


27.1 


3A.1 


9.58 


5.64 


.25 


.000 


.000 


.000 


(WY) 


1961 


1981 


1977 


1976 


1977 


1977 


1977 


1977 


1977 


1977 


1972 


1972 



SUhMARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



WATER YEARS 1960 - 1983 



342 








790 






1983 


8.81 






1977 


19400 


Jan 


16 


1974 


.00 


Sep 


17 


1960 


.00 


Sep 


17 


1960 


32400 


Jan 


31 


1963 


20.50 


Jan 


31 


1963 


;47800 








868 








32 








.08 









STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 1993. BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


79.8 


143 


137 


378 


383 


471 


104 


82.6 


122 


143 


120 


92.8 


MAX 


107 


459 


232 


1808 


1338 


1455 


200 


122 


199 


296 


180 


128 


(Vff) 


1989 


1987 


1988 


1993 


1993 


1986 


1993 


1993 


1987 


1987 


1987 


1988 


MIN 


42.2 


60.4 


88.2 


83.0 


85.4 


86.0 


38.5 


36.6 


93.5 


96.9 


96.1 


44.1 


(WY) 


1991 


1986 


1991 


1991 


1991 


1988 


1990 


1991 


1989 


1990 


1990 


1991 



SUmARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1986 - 1993 



47447 






148110 








130 






406 




187 
406 
90.5 


1993 
1990 


1550 


Dec 


31 


4460 


Feb 25 


4460 


Feb 25 1993 


27 


May 


20 


33 


May 17 


27 


May 20 1992 


29 


May 


17 


36 


May 11 


29 


May 17 1992 








6960 


Jan 20 


6960 


Jan 20 1993 








13.49 


Jan 20 


13.49 


Jan 20 1993 


94110 






293800 




135700 




160 






1090 




267 




107 






133 




104 




74 






88 




49 





RUSSIAN RIVER BASIN 
11A6S3S0 DRY CREEK NEAR MOUTH, NEAR HEALDSBURG, CA 



255 



LOCATION.— Lat 38*35'15", long 122*51'40", in Sotoyome Grant, Sonoma County, Hydrologlc Unit 18010110, on right 
bank 0.25 mi upstream from mouth, 0.4 mi downstream from Mill Creek, 1.7 mi south of Bealdsburg, and 13.5 mi 
downstream from Warm Springs Dam. 

DRAINAGE AREA.— 217 ml^. 

PERIOD OF RECORD. — November 1980 to current year (low flow only). 

GAGE. — Water-stage recorder. Elevation of gage is SO ft above sea level, from topographic map. 

RQIARKS. — Records fair. No records computed above 200 ft /s. Some diversions for irrigation upstream from 
station. Flow regulated by Lake Sonoma 13.5 mi upstream beginning October 1983. 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



1 


91 


80 


95 


2 


80 


91 


128 


3 


72 


91 


111 


^ 


73 


91 


97 


s 


75 


93 


99 


6 


79 


94 





7 


83 


95 





8 


83 


94 





9 


81 


95 





10 


77 


95 





11 


76 


96 





12 


76 


96 





13 


80 


94 





14 


85 


94 





IS 


88 


04 


184 


16 


88 


94 


161 


17 


88 


94 


150 


18 


88 


95 


141 


19 


79 


96 


134 


20 


83 


96 


130 


21 


84 


96 


127 


22 


80 


96 


122 


23 


80 


06 


118 


24 


78 


95 


117 


25 


78 


92 


114 


26 


78 


94 


113 


27 


78 


96 


111 


28 


78 


97 





29 


97 


95 





30 


80 


95 





31 


73 


--- 




TOTAL 


2509 


2820 





MEAN 


80.9 


94.0 





MAX 


97 


97 





MIN 


72 


80 





AC-FT 


4980 


5590 





e Estimated. 







SEP 






143 





127 


108 


144 





131 





123 


115 


139 





124 





121 


122 


139 





110 





119 


123 


150 





elOl 





121 


127 


145 





e96 





119 


127 


143 





aSO 





132 


129 


139 





•83 





199 


130 


129 





•79 








129 


133 


— 


•75 








127 


136 





■70 


. 





124 


135 





•59 








120 


138 





54 





200 


119 


126 





53 


191 


106 


129 


93 





47 


186 


193 


124 


87 


— 


51 


185 


189 


128 


96 





51 


176 


192 


144 


100 





44 


161 


188 


125 


116 





57 


153 


190 


119 


116 


— 


63 


159 


172 


119 


117 


. 


50 


157 


123 


120 


115 





46 


151 


103 


130 


114 





57 


149 


97 


134 


114 





64 


144 


95 


136 


77 


— 


42 


134 


98 


135 


68 


191 


..- 


133 


101 


133 


64 


156 





133 


102 


138 


55 


121 





131 


118 


132 


16 


142 





125 


121 


137 


7.8 


158 





129 


112 


144 


6.9 











108 


133 

















3960 


3177.7 














128 


106 














144 


150 














108 


6.9 














7850 


6300 



256 RUSSIAN RIVER BASIN 

11*66500 LAGUNA DE SANTA ROSA NEAR GRATON, CA 

LOCATION. --Lat 38'27'10", long 122' 50 '03", in Molinos Grant, Sonoma County, Hydrologic Unit 18010110, on 
downstream side of left bank pier of highway bridge, 0.2 mi downstream from Santa Rosa Creek, and 2 mi 
northeast of Graton. 

PERIOD OF RECORD. --February 1940 to September 1949 (contents only), October 1964 to current year. 

GAGE. --Water-stage recorder. Datum of gage is sea level (levels by U.S. Army Corps of Engineers). Prior to 
Dec. 31, 1956, at site 75 ft downstream at same datum. 

RD1ARKS. --The laguna is a natural water channel and overflow basin connecting Santa Rosa Creek, Mark West Creek, 
and other smaller creeks with the Russian River. During floods, directions of flow may be either to or from 
the Russian River, and the laguna acts as a natural regulator of floods on the lower Russian River. Figures 
given represent only those days when the elevation was above 55.0 ft. 

EXTREMES FOR PERIOD OF RECORD. --Maximum elevation, 74.6 ft, Feb. 18, 1986. 

EXTREMES FOR CURRENT YEAR. --Maximum elevation, 64.7 ft, Jan. 21. 

ELEVATION (FEET), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY OBSERVATION AT 2400 HOURS 

DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 

2 
3 
4 
3 

6 
7 

8 

9 

10 

11 
12 
13 
14 
15 

16 
17 
18 
19 

20 

21 
22 
23 
24 

25 

26 
27 
28 
29 

30 

31 

MAX 

MIN 






59.6 











57.5 











56.2 











55.5 











55.1 











56.4 











57.5 








56.4 


56.6 








57.6 


55.9 








59.0 


55.4 


55.7 





57.8 


55.0 


56.1 





56.6 


56.4 


55.5 





55.8 


60.0 


55.0 





55.1 


59.1 











57.9 











57.0 











56.7 


55.5 


55.7 





56.4 


57.1 


55.8 





56.2 


58.2 


55.2 





64.4 


57.6 








64.3 


56.4 








61.3 


56.7 








58.0 


59.6 








56.4 


57.7 








55.8 


56.2 








55.3 


55.6 


... 


— - 


55. 


55.2 





55.0 








... 


55.7 











56.8 












RUSSIAN RIVER BASIN 



257 



ll^eTOOO RUSSIAN RIVER NEAR GUERNEVILLE. CA 
(National Stream Quality Accounting Network Station) 

LOCATION.— Lat 38'30'31", long 122*55'36", in NE 1/A SE 1/4 sec.26, T.8 N.. R.IO W. , Sonoma County, Hydrologic 
Unit 18010110, on right bank at dovmstream side of Hacienda Bridge, 0.1 mi upstream from Hobson Creek, and 
3.8 ml east of Guemeville. 



DRAINAGE AREA.— 1,338 mi - 



WATER-DISCHARGE RECORDS 



PERIOD OF RECORD. — October 1939 to current year. 
WSP 1315-B. Prior to October 1954. published 



Monthly discharge only for some periods, published in 
IS "at Guemeville." 



REVISED RECORDS. --WSP 1395: Drainage area at former site. WSP 1929: Drainage area. 

GAGE. --Water-Stage recorder. Datum of gage is 20.14 ft above sea level. Prior to Oct. 1, 1954, nonrecording 
gage at bridge 5.3 mi downstream at datum 8.58 ft lower. Oct. 1. 1954, to Oct. 23, 1974, at site . 7 mi 
downstream at datum 2.75 ft lower. Supplementary water-stage recorder 2 . 1 mi downstream used during periods 
of low flow, 1948-54. 

REMARKS. --No estimated daily discharges. Records good. Flow regulated by Lake Mendocino 77 ml upstream, 

beginning November 1958, and by Lake Sonoma 26 mi upstream, beginning October 1983. Many diversions upstream 
from station for irrigation of about 29,000 acres. Flow also affected by diversion into basin (see REMARKS 
for East Fork Russian River stations), and by diversion for municipal use at Wohler Pumping Plant 4.0 mi 
upstream beginning in May 1959. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 102,000 ft^/s, Feb. 18, 1986, gage height, 48.56 ft, from 

rating curve extended above 39,000 ft /s; maximum gage height, 49.7 ft, Dec. 23, 1955, site and datum then in 
use, from floodmarks; minimum daily discharge, 0.75 ft /s. May 6, 1977. 



EXTREMES FOR CURRENT YEAR. 
130 ft^/s, Sept. 30. 



-Maximum discharge, 55.100 ft /s, Jan. 21, gage height, 37.79 ft; minimum daily. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


164 


429 


226 


31900 


6040 


6780 


2210 


1030 


1740 


382 


235 


223 


2 


181 


404 


280 


22700 


4360 


5990 


2140 


937 


1510 


388 


227 


199 


3 


192 


399 


713 


11300 


3820 


4140 


1940 


886 


1370 


346 


220 


198 


4 


206 


369 


491 


8670 


2840 


3580 


1820 


884 


1410 


344 


203 


197 


5 


203 


344 


414 


6980 


2540 


3100 


1720 


847 


1870 


351 


217 


202 


6 


187 


325 


722 


5660 


2450 


2770 


1620 


813 


1760 


336 


222 


187 


7 


184 


308 


2710 


10500 


2470 


2520 


1530 


851 


1600 


338 


224 


283 


8 


183 


297 


2580 


10600 


3630 


2300 


1470 


842 


1410 


346 


227 


266 


9 


183 


278 


12400 


7750 


4240 


2140 


1560 


821 


1280 


363 


229 


187 


10 


184 


220 


13300 


7130 


3770 


1980 


1500 


800 


1180 


344 


245 


193 


11 


181 


221 


17500 


6260 


7060 


1850 


1410 


761 


994 


335 


254 


181 


12 


179 


208 


8640 


5200 


6360 


1730 


1330 


619 


757 


319 


229 


181 


13 


180 


220 


5170 


12000 


4920 


1640 


1260 


666 


742 


314 


230 


205 


14 


173 


226 


3240 


20500 


4210 


1570 


1290 


601 


698 


294 


226 


156 


15 


165 


231 


2300 


21300 


3680 


1520 


1350 


592 


655 


290 


249 


164 


16 


176 


237 


1760 


20800 


3310 


1460 


1320 


587 


692 


311 


218 


191 


17 


178 


273 


1470 


14500 


4380 


3810 


2020 


571 


676 


289 


231 


177 


18 


183 


251 


1290 


12400 


12100 


4960 


3190 


561 


678 


307 


232 


191 


19 


163 


237 


1160 


9890 


19500 


4520 


2660 


545 


648 


294 


218 


208 


20 


175 


250 


1030 


29500 


25000 


3800 


2220 


632 


541 


285 


212 


218 


21 


318 


261 


969 


52600 


16300 


3350 


2210 


621 


480 


284 


225 


210 


22 


249 


275 


919 


41200 


13800 


2960 


2010 


591 


465 


262 


236 


179 


23 


230 


279 


830 


23200 


19700 


2400 


1550 


574 


443 


262 


196 


190 


24 


217 


243 


762 


16100 


23200 


3970 


1600 


601 


412 


245 


202 


209 


25 


213 


278 


701 


13400 


17400 


4200 


1550 


657 


347 


232 


226 


183 


26 


196 


272 


652 


11400 


14100 


3480 


1370 


810 


298 


213 


197 


169 


27 


194 


265 


616 


9890 


9860 


2790 


1290 


2270 


377 


211 


199 


158 


28 


195 


264 


1070 


8400 


7660 


2740 


1250 


2140 


400 


235 


196 


167 


29 


373 


264 


3390 


7660 





2410 


1180 


1460 


422 


235 


195 


155 


30 


422 


240 


5080 


6960 





2130 


1100 


1170 


398 


255 


192 


130 


31 


436 





8110 


6520 





2010 





1270 





214 


205 





TOTAL 


6663 


8368 


100495 


472870 


248700 


94600 


50670 


27010 


26253 


9224 


6817 


5757 


MEAN 


215 


279 


3242 


15250 


8882 


3052 


1689 


871 


875 


298 


220 


192 


MAX 


436 


429 


17500 


52600 


25000 


6780 


3190 


2270 


1870 


388 


254 


283 


MIN 


163 


208 


226 


5200 


2450 


1460 


1100 


545 


298 


211 


192 


130 


AC-FT 


13220 


15600 


199300 


937900 


493300 


187600 


100500 


53570 


52070 


18300 


13520 


11420 



2SB 



RUSSIAN RIVER BASIN 
11467000 RUSSIAN RIVER NEAR GUERNEVILLE. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAM 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 319 1249 


4147 


6577 


6592 


4475 


2328 


699 


294 


176 


167 


183 


MAX 2S1S 9425 


17410 


25210 


26020 


23290 


11700 


2798 


875 


348 


308 


344 


(WY) 1963 1974 


1956 


1970 


1958 


1983 


1982 


1983 


1993 


1987 


1961 


1961 


MIH 25. 3 140 


116 


127 


88.2 


201 


48.2 


39.0 


22.6 


32.0 


36.7 


35.9 


(WY) 1978 1940 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


1977 


SUhHARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 


WATER YEAR 




WATER YEARS 1940 - 


1993 


ANNUAL TOTAL 




498309 






1057427 












ANNUAL MEAN 




1361 






2897 






2248 






HIGHEST ANNUAL MEAN 
















5898 




1983 


LOWEST ANNUAL MEAN 
















88.7 




1977 


HIGHEST DAILY MEAN 




24700 


Fab 20 




52600 


Jan 21 




97700 


Feb 18 


1986 


LOWEST DAILY MEAN 




141 


May 30 




130 


Sap 30 




.75 


May 6 


1977 


ANNUAL SEVEN-DAY MINIMUM 




158 


Sep 24 




167 


Sep 24 




5.9 


Jul 29 


1977 


INSTANTANEOUS PEAK FLOW 










55100 


Jan 21 




102000 


Feb 18 


1986 


INSTANTANEOUS PEAK STAGE 










37. 


79 Jan 21 




49.70 


Dec 23 


1955 


ANNUAL RUNOFF (AC-FT) 




988400 






2097000 






1629000 






10 PERCENT EXCEEDS 




2670 






8230 






5370 






50 PERCENT EXCEEDS 




278 






652 






352 






90 PERCENT EXCEEDS 




176 






193 






139 







RUSSIAN RIVER BASIN 



259 



11467000 RUSSIAN RIVER NEAR GUERNEVILLE, CA--Continued 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. — Water years 1951 to current year. 

CHEMICAL DATA: Water years 1951 to current year. Published as "at Guemeville" in 1961-65. 

BIOLOGICAL DATA: Water years 1975-81. 

SPECIFIC CONDUCTANCE: Water years 197A-81. 

WATER TEMPERATURE: Water years 1964 to current year. 

SEDIMENT DATA: Water years 1966 to current year. 

PERIOD OF DAILY RECORD. -- 

SPECIFIC CONDUCTANCE: October 1973 to September 1981. 

WATER TEMPERATURE: January 1964 to current year. 

SUSPENDED-SEDIMENT DISCHARGE: April to September 1967, October 1969 to September 1986. 

WATER-QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



TIME 



DIS- 




PH 






BARO- 




OXYGEN, 


COLI- 


STREP- 


CHARGE, 


SPE- 


WATER 






METRIC 




DIS- 


FORM, 


TOCOCCI 


INST. 


CIFIC 


WHOLE 






PRES- 




SOLVED 


FECAL, 


FECAL, 


CUBIC 


CON- 


FIELD 


TEMPER- 


TUR- 


SURE 


OXYGEN, 


(PER- 


0.7 


KF AGAR 


FEET 


DUCT- 


(STAND- 


ATURE 


BID- 


(»1 


DIS- 


CENT 


UM-MF 


(COLS. 



PER 



ANCE 



ARD 



WATER 



ITY 



SECOND (US/CM) UNITS) (DEG C) (NTU) 



OF 
HG) 



SOLVED SATUR- (COLS./ 



PER 



(MG/L) ATION) 100 ML) 100 ML) 



NOV 

17.. 
JAN 

26.. 
MAR 

17.. 
MAY 

24.. 
JUL 

12.. 
SEP 

21.. 



DATE 



1215 274 

1215 11900 

1100 4190 

1330 585 

Ills 339 

1115 223 



HARD- 
NESS 
TOTAL 
(MG/L 
AS 



249 
165 
181 
267 
244 
247 



HARD- 
NESS 
NONCARB CALCIUM 



DISSOLV 

FLD. AS 

CAC03 



DIS- 
SOLVED 
(MG/L 



8.2 


13.5 


0.70 


7.9 


9.5 


87 


7.9 


13.5 


77 


8.2 


19.5 


2.4 


8.2 


21.0 


0.40 


8.2 


18.5 


3.2 



MAGNE- 
SIUM, 
DIS- 



SODIUM, 
DIS- 



SOLVED SOLVED 



(MG/L 



(MG/L 



763 


10.3 


99 


K33 


K13 


762 


10.6 


93 


K190 


400 


762 


9.6 


92 


24000 


36000 


766 


8.8 


95 


20 


27 


765 


8.4 


94 


K16 


K12 


764 


8.6 


92 


K79 


K30 






BICAR- 


CAR- 


ALKA- 


SODIUM 


POTAS- 


BONATE 


BONATE 


LINITY 


AD- 


SIUM, 


WATER 


WATER 


WAT DIS 


SORP- 


DIS- 


DIS IT 


DIS IT 


TOT IT 


TION 


SOLVED 


FIELD 


FIELD 


FIELD 



CAC03) (MG/L) AS CA) AS MG) AS NA) PERCENT 



SODIUM RATIO 



(MG/L MG/L AS MG/L AS MG/L AS 



AS K) 



HC03 



C03 



CAC03 



NOV 

17.. 
JAN 

26.. 
MAR 

17.. 
MAY 

24.. 
JUL 

12.. 
SEP 

21.. 



110 
76 
75 

120 
110 
110 






22 


1 


16 


3 


15 


1 


24 





22 


2 


24 



13 


11 


8.7 


6.8 


9.0 


7.4 


14 


9.9 


13 


8.9 


12 


8.6 



18 
16 
17 
15 
15 
14 

SOLIDS, SOLIDS, 



0.5 


1.1 


0.3 


1.3 


0.4 


1.9 


0.4 


1.3 


0.4 


1.1 


0.4 


1.1 







CHLO- 


FLUO- 


SILICA, 


RESIDUE 


SUM OF 


SOLIDS, 




SULFATE 


RIDE, 


RIDE, 


DIS- 


AT 180 


CONSTI- 


DIS- 




DIS- 


DIS- 


DIS- 


SOLVED 


DEG. C 


TUENTS, 


SOLVED 




SOLVED 


SOLVED 


SOLVED 


(MG/L 


DIS- 


DIS- 


(TONS 


DATE 


(MG/L 


(MG/L 


(MG/L 


AS 


SOLVED 


SOLVED 


PER 




AS S04) 


AS CD 


AS F) 


SI02) 


(MG/L) 


(MG/L) 


AC-FT) 


NOV 
















17... 


15 


7.9 


0.10 


11 


139 


147 


0.19 


JAN 
















26... 


9.1 


4.6 


0.10 


14 


106 


108 


0.14 


MAR 
















17... 


11 


5.9 


<0.10 


13 


110 


109 


0.15 


MAY 
















24... 


15 


7.6 


0.10 


14 


154 


157 


0.21 


JUL 
















12... 


13 


5.7 


0.20 


12 


143 


143 


0.19 


SEP 
















21. .. 


13 


5.9 


0.10 


13 


137 


143 


0.19 



NITRO- 
GEN, 
NITRITE 
TOTAL 
(MG/L 
AS N) 



0.010 



134 





91 





87 





142 





135 





131 





NITRO- 
GEN, 
NITRITE 
DIS- 
SOLVED 
(MG/L 
AS N) 


NITRO- 
GEN, 
N02+N03 
TOTAL 
(MG/L 
AS N) 


0.020 


<0.050 


0.020 


— 


0.010 


~ 


<0.010 


— 


<0.010 


— 


<0.010 


-- 



110 
75 
71 
116 
111 
107 



260 



RUSSIAN RIVER BASIN 
11467000 RUSSIAN RIVER NEAR GUERNEVILLE. CA--Contlnued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 





NITRO- 




NITRO- 


NITRO- 








PHOS- 








GEN, 


NITRO- 


GEN. 


GEN, AM- 




PHOS- 


PHOS- 


PHORUS 


ALUM- 






N02+N03 


GEN, 


A^t10NIA 


MONIA + 


PHOS- 


PHORUS 


PHORUS 


ORTHO, 


INUM, 


BARIUM, 




DIS- 


AhMONIA 


DIS- 


ORGANIC 


PHORUS 


DIS- 


ORTHO 


DIS- 


DIS- 


DIS- 




SOLVED 


TOTAL 


SOLVED 


TOTAL 


TOTAL 


SOLVED 


TOTAL 


SOLVED 


SOLVED 


SOLVED 


DATE (MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(MG/L 


(UG/L 


(UG/L 




AS N) 


AS N) 


AS N) 


AS N) 


AS P) 


AS P) 


AS P) 


AS P) 


AS AL) 


AS BA) 


NOV 






















17.. 


<0.050 


0.020 


<0.010 


<0.20 


0.030 


0.040 


0.020 


0.020 


<10 


68 


JAN 






















26.. 


0.490 


-- 


0.040 


0.40 


0.220 


0.060 


-- 


0.060 


80 


45 


MAR 






















17.. 


0.520 


-- 


0.090 


0.70 


0.220 


0.090 


-- 


0.080 


— 


-- 


MAY 






















24.. 


0.250 


— 


0.030 


<0.20 


0.060 


0.040 


— 


0.050 


20 


75 


JUL 






















12.. 


0.110 


— 


0.040 


<0.20 


0.020 


0.020 


— 


0.020 


-- 


— 


SEP 






















21.. 


0.062 




0.020 


<0.20 
MANGA- 


0.020 
MOLYB- 


0.010 


SELE- 


0.010 


<10 
STRON- 


69 
VANA- 




COBALT. 


IRON. 


LITHIUM 


NESE, 


DENUM, 


NICKEL, 


NIUM, 


SILVER. 


TIUM, 


DIUM, 




DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 


DIS- 




SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


SOLVED 


DAT 


rE (UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 


(UG/L 




AS CO) 


AS FE) 


AS LI) 


AS MN) 


AS MO) 


AS NI) 


AS SE) 


AS AG) 


AS SR) 


AS V) 


NOV 






















17.. 


<3 


13 


5 


10 


<10 


1 


<1 


<1.0 


220 


<6 


JAN 






















26.. 


<3 


47 


<4 


8 


<10 


3 


<1 


<1.0 


150 


<6 


MAR 

17.. 
MAY 










































24.. 


<3 


7 


4 


10 


<ia 


2 


<1 


<1.0 


2S0 


<6 


JUL 

12.. 
SEP 










































21.. 


<3 


5 


<4 


5 


<10 


2 


<1 


<1.0 


200 


<6 



CROSS-SECTIONAL DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



FEB 
24. 
24. 
24. 
24. 
24. 





DEPTH 


SAMPLE 




PH 




BARO- 




OXYGEN, 




SED. 




AT 


LOC- 


SPE- 


WATER 




METRIC 




DIS- 




SUSP. 




SAMPLE 


ATION, 


CIFIC 


WHOLE 




PRES- 




SOLVED 


SEDI- 


SIEVE 




LOC- 


CROSS 


CON- 


FIELD 


TEMPER- 


SURE 


OXYGEN , 


(PER- 


MENT. 


DIAM. 




ATION, 


SECTION 


DUCT- 


(STAND- 


ATURE 


(m 


DIS- 


CENT 


SUS- 


I FINER 


TIME 


TOTAL 


(FT FM 


ANCE 


ARD 


WATER 


OF 


SOLVED 


SATUR- 


PENDED 


THAN 




(FEET) 


L BANK) 


(US/CM) 


UNITS) 


(DEG C) 


HG) 


(MG/L) 


ATION) 


(MG/L) 


.062 m 


1640 


30.4 


163 


158 


7.5 


9.5 


763 


10.6 


93 


194 


92 


1650 


45.9 


147 


152 


7.7 


9.5 


763 


10.5 


92 


190 


95 


1700 


41.8 


133 


153 


7.7 


9.5 


763 


10.6 


93 


184 


96 


1710 


36.5 


113 


153 


7.8 


9.5 


763 


10.5 


92 


195 


93 


1720 


28.7 


78.0 


152 


7.8 


9.5 


763 


10.4 


91 


196 


91 



* Instantaneous streamflow at the time of cross-sectional measurement: 21,500 ft /s; 

PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 







DIS- 






SEDI- 


SED. 






CHARGE, 






MENT, 


SUSP. 






INST. 




SEDI- 


DIS- 


SIEVE 






CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 






FEET 


ATURE 


SUS- 


SUS- 


Z FINER 


DATE TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 






SECOND 


(DEG C) 


(MG/L) 


(T/DAY) 


.062 m 


NOV 














17.. 


1215 


274 


13.5 


4 


3.0 


86 


JAN 














26.. 


1215 


11900 


9.5 


182 


5850 


94 


FEB 














24.. 


1655 


21500 


9.5 


192 


11100 


94 


MAR 














17.. 


1100 


4190 


13.5 


196 


2220 


91 


MAY 














24.. 


1330 


585 


19.5 


8 


13 


89 


JUL 














12.. 


1115 


339 


21.0 


12 


11 


96 


SEP 














21.. 


1115 


223 


18.5 


11 


6.6 


94 



GUALALA RIVER BASIN 
11«67500 SOUTH FORK GUALALA RIVER NEAR ANNAPOLIS, CA 



261 



LOCATION. --Lat 38'42'18", long 123'25'19", in German Grant, Sonoma County, Bydrologic Unit 18010109, on left bank 
O.S mi downstream from Wheatfield Fork of Gualala River, and 3.0 mi west of toinapolls. 



DRAINAGE AREA.--161 mi^. 

PERIOD OF RECORD. — October 1950 to September 1971, June 1991 to current year (since 
1,000 ft^/s only). 



June 1991, flows below 



GAGE. --Water-stage recorder. Elevation of gage is 70 ft above sea level, from topographic map. Prior to 

Aug. 30, 1962, at site 2,100 ft upstream at different datum. Aug. 31, 1962, to September 1971, at site 420 ft 
upstream at different datum. 



REMARKS. --Records good. No regulation or diversion upstream 
computed above 1,000 ft /s. 



from station. Beginning June 1991, no records 



EXTREMES FOR PERIOD OF RECORD ( 1951-71) . --Maximum discharge, 55,000 ff'/s, Dec. 22, 1955, gage height, 2*. 57 ft. 



site and datum then in use, from rating ex 
flow; minimum, 0.4 ft^/s, Sept. 13, 1951. 



tended above 13,000 ft /s on basis of slope-area measurement of peak 



DISCHARGE, 



DAY 



OCT 



NOV 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DEC 



1 


1.8 


65 


9 


2 


2.5 


57 


19 


3 


4.5 


34 


255 


4 


5.6 


24 


102 


5 


5.3 


18 


52 


6 


4.5 


15 


-. 


7 


4.1 


13 


659 


B 


4.0 


12 


-• 


9 


3.1 


10 


-■ 


10 


3.1 


11 


-■ 


11 


2.7 


11 


-. 


12 


2.6 


8.9 


920 


13 


3.0 


8.6 


509 


14 


3.2 


8.0 


315 


IS 


3.3 


8.0 


195 


16 


2.3 


8.0 


128 


17 


2.3 


8.0 


167 


18 


2.3 


8.0 


146 


19 


2.5 


8.4 


96 


20 


4.8 


8.9 


80 


21 


12 


9.7 


73 


22 


13 


19 


58 


23 


14 


24 


47 


24 


9.8 


18 


40 


2S 


7.8 


14 


35 


26 


6.7 


12 


30 


27 


6.1 


11 


27 


28 


5.4 


11 


214 


29 


73 


10 


638 


30 


103 


9.7 


599 


31 


53 





- 


TOTAL 


371.3 


483.2 


- 


MEAN 


12.0 


16.1 


- 


MAX 


103 


65 


- 


MIN 


1.8 


8.0 


- 


AC-FT 


736 


958 


- 


e Estimated. 







JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 






290 


e586 


eS86 


el67 


487 


80 


18 




e7.9 





282 


e464 


e427 


el50 


386 


75 


16 




e7.8 


887 


267 


e470 


e376 


eie2 


322 


71 


14 




7.7 


591 


245 


e402 


e353 


el55 


388 


45 


13 




7.3 


471 


254 


e360 


e312 


el34 


554 


61 


12 




7.0 


559 


236 


e330 


e285 


el30 


441 


61 


14 




e7.0 





217 


e305 


e261 


124 


362 


60 


14 




e6.9 





401 


e283 


e268 


120 


306 


59 


20 




e6.8 


993 


379 


e257 


e324 


116 


254 


60 


32 




e6.7 


984 


360 


e234 


e257 


113 


204 


60 


30 




e6.S 


751 





e213 


e228 


110 


172 


59 


24 




e6.3 


615 


e833 


192 


e208 


108 


156 


56 


17 




e6.2 





e600 


183 


el92 


106 


136 


SO 


16 




e6.1 





e4gi 


181 


el79 


105 


125 


44 


IS 




•6.0 





417 


180 


el71 


101 


118 


40 


14 




•6.0 





e366 


175 


el57 


97 


116 


38 


al3 




•5.9 











elOOO 


93 


115 


37 


el2 




e5.8 











e724 


92 


110 


35 


ell 




e5.7 








985 


e460 


111 


108 


32 


ell 




e5.6 








e688 


e368 


149 


106 


30 


elO 




e5.5 








e543 


e312 


134 


104 


29 


elO 




e5.4 








e450 


e271 


110 


105 


27 


elO 




e5.3 








eS64 


e346 


102 


103 


25 


•9. 


8 


e5.3 








e834 


e540 


102 


100 


24 


•9. 


6 


e5.4 


905 





e570 


e341 


123 


97 


23 


•9. 


4 


eS.3 


687 


e866 


e479 


e289 


718 


93 


22 


e9. 


2 


•5.2 


556 


e731 


e433 


e255 


705 


92 


23 


e9. 


1 


•5.1 


439 


e624 


e437 


e228 


449 


89 


23 


e8. 


9 


•5.1 


357 





e358 


e202 


332 


86 


23 


e8. 


7 


• 5.0 


333 





e314 


el83 


322 


83 


22 


a8. 


5 


• S.O 


306 





e332 





536 





21 


e8. 


2 














10103 


6076 


5918 


1315 


427. 


4 


182.8 











337 


196 


197 


42.4 


13. 


8 


6.09 











1000 


718 


554 


80 


32 


7.9 











157 


92 


83 


21 


8. 


2 


5.0 











20040 


12050 


11740 


2610 


848 


363 



262 



GUALALA RIVER BASIN 



11467500 SOUTH FORX GUALALA RIVER NEAR ANNAPOLIS. CA-Contlnu.d 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1971. BY WATER YEAR (WY) 



MEAN 
MAX 

(WY) 

MIN 

(WY) 



OCT 

76.9 
736 
1956 
1.02 
1967 



NOV 

245 

679 

1964 

8.08 

1960 



DEC 

1026 
3060 
1956 
13.3 
1960 



SWUARY STATISTICS 

ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



JAN 

1471 
4152 
1970 
260 
1962 



FEB 

1158 
4407 
1958 
132 
1971 



MAR 

626 
1188 
1960 
83.2 
1955 



WATER YEARS 1951 - 1971 



431 








774 






1958 


190 






1964 


25500 


Dec 


22 


1955 


.49 


Oct 


2 


1970 


.51 


Sep 


30 


1970 


55000 


Dec 


22 


1955 


24.57 


Dec 


22 


1955 


311900 








1040 








57 








4.8 









APR 

410 
1401 
1963 
55.8 
1964 



MAY 

117 

660 

1957 

31.6 

1964 



JUN 

37.1 
103 
1957 
14.0 
1970 



JUL 

13.4 
23.9 
1957 
2.85 
1970 



AUG 

7.16 
24.5 
1954 
1.72 
1970 



SEP 

10.4 
90.0 
1957 
1.68 
1970 



GARCIA RIVER BASIN 
11467590 GARCIA RIVER AT EUREKA HILL ROAD, NEAR POINT ARENA, CA 



263 



LOCATION.— Lat 38'54'12", long 123*36'28", in NW 1/4 SW 1/4, sec. 14, T.12 N. , R.16 W. , Mandoclno County, 

Hydrologlc Unit 18010108, on upstream side of bridge, 1.9 ml upstream from North Fork Garcia River and 4.5 ml 
southeast of Point Arena. 

DRAINAGE AREA. --83. 2 mi^. 

PERIOD OF RECORD.— 

SEDIMENT DATA: October 1992 to September 1993. 



PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



DATE 



DEC 

03. . 

10.. 
JAN 

07.. 

28.. 
FEB 

11.. 
MAR 

11.. 
MAY 

06.. 





DIS- 






SEDI- 


SED. 


SED. 


SED. 




CHARGE, 






MENT, 


SUSP. 


SUSP. 


SUSP. 




INST. 




SEDI- 


DIS- 


FALL 


FALL 


FALL 




CUBIC 


TEMPER- 


MENT, 


CHARGE, 


DIAM. 


DIAM. 


DIAM. 




FEET 


ATURE 


SUS- 


SUS- 


X FINER 


Z FINER 


Z FINER 


TIME 


PER 


WATER 


PENDED 


PENDED 


THAN 


THAN 


THAN 




SECOND 


(DEG C) 


<MG/L) 


(T/DAY) 


.002 m 


.004 bM 


.008 m 


1040 


103 


9.5 


15 


4.2 





__ 





1510 


5040 


10.5 


2320 


31600 


32 


40 


52 


1405 


1180 


10.5 


121 


386 





— 


— 


1040 


408 


10.0 


30 


33 


— 


— 


-- 


140S 


571 


10.5 


73 


113 


— 


— 


— 


1115 


158 


12.5 


4 


1.7 


— 


— 


— 


1630 


107 


16.5 


2 


0.58 


— 


— 


— 



DATE 



DEC 

03.. 

10.. 
JAN 

07.. 

28.. 
FEB 

11. . 
MAR 

11. . 
MAY 

06.. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


SUSP. 


FALL 


FALL 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


Z FINER 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 



.016 tK .031 »1 .062 VK .125 VK .250 Ml .500 m 1.00 bM 



68 



81 



77 


89 


100 


-- 


89 


95 


99 


100 


70 


83 


94 


98 


66 


— 


-- 


-- 


74 


84 


98 


100 


76 


— 


— 


— 


100 





— 


— 



100 



264 GARCIA RIVER BASIN 

11*67590 GARCIA RIVER AT EUREKA HILL ROAD, NEAR POINT ARENA, CA 
PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 











SAMPLE 


DIS- 


BED 


BED 


BED 








NUMBER 


LOC- 


CHARGE, 


MAT. 


MAT. 


MAT. 








OF 


ATION, 


INST. 


SIEVE 


SIEVE 


SIEVE 






TEMPER- 


SAM- 


CROSS 


CUBIC 


DIAM. 


DIAM. 


DIAM. 






ATURE 


PLING 


SECTION 


FEET 


I FINER 


I FINER 


X FINER 


DATE TIME 


WATER 


POINTS 


(FT FM 


PER 


THAN 


THAN 


THAN 






(DEG C) 


(COUNT) 


L BANK) 


SECOND 


.062 m 


.125 m 


.250 ^t^ 


OCT 


















23.. 


13*5 


17.0 




45.0 


15 




26 


73 


23.. 


1350 


17.0 




70.0 


15 




5 


17 


23.. 


1355 


17.0 




90.0 


15 




2 


3 


23.. 


lAOO 


17.0 




110 


15 




2 




23.. 


1*05 


17.0 




130 


15 




2 




23.. 


1*10 


17.0 




150 


15 




2 




23.. 


1*15 


17.0 




170 


15 




7 


24 


23.. 


1*20 


17.0 




190 


15 




2 




23.. 


1*25 


17.0 




210 


15 




2 


6 


23.. 


1*30 


17.0 




230 


15 




22 


77 




BED 


BED 


BED 


BED 


BED 


BED 


BED 


BED 




MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 


MAT. 




SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 




DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 




I FINER 


I FINER 


Z FINER 


I FINER 


Z FINER 


I FINER 


I FINER 


I FINER 


DAI 


rE THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 


THAN 




.500 1*1 


1.00 m 


2.00 hW 


*.00 ^W 


8.00 M^ 


16.0 1*1 


32.0 (*! 


5*.0 (*1 


OCT 


















23.. 


92 


96 


98 


100 


-- 


-- 


-- 


._ 


23.. 


33 


** 


5* 


73 


9* 


100 


-- 


_- 


23.. 


* 


6 


10 


23 


36 


65 


100 





23.. 


20 


27 


3* 


*6 


60 


8* 


100 


-- 


23.. 


8 


13 


19 


25 


33 


45 


7* 


100 


23.. 


11 


16 


19 


27 


40 


67 


89 


100 


23.. 


*3 


*8 


52 


56 


60 


67 


89 


100 


23.. 


12 


17 


22 


30 


*2 


65 


79 


100 


23.. 


1* 


2* 


33 


43 


55 


73 


87 


100 


23.. 


99 


100 


-- 


— 


— 


-- 


-- 


-- 



GARCIA RIVER BASIN 
11467590 GARCIA RIVER AT EUREKA HILL ROAD, NEAR POINT ARENA, CA 
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 



265 



DATE 



DEC 

10. .. 
JAN 

07...' 
FEB 

11.. . 



SAM- 
PLING 
TIME METHOD , 
CODES 



1615 1000 
1510 1000 
1450 1000 



BAG 

MESH 

SIZE 

SAMPLER BEDLOAD SAMPLNG TIME 
TYPE SAMPLER (YES=1) (2400 
(CODE) (hM) (CODE) HOURS) 



TETHER 

LINE START - 
USED IN ING 



1100 
1100 
1100 



0.250 
0.250 
0.250 



1545 
1435 
1440 



END- 
ING 
TIME 
(2400 
HOURS 



1645 
1550 
1500 



TIME 
ON BED 

FOR 

BED 

LOAD 
SAMPLE 

(SEC) 



30 
30 
30 



HORI- 
ZONTAL 

WIDTH 
OF 

VER- 
TICAL 
(FEET) 



10.0 
2.8 
2.6 



COMPSTD 

SAMPLES 

IN 

X-SEC 
BEDLOAD 
MEASMNT 

(NUM) 



VER- 
TICALS 
IN 

COM- 
POSITE 
DATE SAMPLE 



DEC 

10. .. 
JAN 

07... 
FEB 

11... 



15 
40 
12 



SAMPLE 
NUMBER LCX;- 
OF ATION, 
SAM- C310SS 
PLING SECTION 
POINTS (FT FM 



DIS- 
CHARGE, 
INST. 
CUBIC 
FEET 
PER 



BEDLOAD BEDLOAD 
SIEVE SIEVE 



DISCH, SEDI- SED. SED. 

BEDLOAD 

AV UNIT 

TEMPER- FOR COM CHARGE, 

ATURE POSITE BEDLOAD 

WATER SAMPLE (TONS/ THAN THAN 



SEDI- 
MENT 
DIS- 



DIAM. 



DIAM. 



I FINER Z FINER 



(NUM) (COUNT) L BANK) SECOND (DEG C) T/D/FT DAY) .062 m . 125 hW 



15 


85.0 


5040 


40 


66.0 


1180 


12 


78.0 


571 



10.5 


10.6 


1590 


10.5 


0.02 


2.2 


10.5 


0.07 


2.2 



DATE 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



SED. 



BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD 



SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


SIEVE 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 


DIAM. 



X FINER X FINER Z FINER Z FINER Z FINER Z FINER Z FINER Z FINER Z FINER 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



THAN 



.250 m .500 vn i.oo vn 2.00 ttt 4.00 ^M 8.00 m 16.0 vn 32.0 ^M 64. m 



DEC 




















10... 


2 


10 


20 


30 


39 


49 


65 


87 


100 


JAN 




















07... 


2 


8 


16 


25 


38 


58 


81 


90 


100 


FEB 




















11... 


26 


67 


81 


87 


95 


100 


— 


— 


- 



*BedIoad samples taken on Jan. 7, 1993, were from a two-channel cross section. Each 
channel was sampled and analyzed separately. However, the data were combined for 
publication. 



266 



HAVARRO RIVER BASIN 
ll^eSOOO NAVARRO RIVER NEAR NAVARRO, CA 



LOCATION. --Lat 39'10'20", long 123'40'06", in SE 1/4 8«c.7, T.15 N. , R.16 W. , Mandoclno County, Hydrologie Unit 
18010108, on right bank 2.9 mi downstream from North Fork, S.2 mi upstream from mouth, and 6.8 mi west of 
Navarro. 

DRAINAGE AREA.— 303 mi^. 

PERIOD OF RECORD. — October 1950 to current year. 

REVISED RECORDS. --WSP 1**5: 195*(M). WSP 1929: Drainage area. 

GAGE. "Water-stage recorder and crest-stage gage. Datum of gage is *.79 ft above sea level. Prior to 
Oct. 1, 1969, at site 0.2 mi upstream at datum 1.86 ft higher. 

RIMARKS. --Records poor. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 64,500 ft^/s, Dec. 22, 1955, gage height, 40.60 ft, sits and 
datura then in use, from rating curve extended above 19,000 ft /s on basis of slope-area measurement of peak 
flow; minimum daily, 0.23 ft^/s, July 13, 1977. 

EXTREMES OUTSIDE PERIOD OF RECORD. — Flood of December 1937 reached a stage of 38.2 ft, from floodmarks. 



EXTREMES FOR CURRENT YEAR. — Peak discharges greater than base discharge of 7,000 ft'/s and maximum (*): 

Discharge Gage height Discharge Gage height 

Date Time (ft^/s) (ft) Date Time (ft^/s) (ft) 



Dec. 


10 


1915 


10,800 


17.91 


Jan. 


1 


0115 


28,000 


27.91 



Jan. 21 



Unknown 



*48,200 



Minimum daily, 3.1 ft'/s. Oct. 1. 



•35.42 



DAY 



OCT 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


3.1 


91 


18 


15500 


459 


6650 


686 


238 


399 


65 


21 


14 


2 


3.9 


91 


23 


3930 


417 


e570 


588 


214 


337 


59 


21 


1* 


3 


7.7 


70 


99 


1800 


385 


e510 


538 


215 


283 


60 


22 


1* 


4 


7.8 


50 


161 


1130 


356 


6*80 


522 


224 


266 


62 


21 


1* 


5 


11 


37 


79 


900 


63*0 


6*10 


490 


196 


409 


59 


21 


1* 


6 


9.8 


29 


71 


910 


6320 


6400 


457 


195 


425 


56 


21 


14 


7 


7.4 


24 


1020 


82730 


6310 


6375 


425 


185 


389 


50 


22 


13 


e 


6.4 


21 


973 


62920 


6340 


6342 


398 


175 


354 


49 


23 


14 


8 


5.7 


19 


5470 


62710 


6375 


6322 


442 


166 


307 


48 


22 


14 


10 


5.5 


17 


5920 


62*00 


6500 


e310 


391 


159 


272 


46 


22 


13 


11 


5.3 


16 


3760 


62320 


6690 


300 


352 


154 


237 


43 


621 


13 


12 


5.2 


15 


1890 


61780 


e630 


279 


328 


151 


211 


41 


622 


13 


13 


4.9 


14 


965 


61620 


6595 


261 


311 


151 


197 


42 


22 


13 


14 


5.0 


14 


619 


63350 


6535 


281 


296 


149 


176 


40 


22 


13 


IS 


4.8 


14 


460 


65360 


e460 


262 


281 


142 


160 


38 


23 


13 


16 


4.8 


14 


363 


63950 


6425 


242 


262 


136 


151 


41 


23 


13 


17 


5.0 


14 


312 


63*00 


6440 


702 


552 


130 


144 


36 


22 


13 


IB 


5.1 


14 


292 


62600 


6725 


1120 


857 


125 


136 


33 


22 


14 


19 


5.4 


16 


237 


62030 


61530 


850 


591 


125 


125 


33 


22 


13 


20 


7.5 


16 


213 


616900 


63130 


688 


516 


136 


117 


32 


23 


14 


21 


15 


18 


200 


629700 


e2800 


593 


461 


143 


111 


30 


22 


13 


22 


30 


26 


178 


615300 


63000 


524 


419 


130 


107 


28 


21 


13 


23 


20 


31 


161 


68350 


63150 


633 


392 


122 


101 


29 


20 


13 


2« 


IS 


29 


149 


e*800 


62600 


1600 


505 


118 


99 


28 


19 


13 


25 


12 


25 


138 


62500 


61830 


1090 


422 


118 


91 


26 


19 


12 


26 


11 


22 


129 


61200 


61330 


906 


383 


148 


81 


26 


17 


ell 


27 


10 


21 


121 


963 


6965 


776 


344 


282 


79 


25 


17 


elO 


26 


10 


20 


290 


798 


6790 


730 


319 


403 


77 


25 


16 


e9.8 


29 


21 


20 


1660 


688 





614 


292 


274 


74 


24 


15 


•9.6 


30 


86 


18 


1670 


594 





540 


268 


232 


70 


23 


15 


•9.3 


31 


100 





9870 


516 





502 





339 





22 


14 





TOTAL 


451.3 


826 


37511 


143649 


29427 


17862 


13088 


5675 


5985 


1219 


633 


383.7 


MEAN 


14.6 


27.5 


1210 


463* 


1051 


576 


436 


183 


199 


39.3 


20.4 


12.8 


MAX 


100 


91 


9870 


29700 


3150 


1600 


857 


403 


425 


65 


23 


14 


MIN 


3.1 


14 


18 


516 


310 


242 


262 


118 


70 


22 


14 


9.3 


AC-FT 


895 


1640 


74400 


284900 


58370 


35*30 


25960 


11260 


11870 


2420 


1260 


761 


• Estimated. 

























NAVARRO RIVER BASIN 



267 



11468000 NAVARRO RIVER NEAR NAVARRO, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 43.6 291 


991 


1597 


1414 


1028 


501 


129 


50.1 


20.1 


11.1 




10.5 


MAX 367 2033 


4396 


5464 


5522 


4280 


2517 


499 


199 


46.7 


26.8 




32.6 


(WY) 1958 1974 


1965 


1970 


1958 


1983 


1982 


1983 


1993 


1983 


1983 




1957 


MIN 3.10 9.06 


18.5 


24.0 


58.6 


69.8 


34.2 


14.1 


4.23 


.62 


.67 




1.33 


(WY) 1989 1991 


1977 


1991 


1977 


1988 


1977 


1977 


1977 


1977 


1977 




1991 


SU^t1ARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 WATER YEAR 




WATER YEARS 1951 


. - 


1993 


ANNUAL TOTAL 




140007.1 






256710.0 














ANNUAL MEAN 




383 






703 






504 








HIGHEST ANNUAL MEAN 
















1310 






1983 


LOWEST ANNUAL MEAN 
















25.0 






1977 


HIGHEST DAILY MEAN 




9870 


Dec 31 




29700 


Jan 21 




45100 


Jan 


16 


1974 


LOWEST DAILY MEAN 




2.3 


Aug 23 




3.1 


Oct 1 




.23 


Jul 


13 


1977 


ANNUAL SEVEN-DAY MINIMUM 




2.3 


Aug 23 




5.0 


Oct 12 




.28 


Jul 


8 


1977 


INSTANTANEOUS PEAK FLOW 










48200 


Jan 21 




64500 


Dec 


22 


1955 


INSTANTANEOUS PEAK STAGE 










35.42 


Jan 21 




40.60 


Dec 


22 


1955 


ANNUAL RUNOFF (AC-FT) 




277700 






509200 






364900 








10 PERCENT EXCEEDS 




766 






1560 






1200 








50 PERCENT EXCEEDS 




35 






138 






59 








90 PERCENT EXCEEDS 




2.8 






13 






7.7 









268 



NOVO RIVER BASIN 
11468500 NOYO RIVER NEAR FORT BRAGG, CA 



LOCATION.— Lat 39*25'42", long 123*'i'i ' 12" . in NE 1/4 sec. 15. T.18 N., R.17 W. . Mendocino County, Hydrologlc Unit 
18010108, on right bank 0.7 mi downstream from South Fork and 3.5 mi east of Fort Bragg. 

DRAINAGE AREA.--106 mi^. 

PERIOD OF RECORD. --August 1951 to current year. 

REVISED RECORDS. --WSP 1929: Drainage area. 

GAGE. --Mater-stage recorder. Datum of gage is 11.73 ft above sea level. 

REMARKS. --Records good. No regulation or diversion upstream from station. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 26,600 ft^/s, Mar. 29, 1974, gage height, 27.14 ft from 
rating curve extended above 4,500 ft /s on basis of slope-conveyance study; minimum dally, 0.79 ft /a, 
Sept. 8, 1977. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 2,400 ft^/s and maximum (*): 

Discharge Gage height 
Date Time (ft^/s) (ft) Date Time 



Discharge Gage height 
(ft^/s) (ft) 



Dec. 


10 


1730 


3,960 


12.31 


Dec. 


31 


2015 


11,900 


20.70 


Jan. 


14 


0730 


2,530 


10.27 



Jan. 20 
Mar. 18 



1630 
0445 



*23,100 
2,600 



•26.49 
10.28 



Minimum daily, 2.8 ff»/s, Oct. 12-14, 16. 17. 19. 



DISCHARGE, 



DAY 



OCT 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


7.1 


49 


8.1 


5470 


220 


347 


288 


143 


731 


44 


21 


el3 


2 


0.6 


55 


16 


1840 


192 


318 


260 


129 


555 


43 


20 


el2 


3 


14 


35 


26 


914 


175 


299 


243 


135 


402 


41 


19 


el2 


4 


16 


24 


23 


577 


159 


264 


274 


134 


346 


40 


18 


el2 


S 


6.4 


17 


19 


424 


149 


235 


280 


116 


368 


39 


18 


el2 


6 


4.9 


14 


32 


398 


138 


217 


269 


107 


309 


38 


18 


el2 


7 


4.0 


12 


104 


1030 


129 


200 


248 


100 


269 


37 


18 


ell 


8 


3.7 


10 


453 


1100 


131 


185 


234 


93 


227 


36 


18 


ell 


9 


3.3 


8.7 


1460 


853 


134 


173 


234 


88 


195 


35 


18 


ell 


10 


3.1 


7.9 


2250 


803 


137 


167 


212 


83 


169 


34 


18 


ell 


11 


3.1 


7.1 


1600 


688 


326 


152 


191 


80 


147 


33 


17 


ell 


12 


2.8 


6.7 


1090 


550 


329 


141 


176 


78 


124 


30 


17 


elO 


13 


2.8 


6.1 


560 


549 


294 


135 


160 


76 


116 


29 


17 


elO 


14 


2.8 


6.0 


330 


2100 


260 


132 


149 


72 


106 


29 


17 


elO 


15 


2.9 


6.0 


224 


1530 


229 


138 


140 


62 


97 


28 


16 


elO 


16 


2.8 


6.2 


165 


1290 


200 


141 


125 


64 


91 


28 


16 


elO 


17 


2.8 


7.5 


144 


993 


210 


1710 


278 


62 


85 


28 


16 


e9.9 


18 


2.9 


8.1 


128 


762 


289 


2370 


440 


61 


79 


27 


16 


e9.8 


19 


2.8 


9.6 


109 


633 


791 


1480 


402 


62 


73 


27 


16 


e9.8 


20 


4.8 


12 


108 


13600 


1810 


925 


347 


68 


68 


26 


16 


e9.7 


21 


15 


11 


104 


5780 


1370 


649 


296 


64 


65 


25 


16 


o9.7 


22 


12 


25 


97 


3360 


1180 


487 


246 


60 


61 


26 


16 


e9.6 


23 


7.8 


32 


91 


2060 


1900 


548 


244 


57 


59 


25 


15 


e9.5 


24 


5.8 


23 


85 


1260 


1490 


763 


312 


57 


57 


25 


15 


e9.6 


2S 


4.9 


17 


79 


856 


998 


701 


269 


57 


55 


24 


14 


e9.4 


26 


5.0 


14 


74 


626 


715 


577 


240 


118 


52 


23 


14 


e9.5 


27 


4.4 


12 


69 


486 


536 


460 


217 


205 


50 


23 


el4 


e9.6 


28 


4.3 


11 


136 


386 


419 


374 


195 


177 


48 


23 


el4 


e9.5 


29 


19 


9.9 


624 


325 





305 


172 


141 


51 


23 


el3 


e9.5 


30 


48 


8.8 


984 


283 





256 


155 


173 


42 


23 


el3 


e9.4 


31 


35 





5680 


249 





237 





608 





22 


el3 





TOTAL 


263.8 


471.6 


16872.1 


51775 


14910 


15086 


7296 


3530 


5097 


934 


507 


312.5 


MEAN 


8.51 


15.7 


544 


1670 


532 


487 


243 


114 


170 


30.1 


16.4 


10.4 


MAX 


48 


55 


5680 


13600 


1900 


2370 


440 


608 


731 


44 


21 


13 


MIN 


2.8 


6.0 


8.1 


249 


129 


132 


125 


57 


42 


22 


13 


9.4 


AC-FT 


523 


935 


33470 


102700 


29570 


29920 


14470 


7000 


10110 


1850 


1010 


620 


e Estimated. 

























NOYO RIVER BASIN 



269 



11468500 NOYO RIVER NEAR FORT BRAGG. CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 1993, BY WATER YEAR (WY) 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



MEAN 


17.8 


126 


412 


624 


531 


439 


214 


74.2 


33.7 


13.7 


7.57 


6.39 


MAX 


166 


750 


2293 


1890 


2113 


1406 


877 


377 


170 


32.0 


17.7 


12.7 


(WY) 


1963 


1974 


1965 


1953 


1958 


1983 


1963 


1990 


1993 


1953 


1953 


1983 


MIN 


2.97 


5.29 


9.25 


16.6 


18.1 


32.4 


11.7 


9.50 


3.88 


1.90 


1.35 


2.16 


(WY) 


1979 


1960 


1977 


1977 


1977 


1988 


1977 


1977 


1977 


1977 


1977 


1970 



SUM1ARY STATISTICS 



FOR 1992 CALENDAR YEAR 



FOR 1993 WATER YEAR 



WATER YEARS 1952 - 1993 



ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



44971.9 
123 



5680 Dec 31 
2.8 Oct 12 
2.8 Oct 12 



89200 
203 
20 
4.6 



117055.0 






321 






13600 


Jan 


20 


2.8 


Oct 


12 


2.8 


Oct 


12 


23100 


Jan 


20 


25.49 


Jan 


20 


232200 






743 






72 






9.4 







207 






484 




1983 


10.9 




1977 


20500 


Dec 


22 1964 


.79 


Sep 


8 1977 


1.0 


Aug 


16 1977 


26600 


Mar 


29 1974 


27.14 


Mar 


29 1974 


150000 






517 






32 






5.1 







270 



MATTOLE RIVER BASIN 



11469000 MATTOLE RIVER NEAR PETROLIA, CA 

LOCATION. --Lat 40'18'*2". long 124' 15' '.8" , in SE 1/4 NW 1/4 sec. 11. T.2 S.. R.2 W. , Humboldt County, Hydrologlc 
Unit 18010107, on right bank 0.2 mi upstream from Clear Creek, l.S mi southeast of Fetrolia, and 1.7 mi 
upstream from North Fork. 

DRAINAGE AREA.--240 mi^. 

PERIOD OF RECORD. --October 1911 to December 1913, October 1950 to current year. Monthly discharge only for some 
periods, published in WSP 131S-B. 

REVISED RECORDS." WSP 1285: 1912-13. WSP 1929: Drainage area. 

GAGE. --Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft above sea level, from topographic 
map. November 1911 to December 1913, nonrecording gages at several sites upstream within 0.3 mi of present 
site at various datums . Dec. 11, 1950, to July 14, 1955, at site 0.3 mi upstream at datum 7.48 ft higher. 
July 15, 1955, to Oct. 26, 1967, at site 0.4 mi downstream at different datum. 

REMARKS. — Records good except for estimated daily discharges, which are fair. Records good. Diversions for 
irrigation of about 350 acres upstream from station. 



EXTREMES FOR PERIOD OF RECORD. 



Maximum discharge, 90,400 ff'/s, Dec. 22, 1955, gage height, 29.60 ft, alto and 

3/ 



datum then in use, from rating curve extended above 26,000 ft /s on basis of slope-area measurement of peak 
flow; minimum daily, 17 ft^/s, Sept. 5, 15, 1977. 

EXTREMES FOR CURRENT YEAR. --Peak discharges greater than base discharge of 15,000 ft^/s and maximum (*): 



Date 



Time 



Dec. 10 1200 
Dec. 31 unknown 



Discharge 
(ft^/s) 

15,900 
40.800 



Gage height 
(ft) 

13.25 
20.45 



Date 



Jan. 20 
Mar. 18 



Time 



1015 
unknown 



Discharge 
(ft^/s) 

*45,400 
17.300 



Gage height 
(ft) 

♦21.44 
13.89 



Minimum daily, 34 ff^/s, Oct. 10-19. 



DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


90 


1220 


172 


el0300 


1260 


922 


1930 


997 


4430 


318 


112 


58 


2 


82 


619 


388 


4870 


1170 


915 


1860 


908 


3520 


308 


109 


58 


3 


69 


367 


460 


3010 


1110 


1790 


1760 


1050 


2620 


295 


102 


58 


4 


56 


266 


333 


2140 


950 


1490 


4870 


1090 


2210 


282 


99 


56 


5 


50 


217 


278 


1670 


839 


1170 


3390 


901 


1880 


271 


98 


55 


6 


43 


185 


424 


1470 


783 


961 


2470 


835 


1570 


259 


98 


55 


7 


41 


166 


987 


3520 


728 


823 


1930 


776 


1380 


245 


98 


55 


8 


39 


149 


5380 


3730 


731 


713 


2190 


724 


1220 


233 


96 


54 


9 


38 


135 


7220 


2910 


791 


615 


2250 


676 


1090 


224 


96 


52 


10 


34 


126 


10600 


2610 


853 


605 


2230 


639 


990 


212 


92 


52 


11 


34 


118 


6180 


2080 


1770 


e650 


2010 


602 


901 


203 


89 


52 


12 


34 


112 


3630 


1690 


1610 


e600 


1700 


586 


849 


194 


89 


50 


13 


34 


107 


1980 


1630 


1410 


e550 


1460 


561 


783 


186 


87 


50 


14 


34 


106 


1240 


2670 


1250 


eSOO 


1270 


633 


720 


186 


83 


49 


15 


34 


102 


871 


2700 


1110 


e20no 


1110 


546 


683 


181 


81 


49 


16 


34 


100 


666 


3800 


1010 


65600 


1010 


511 


640 


176 


81 


49 


17 


34 


100 


650 


2910 


965 


elOSOO 


3210 


481 


605 


173 


78 


49 


18 


34 


100 


550 


2230 


1700 


el2000 


3430 


455 


573 


166 


75 


49 


19 


34 


141 


454 


3140 


6650 


eSOOO 


2410 


866 


544 


159 


72 


49 


20 


73 


167 


497 


31000 


6930 


3660 


2020 


1210 


517 


153 


80 


49 


21 


200 


148 


484 


15600 


4330 


2490 


1790 


885 


492 


146 


83 


47 


22 


134 


740 


429 


13600 


3660 


1810 


1520 


796 


469 


147 


80 


46 


23 


93 


452 


379 


7130 


4550 


4040 


2100 


696 


443 


150 


73 


46 


24 


72 


307 


340 


4620 


3310 


3290 


3020 


634 


425 


145 


69 


44 


2S 


62 


249 


306 


3390 


2360 


2330 


2260 


599 


405 


138 


66 


43 


26 


57 


211 


278 


2640 


1790 


1820 


1930 


652 


383 


136 


64 


43 


27 


52 


226 


342 


2200 


1380 


1450 


1620 


1050 


364 


133 


64 


41 


28 


51 


231 


4180 


1900 


1110 


1210 


1400 


1100 


353 


132 


61 


41 


29 


282 


204 


e4510 


1660 





1030 


1230 


1070 


341 


128 


59 


41 


30 


653 


185 


e4030 


1500 





884 


1100 


3200 


327 


123 


59 


40 


31 


525 


... 


e24200 


1370 





888 





4930 





119 


58 





TOTAL 


3102 


7556 


82438 


145690 


56110 


75906 


62480 


30659 


31727 


5921 


2551 


1480 


MEAN 


100 


252 


2659 


4700 


2004 


2449 


2083 


989 


1058 


191 


82.3 


49.3 


MAX 


653 


1220 


24200 


31000 


6930 


12000 


4870 


4930 


4430 


318 


112 


58 


MIN 


34 


100 


172 


1370 


728 


550 


1010 


455 


327 


119 


58 


40 


AC-FT 


6150 


14990 


163500 


269000 


111300 


150600 


123900 


60810 


62930 


11740 


5060 


2940 


e Estimated. 

























MATTOLE RIVER BASIN 



271 



11A69000 MATTOLE RIVER NEAR PETROLIA. CA- -Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1912 
OCT NOV DEC JAN FEB 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



253 
1900 
1951 
23.8 
1988 



1513 
7159 
1974 
41.8 
1960 



SUMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



2896 
83A0 
1956 
39.7 
1977 



3487 
8928 
1970 
135 
1977 



3018 

10710 

1958 

243 

1977 



FOR 1992 CALENDAR YEAR 



326995 
893 



24200 
24 
25 



648600 

2070 

237 

30 



Dec 31 
Sep 23 
Sep 17 



1993, BY WATER YEAR (WY) 

MAR APR MAY JUN 



2257 
7929 
1983 
187 
1988 



1210 
5225 
1963 
166 
1988 



549 
1842 
1960 

151 
1970 



FOR 1993 WATER YEAR 



S05620 
1385 



31000 

34 

34 

45400 

21.44 

1003000 

3390 

561 

52 



Jan 20 
Oct 10 
Oct 10 
Jan 20 
Jan 20 



215 

1058 
1993 
68.9 
1977 



JUL 

83.4 
191 
1993 
31.3 
1977 



AUG 

51.8 
164 
1983 
22.9 
1977 



SEP 

64.0 
237 
1977 
22.0 
1970 



WATER YEARS 1912 - 1993 



1293 






2642 




1983 


157 




1977 


55200 


Dec 


22 1964 


17 


Sep 


5 1977 


17 


Sep 


5 1977 


90400 


Dec 


22 1955 


29.60 


Dec 


22 1955 


936700 






3290 






274 






37 







272 



EEL RIVER BASIN 



479560 



I 



47B500 



^-W- 



Van Duzen 



River 



Bull Creek 



9477476 



476600 






1477475 



476500 






I 



i 



477000 



A 



Kekawaka Creek 
Powerplant 

-O-i 



^ 



€ 



A 



475800 



^ 



S-^-A- 



Elder Creek 



475560 



Outlet Creek 



472200 

^^M 



475000 



474750 



A^ 



477450 



Kekawaka Creek 474730 



North Fork Eel River 




473900 

h-A 



Middle Fork Eel River 



472150 



pi 



1471500 



Van Arsdale Reservior 

700 acre-feet 

Since 1 907 



471000 



-WV 



EEL 



470500 



^ 



470000 



Lake Pillsbury 
80,560 acre-feet 

Since 1921 



East Canal 



A 

Potter Valley 
J Powerplant 



West Canal 



471500 

A 



D 



RIVER 



471099 

L— A 



EXPLANATION 



Gaging station and abbreviated number 
(Complete number as given in the 
station description of report is 1 1471500) 

Powerplant 

Stream, open flume, or canal showing 
direction of flow 



■> To East Fork 
Russian River 



Figure 25. Diversions and storage in Eel River basin. 



EEL RIVER BASIN 



273 



11470000 LAKE PILLSBURY NEAR POTTER VALLEY, CA 

LCX:ATI0N.— Lat 39*24'30", long 122"57'30", on line between sees. 14 and 23, T.18 N., R.IO W. , Lake County, Hydrologic 
Unit 16010103, Mendocino National Forest, at Scott Dam near right bank of Eel River, 0.3 mi downstream from Rice 
Fork, and 10.2 mi northeast of town of Potter Valley. 

DRAINAGE AREA.— 289 mi''. 

PERIOD OF RECORD. — October 1922 to September 1928 (daily gage heights only), October 1928 to current year. 
Monthend contents only for some periods, published in WSP 1315-B. Prior to October 1953, published as "at 
Hullville." 



GAGE. --Water-stage recorder and nonrecording gage. Datum of gage is 81.7 
Prior to Jan. 26, 1950, nonrecording gage at same site and datum. 



ft below sea level (river-profile survey). 



REMARKS. --Reservoir is formed by concrete overflow-type dam; storage began in December 1921. Beginning Oct. 1, 1985, 
capacity based on 198A resurvey. Usable capacity, 80,556 acre-ft between gage heights 1,822.4 ft, sill of outlet 
gate, and 1,910.0 ft, top of spillway gates; dead storage, 87 acre-ft. Water is released down Eel River to Van 
Arsdale Reservoir, most of which is diverted through tunnel to Potter Valley Powerplant; part is then used for 
irrigation and remainder flows into East Fork Russian River. Records given represent total contents at 2400 hours. 

COOPERATION. --Records were provided by Pacific Gas & Electric Co., in connection with a Federal Energy Regulatory 
Commission project; not rounded to U.S. Geological Survey standards. 

EXTREMES FOR PERIOD OF RECORD. --Maximum contents, 95,600 acre-ft. May 13, 16, 1925, gage height, 1,910.8 ft; maximum 
gage height, 1,911.84 ft, Dec. 22, 1964, from floodmarks; minimum contents, 10 acre-ft, Dec. 9, 10, 1931, gage 
height, 1,822.5 ft. 



EXTREMES FOR CURRENT YEAR. — Maximum contents, 80,643 acre-ft, 
27,614 acre-ft, Dec. 5, gage height, 1,879.62 ft. 



May 2, 3, gage height, 1,910.00 ft; minimum. 



Capacity table (elevation, in feet, and contents in acre-feet) 
(Based on table provided by Pacific Gas & Electric Co., dated April 1984) 



1,822.4 


87 


1,835 


1,371 


1,855 


7,831 


1,875 


22,451 


1,895 


50.179 


1,824 


153 


1,840 


2,463 


1,860 


10,456 


1.880 


28,071 


1,900 


59.469 


1,827 


333 


1,845 


3,391 


1.865 


13,701 


1,885 


34,474 


1,905 


69,675 


1,830 


626 


1.850 


5,710 


1,870 


17,664 


1,890 


41,811 


1.910 


80,643 



RESERVOIR STORAGE (ACllE-FEET), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY OBSERVATION AT 2400 HOURS 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


41232 


34188 


28287 


63897 


60585 


60723 


60743 


80324 


80096 


77488 


69864 


61995 


2 


41015 


34161 


28167 


61835 


60585 


60703 


61178 


80643 


79371 


77222 


69611 


61695 


3 


40721 


34052 


27962 


60940 


60349 


60920 


61955 


80643 


79100 


76934 


69398 


61436 


4 


40444 


33890 


27710 


60526 


60329 


60723 


63062 


80164 


79100 


76492 


69100 


61118 


5 


40153 


33648 


27614 


60211 


60940 


60723 


64040 


80164 


79235 


76140 


68866 


60881 


6 


39894 


33420 


28492 


60782 


60940 


60920 


65020 


80369 


79258 


75855 


68591 


60545 


7 


39591 


33300 


29089 


62336 


60920 


60920 


65797 


80369 


79213 


75352 


68379 


60211 


8 


39305 


33060 


34858 


61595 


62155 


60920 


66893 


80164 


79326 


74870 


68085 


59761 


9 


39064 


32769 


41638 


61138 


61955 


60901 


67916 


79892 


79461 


74627 


67853 


59160 


10 


38736 


32638 


52503 


60703 


61436 


60920 


68802 


79914 


79778 


74473 


67644 


58535 


11 


38439 


32336 


56791 


60349 


62175 


60723 


69675 


79937 


80028 


74297 


67372 


57917 


12 


38158 


32154 


58341 


60290 


61516 


60723 


70287 


79937 


80142 


74165 


67101 


57343 


13 


37894 


31920 


59352 


61536 


61118 


60920 


70689 


79937 


80324 


74056 


66789 


56734 


14 


37603 


31649 


59800 


66706 


60960 


61099 


71136 


79710 


80369 


73771 


66561 


56130 


15 


37284 


31419 


59937 


63002 


60762 


61079 


71800 


78965 


80369 


73662 


66312 


55456 


16 


37010 


31201 


59878 


62598 


60545 


61357 


72165 


78717 


80301 


73400 


65982 


54862 


17 


36738 


30958 


59683 


61955 


61337 


61416 


75505 


78717 


80278 


73182 


65715 


54230 


18 


36453 


30702 


59410 


61357 


63489 


63979 


77177 


78740 


80096 


72987 


65613 


53619 


19 


36156 


30562 


59176 


61755 


66685 


63387 


77422 


78740 


80073 


72922 


65592 


52940 


20 


36071 


30309 


59020 


72640 


64204 


62457 


77444 


79213 


79914 


72618 


65367 


52340 


21 


35579 


30258 


58767 


69015 


62981 


61476 


77155 


78987 


79846 


72467 


65122 


51780 


22 


35287 


30057 


58535 


65592 


62779 


61257 


76978 


78942 


79688 


72144 


64775 


51171 


23 


35051 


29944 


58168 


63774 


63164 


62316 


77177 


78965 


79665 


71928 


64532 


50514 


24 


34789 


29694 


57975 


62598 


62336 


62416 


76956 


79010 


79439 


71735 


64224 


49948 


25 


34515 


29595 


57534 


61915 


61935 


61795 


77444 


79258 


79123 


71542 


63979 


49418 


26 


34229 


29322 


57152 


61695 


61357 


61416 


77889 


79733 


78920 


71328 


63672 


48804 


27 


33998 


29187 


56734 


61695 


61099 


61099 


78336 


80164 


78672 


71136 


63387 


48179 


28 


33742 


28942 


57725 


61456 


60920 


60901 


78830 


79937 


78381 


70987 


63123 


47593 


29 


33755 


28747 


58962 


61079 





60743 


79393 


79756 


78157 


70689 


62880 


47047 


30 


34079 


28565 


59508 


60901 





60565 


80142 


80051 


77800 


70414 


62577 


46505 


31 


34107 




68548 


60762 





60683 





80643 


"" 


70139 


62276 




MAX 


41232 


34188 


68548 


72640 


66685 


63979 


80142 


80643 


80369 


77488 


69864 


61995 


MIN 


33742 


28565 


27614 


60211 


60329 


60565 


60743 


78717 


77800 


70139 


62276 


46505 


a 


1884.73 


1880.41 


1904.47 


1900.66 


1900.74 


1900.62 


1909.78 


1910.00 


1908.74 


1905.22 


1901.42 


1892.88 


b 


-7375 


-5542 


+39983 


-7786 


+ 158 


-237 


+19459 


+ 501 


-2843 


-7661 


-7863 


-15771 



CAL YR 1992 MAX 80552 MIN 21678 b +46563 
WTR YR 1993 MAX 80643 MIN 27614 b +5023 

a Elevation in feet, at end of month. 

b Change in contents, in acre-feet. 



274 



EEL RIVER BASIN 
11470500 EEL RIVER BELOW SCOTT DAM, NEAR POTTER VALLEY. CA 



LOCATION.— Lat 39'24'29", long 122*58*29", in SE 1/4 sec. 15. T.18 N., R.IO W. , Lake County, Bydrologlc Unit 
18010103, Mendocino National Forest, on left bank 0.4 mi upstream from Soda Creek, 0.7 ml downstream from 
Scott Dam, and 9.7 ml northeast of town of Potter Valley. 

DRAINAGE AREA.--290 mi^. 

PERIOD OF RECORD. — October 1922 to current year. Monthly discharge only for some periods, published in 
WSP 1315-B. Prior to October 1929, published as "South Eel River at Hullville," and October 1929 to 
September 1953, "at Hullville." 

REVISED RECORDS. --WSP 1315-B: 1923(M), 1938(M). WSP 1395: Drainage area. 

GAGE. --Water-stage recorder. Elevation of gage is 1,740 ft above sea level, from topographic map. Prior to 
Dec. 15, 1930, at datum 3.00 ft higher. 

REMARKS. — No estimated daily discharges. Flow regulated by Lake Pillsbury (station 11470000) 0.7 ml upstream. 
No diversion upstream from station. 

COOPERATION. --Records collected by Pacific Gas & Electric Co., under general supervision of the U.S. Geological 
Survey, in connection with a Federal Energy Regulatory Conmission project. 

EXTREMES FOR PERIOD OF RECORD . --Maximum discharge, 56,300 ft^/s, Dec. 22, 1964, gage height, 24.24 ft, from 
floodmarks, from rating curve extended above 37,000 ft /s; minimum daily, 0.1 ft /s, Sept. 8, 1924. 

EXTREMES FOR CURRENT YEAR .- -Maximum discharge, 28,100 ft^/s, Jan. 20, gage height, 17.48 ft; minimum daily, 
45 ft'/s, Aug. 19. 



DISCHARGE, 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 
DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


138 


145 


137 


8090 


1000 


1150 


1020 


491 


1460 


267 


147 


144 


2 


139 


145 


137 


2980 


926 


1100 


716 


552 


1210 


264 


146 


144 


3 


137 


143 


137 


1540 


874 


1190 


454 


996 


877 


269 


149 


148 


4 


13S 


142 


136 


1060 


831 


1210 


425 


729 


788 


275 


147 


150 


5 


136 


142 


132 


849 


963 


1160 


347 


553 


801 


271 


146 


148 


6 


136 


142 


137 


779 


1220 


1190 


286 


498 


777 


272 


147 


147 


7 


136 


142 


139 


2240 


1190 


1270 


298 


502 


676 


300 


139 


149 


8 


156 


141 


158 


2180 


1840 


1310 


308 


506 


474 


323 


141 


243 


9 


134 


139 


169 


1530 


2260 


1320 


316 


507 


413 


211 


144 


299 


10 


138 


139 


335 


1210 


1860 


1310 


319 


504 


300 


145 


136 


323 


11 


146 


139 


289 


956 


2550 


1260 


328 


500 


237 


137 


134 


323 


12 


150 


141 


228 


816 


2030 


1220 


316 


494 


298 


134 


138 


323 


13 


151 


143 


227 


1070 


1570 


1240 


315 


492 


269 


135 


143 


322 


14 


147 


142 


266 


3750 


1330 


1300 


319 


492 


251 


139 


142 


322 


15 


145 


141 


383 


3450 


1160 


1330 


318 


487 


259 


134 


141 


321 


16 


148 


141 


457 


3090 


1020 


1300 


319 


428 


272 


139 


139 


322 


17 


148 


141 


529 


2430 


1070 


3330 


351 


375 


271 


139 


140 


324 


18 


147 


141 


457 


1820 


2300 


4040 


880 


373 


264 


136 


78 


323 


19 


148 


141 


428 


1470 


5960 


3040 


992 


355 


266 


132 


45 


322 


20 


148 


140 


433 


16000 


6070 


2280 


996 


331 


270 


133 


99 


322 


21 


147 


140 


420 


12300 


3660 


1800 


994 


332 


271 


136 


142 


320 


22 


146 


141 


422 


9420 


2800 


1540 


986 


332 


270 


139 


142 


318 


23 


146 


138 


428 


4850 


3220 


1650 


899 


336 


271 


139 


142 


318 


24 


143 


138 


430 


3140 


2870 


2730 


822 


344 


271 


139 


141 


290 


25 


144 


139 


431 


2340 


2150 


2210 


679 


343 


275 


137 


141 


293 


26 


144 


139 


430 


1900 


1670 


1710 


459 


426 


276 


132 


141 


314 


27 


143 


139 


431 


1650 


1410 


1450 


289 


691 


276 


133 


142 


309 


28 


143 


138 


439 


1480 


1250 


1280 


260 


610 


270 


141 


143 


307 


29 


146 


137 


444 


1330 





1130 


262 


607 


261 


146 


143 


312 


30 


146 


137 


444 


1200 





1040 


374 


560 


265 


149 


144 


314 


31 


145 





4090 


1100 





978 





1370 





147 


144 





TOTAL 


4456 


4216 


13723 


98020 


57054 


50068 


15647 


16116 


13139 


5493 


4206 


8214 


MEAN 


144 


141 


443 


3162 


2038 


1615 


522 


520 


438 


177 


136 


274 


MAX 


156 


145 


4090 


16000 


6070 


4040 


1020 


1370 


1460 


323 


149 


324 


MIN 


134 


137 


132 


779 


831 


978 


260 


331 


237 


132 


45 


144 


AC-FT 


8840 


8360 


27220 


194400 


113200 


99310 


31040 


31970 


26060 


10900 


8340 


16290 



EEL RIVER BASIN 



275 



11470500 EEL RIVER BELOW SCOTT DAM, NEAR POTTER VALLEY, CA--Continued 
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1923 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN JUL 



MEAN 

MAX 

(WY) 

MIN 

(WY) 



222 

361 

1963 

19.1 

1978 



283 
1851 
1974 
13.3 
1934 



SUMIARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



745 
4945 
1965 
27.6 
1960 



1212 
5584 
1970 
35.8 
1944 



1394 
6624 
1986 
7.27 
1977 



FOR 1992 CALENDAR YEAR 



104757 
286 



4930 
47 
90 



207800 
439 
145 
109 



Feb 20 
Sep 1 
Aug 31 



1020 
4536 
1983 
11.8 
1977 



666 
3357 
1982 
15.4 
1977 



318 
1184 
1983 
34.4 
1977 



FOR 1993 WATER YEAR 



290352 






795 






16000 


Jan 


20 


45 


Aug 


19 


112 


Aug 


14 


28100 


Jan 


20 


17.48 


Jan 


20 


575900 






1810 






318 






139 







196 

438 

1993 

50.3 

1977 



181 

329 

1959 

64.5 

1977 



AUG 

182 

334 

1959 

65.0 

1977 



SEP 

212 

335 

1961 

34.4 

1977 



WATER YEARS 1923 - 1993 



548 






1443 




1983 


85.4 




1977 


45300 


Dec 


22 1964 


.10 


Sep 


8 1924 


.43 


Sep 


6 1924 


56300 


Dec 


22 1964 


24.24 


Dec 


22 1964 


397300 






1080 






233 






87 







276 



EEL RIVER BASIH 
11*71000 POTTER VALLEY POWERHOUSE INTAKE NEAR POTTER VALLEY, CA 



LOCATION . —Let 39*22'00", long 123"07'35', in SW l/* SW l/« sec. 31, T.18 N. , R.ll W. , Mendocino County, 

Hydrologic Unit 18010103, in penstock of powerhouse of Pacific Gas &. Electric Co., 1.5 mi southwest of Van 
Arsdale Dam, and 3.2 mi northwest of town of Potter Valley. 

PERIOD OF RECORD. --December 1909 to current year. Prior to October 1922, monthly discharge only, published In 
WSP 1315-B. Prior to October 1931, published as Snow Mountain Water and Power Co.'s Tallrace near Potter 
Valley. October 1931 to September 1984, published as Potter Valley Powerhouse Tallrace near Potter Valley. 

REVISED RECORDS.— WSP 1395: 1950. WDR CA-89-2: 1988. 

GAGE. --Acoustic flowmeter in penstock of powerplant. Elevation of gage is l.^AO ft above sea level, from 

topographic map. Prior to Dec. 11, 1985, water-stage recorder and Parshall flume. See WSP 1929 for history 
of changes prior to Apr. 12, 1950. 

REMARKS. --No estimated daily discharges. Water is diverted from Eel River above Van Arsdale Dam. After passing 
through powerhouse, part is used for irrigation in Potter Valley and remainder flows into East Fork Russian 
River . 

COOPERATION. — Records collected by Pacific Gas & Electric Co., under general supervision of the U.S. Geological 
Survey, in connection with a Federal Energy Regulatory Commission project. 

EXTREMES FOR PERIOD OF RECORD (1922 TO CURRENT YEAR) . --Maximum daily discharge, 351 ft^/s, Oct. 31, 1982; no 
flow at times in several years. 



DAY 



DISCHARGE , 



CUBIC FEET PER SECOND, WATER YEAR OCTOBER 
DAILY MEAN VALUES 



OCT 



HOV 



DEC 



JAM 



FEB 



MAR 



APR 



1992 TO SEPTEMBER 1993 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


146 


163 


138 


89 


309 


324 


323 


319 


318 


292 


154 


148 


2 


144 


166 


147 


239 


295 


323 


323 


318 


318 


293 


153 


148 


3 


144 


152 


146 


304 


303 


324 


308 


318 


41 


286 


154 


148 


4 


142 


147 


142 


304 


283 


323 


323 


316 


318 


292 


154 


145 


5 


139 


147 


141 


304 


309 


324 


322 


316 


318 


295 


151 


145 


6 


141 


145 


158 


289 


309 


324 


319 


319 


316 


292 


151 


147 


7 


140 


145 


167 


305 


308 


325 


318 


318 


318 


292 


151 


144 


8 


13S 


143 


126 


306 


308 


325 


324 


318 


318 


292 


153 


145 


9 


141 


140 


85 


308 


307 


325 


324 


318 


318 


318 


151 


242 


10 


139 


140 


131 


308 


307 


325 


324 


318 


316 


150 


151 


327 


11 


14S 


140 


161 


308 


306 


326 


325 


318 


316 


151 


150 


322 


12 


ISO 


141 


161 


308 


314 


326 


325 


318 


316 


160 


151 


319 


13 


148 


142 


161 


309 


322 


326 


325 


318 


316 


160 


150 


319 


14 


148 


143 


160 


128 


324 


326 


325 


318 


319 


156 


150 


319 


IS 


146 


142 


161 


183 


324 


326 


325 


318 


313 


159 


151 


319 


16 


147 


141 


218 


307 


324 


326 


325 


318 


315 


159 


150 


315 


17 


147 


142 


319 


307 


324 


326 


325 


318 


230 


154 


151 


321 


18 


147 


141 


322 


306 


324 


327 


325 


318 


312 


154 


129 


316 


19 


143 


145 


322 


306 


241 


325 


324 


319 


313 


154 


38 


319 


20 


1S2 


142 


320 


90 


26 


324 


325 


318 


312 


145 


48 


319 


21 


ISl 


141 


320 


189 


203 


324 


324 


318 


315 


145 


148 


306 


22 


145 


148 


323 


307 


325 


323 


321 


316 


312 


144 


148 


318 


23 


147 


148 


324 


306 


325 


324 


325 


319 


312 


147 


148 


319 


24 


145 


145 


281 


306 


325 


323 


316 


321 


312 


153 


150 


316 


25 


144 


142 


311 


305 


325 


323 


315 


319 


312 


154 


150 


321 


26 


146 


144 


313 


305 


324 


323 


315 


319 


310 


153 


150 


313 


27 


146 


143 


314 


304 


324 


323 


322 


319 


310 


153 


150 


312 


28 


145 


142 


313 


303 


324 


323 


319 


318 


310 


150 


150 


306 


29 


154 


140 


312 


304 





323 


316 


318 


292 


154 


150 


307 


30 


161 


137 


312 


309 





323 


319 


316 


287 


153 


150 


309 


31 


162 





174 


309 





323 





319 





153 


148 





TOTAL 


4530 


4337 


6983 


8555 


8342 


10055 


9551 


9851 


9033 


6013 


4433 


8054 


MEAN 


146 


145 


225 


276 


298 


324 


322 


318 


301 


194 


143 


268 


MAX 


162 


166 


324 


309 


325 


327 


325 


321 


319 


318 


154 


327 


MIN 


135 


137 


85 


89 


26 


323 


308 


316 


41 


144 


38 


144 


AC -FT 


8990 


8600 


13850 


16970 


16550 


19940 


19140 


19560 


17920 


11930 


8790 


15980 



EEL RIVER BASIN 



11*71000 POTTER VALLEY POWERHOUSE INTAKE NEAR POTTER VALLEY, CA--Contlnued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1910 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



277 



SEP 



MEAN 186 19* 


211 


227 


244 


245 


234 


216 


179 


160 


156 




180 


MAX 321 311 


311 


316 


325 


324 


326 


330 


325 


314 


320 




314 


(WY) 1991 1963 


1982 


1982 


1982 


1993 


1951 


1982 


1982 


1953 


1953 




1967 


MIN .000 9.70 


3.10 


15. « 


11.7 


.000 


18.9 


39.0 


38.5 


11.0 


2.29 




2.67 


(WY) 1960 193A 


193A 


19'i'i 


1977 


1950 


1977 


1977 


1920 


1920 


1920 




1920 


SUM1ARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 


WATER YEAR 




WATER YEARS 1910 


1 - 


1993 


ANNUAL TOTAL 




68117 






89847 














ANNUAL MEAN 




186 






246 






203 








HIGHEST ANNUAL MEAN 
















305 






1967 


LOWEST ANNUAL MEAN 
















84.0 






1920 


HIGHEST DAILY MEAN 




32'i 


Mar 14 




327 


Mar 18 




351 


Oct 


31 


1982 


LOWEST DAILY MEAN 




30 


Feb 20 




26 


Feb 20 




.00 


Jul 


31 


1910 


ANNUAL SEVEN-DAY MINIMUM 




92 


Sep 1 




116 


Aug 18 




.00 


Aug 


7 


1913 


ANNUAL RUNOFF (AC-FT) 




135100 






178200 






147000 








10 PERCENT EXCEEDS 




321 






324 






312 








50 PERCENT EXCEEDS 




147 






306 






215 








90 PERCENT EXCEEDS 




133 






143 






56 









278 



EEL RIVER BASIN 



11471099 POTTER VALLEY POWERHOUSE TAILRACE NEAR POTTER VALLEY. CA 

LOCATION. --Lot 39'21'A2", long 123'07'38", in SW 1/4 NW 1/4 sec. 6, T.17 N., R.ll W. , Mendocino County, Hydrologic 
Unit 18010103, 100 ft downstream from powerhouse of Pacific Gas and Electric Co., 1.8 mi southwest of Van 
Arsdale Dam, and 2.9 mi northwest of town of Potter Valley. 

PERIOD OF RECORD. --October 1987 to current year. October 1931 to September 1984, record published for Potter 
Valley Powerhouse Intake (station 11471000) not equivalent because diversion for Irrigation is Included. 

GAGE. --Discharge computed as difference between Potter Valley Powerhouse Intake (station 11471000) and the 
combined flows of Potter Valley Irrigation District East Canal and Potter Valley Irrigation District West 
Canal. Elevation of tailrace is 1,020 ft above sea level, from topographic map. 

REMARKS. --No estimated daily discharges. Flow represents inflow into the Russian River basin after passing 
through powerhouse. 

COOPERATION. — Records collected by Pacific Gas and Electric Co., under general supervision of the U.S. (geological 
Survey, in connection with a Federal Energy Regulatory Coninission project. 

EXTREMES FOR PERIOD OF RECORD . —Maximum daily discharge, 326 ft'/s. Mar. 16, 1993; no flow Apr. 4, 5, and 
July 18-20, 1990. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN V/iLUES 



DAY 



(XT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


128 


160 


138 


88 


307 


322 


322 


317 


318 


265 


113 


117 


2 


133 


164 


146 


237 


293 


321 


322 


316 


318 


263 


112 


121 


3 


139 


151 


146 


302 


301 


322 


307 


316 


41 


256 


113 


124 


4 


141 


147 


142 


299 


281 


321 


322 


314 


318 


261 


116 


121 


5 


138 


147 


141 


303 


308 


322 


321 


314 


318 


263 


114 


121 


6 


137 


144 


156 


285 


308 


322 


318 


317 


316 


259 


116 


123 


7 


135 


145 


165 


303 


307 


323 


317 


316 


318 


252 


117 


116 


8 


129 


143 


122 


305 


307 


323 


323 


316 


318 


254 


118 


118 


9 


123 


140 


84 


306 


306 


323 


323 


316 


318 


276 


129 


212 


10 


122 


140 


130 


306 


306 


323 


323 


317 


316 


110 


122 


301 


11 


133 


140 


160 


306 


305 


324 


324 


317 


316 


115 


121 


300 


12 


142 


141 


161 


306 


312 


324 


324 


318 


316 


123 


124 


299 


13 


134 


142 


161 


306 


319 


324 


324 


318 


316 


118 


122 


299 


14 


130 


143 


159 


126 


321 


324 


323 


318 


317 


117 


122 


299 


15 


112 


142 


160 


181 


321 


325 


323 


318 


308 


121 


122 


298 


16 


112 


141 


215 


305 


321 


326 


323 


318 


308 


121 


126 


282 


17 


129 


142 


317 


305 


321 


325 


323 


316 


224 


119 


130 


291 


18 


137 


141 


320 


304 


321 


325 


323 


308 


307 


123 


114 


295 


19 


131 


145 


319 


303 


237 


323 


322 


309 


301 


127 


19 


305 


20 


139 


142 


318 


78 


26 


323 


323 


314 


302 


118 


26 


305 


21 


147 


141 


318 


184 


200 


323 


322 


312 


301 


121 


117 


291 


22 


144 


148 


320 


303 


322 


322 


319 


313 


288 


116 


120 


299 


23 


144 


148 


321 


303 


322 


322 


323 


318 


283 


116 


120 


302 


24 


142 


145 


279 


303 


322 


321 


315 


311 


282 


119 


117 


300 


2S 


141 


142 


309 


303 


322 


321 


315 


315 


284 


123 


115 


305 


26 


143 


144 


311 


303 


321 


321 


314 


319 


284 


121 


116 


297 


27 


143 


143 


312 


301 


321 


321 


320 


319 


284 


121 


115 


292 


28 


142 


142 


310 


302 


322 


321 


317 


318 


285 


111 


113 


287 


29 


151 


140 


309 


303 





321 


315 


318 


264 


114 


112 


285 


30 


158 


137 


310 


307 





321 


317 


316 


264 


112 


119 


285 


31 


159 





165 


307 





321 





319 





112 


117 





TOTAL 


4236 


4330 


6924 


8473 


8280 


10000 


9607 


9791 


8733 


4947 


3477 


7390 


MEAN 


137 


144 


223 


273 


296 


323 


320 


316 


291 


160 


112 


246 


MAX 


159 


164 


321 


307 


322 


326 


324 


319 


318 


276 


130 


305 


MIN 


112 


137 


84 


78 


26 


321 


307 


308 


41 


110 


19 


116 


AC-FT 


8410 


8590 


13730 


16810 


16420 


19830 


19060 


19420 


17320 


9810 


6900 


14660 



EEL RIVER BASIN 



279 



11471099 POTTER VALLEY POWERHOUSE TAILRACE NEAR POTTER VALLEY, CA— Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1988 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 191 168 


180 


214 


232 


268 


220 


191 


157 


111 




97.1 


1S6 


MAX 311 245 


292 


291 


300 


323 


320 


316 


291 


160 




112 


282 


(WY) 1991 1991 


1989 


1989 


1990 


1993 


1993 


1993 


1993 


1993 




1993 


1990 


MIN 79.3 90.1 


79.6 


35.8 


45.0 


136 


53.7 


97.0 


90.8 


74.7 




81.5 


82.1 


(WY) 1989 1988 


1991 


1991 


1991 


1988 


1990 


1988 


1989 


1990 




1988 


1988 


SUf«ARY STATISTICS 


FOR 


1992 CALENDAR YEAR 




FOR 1993 


WATER YEAR 




WATER 


YEARS 1988 - 


1993 


ANNUAL TOTAL 




62177 






86190 














ANNUAL MEAN 




170 






236 






182 








HIGHEST ANNUAL MEAN 
















236 






1993 


LOWEST ANNUAL MEAN 
















141 






1988 


HIGHEST DAILY MEAN 




324 


Mar 14 




326 


Mar 16 




326 




Mar 16 


1993 


LOWEST DAILY MEAN 




30 


Feb 20 




19 


Aug 19 






00 


Apr 4 


1990 


ANNUAL SEVEN-DAY MINIMUM 




67 


Aug 29 




90 


Aug 18 




3. 


7 


Jul 16 


1990 


ANNUAL RUNOFF (AC-FT) 




123300 






171000 






131800 








10 PERCENT EXCEEDS 




321 






322 






316 








50 PERCENT EXCEEDS 




140 






298 






141 








90 PERCENT EXCEEDS 




97 






118 






73 









280 



EEL RIVER BASIN 
11471500 EEL RIVER AT VAN ARSDALE DAM, NEAR POTTER VALLEY, CA 



LOCATION.— Lat 39'23'19", long 123'06'54", in NE 1/4 sec. 30, T.18 N., R.ll W, Mendocino County, Hydrologic Unit 
18010103, on left bank 1,000 ft downstream from Van Arsdale Dam and 4.6 mi north of tovm of Potter Valley. 

DRAINAGE AREA. --349 mi^. 

PERIOD OF RECORD. --November 1909 to September 1922 (combined monthly discharge only, of Eel River at this station 
and Snow Mountain Water and Power Co . ' s tailrace near Potter Valley), October 1922 to current year. Monthly 
discharge only for some periods, published in WSF 131S-B. Prior to October 1929, published as South Eel River 
at Van Arsdale Dam, near Potter Valley. 

REVISED RECORDS. --WSP 1315-B: 1913, 1920-23, 1925-27. WSP 1395: 1923(M), 1938. 

GAGE. --Water-stage recorder. Elevation of gage is 1,400 ft above sea level, from topographic map. 

Nov. 18, 1909, to Mar. 3, 1927, recorder in reservoir 800 ft upstream from Van Arsdale Dam at different 
datum. Oct. 1, 1927, to Feb. 28, 1937, nonrecordlng gage at present site and datum. 

REMARKS. --No estimated daily discharges. Flow regulated by Lake Pillsbury (station 11470000) 11 mi upstream. 
Low flows may be further regulated at Van Arsdale Dam by calibrated gates in dam and fish ladder. Water is 
diverted from Van Arsdale Reservoir through tunnel to Potter Valley Powerhouse Intake (station 11471000), 
after which part is used for irrigation and remainder flows into East Fork Russian River (see station 
11471099). Records given represent only flow in the Eel River. 

COOPERATION. --Records collected by Pacific Gas and Electric Co., under general supervision of the U.S. Geological 
Survey, in connection with a Federal Energy Regulatory Commission project. 

EXTREMES FOR PERIOD OF RECORD. --Maximum discharge, 64,100 ft^/s, Dec. 22, 1964, gage height, 33.9 ft from 
floodmarks; no flow at times. 

EXTREMES FOR CURRENT YEAR. --Maximum discharge, 27,600 ft^/s, Jan. 20, gage height, 26.66 ft; minimum daily, 
5.1 ft^/s. June 29. 

DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 

DAILY MEAN VALUES 



DAY 



OCT 



NOV 



DEC 



JAN 



FEB 



MAR 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



1 


6.2 


8.3 


8. 


3 


9430 


994 


1130 


814 


296 


1340 


6.6 


6.8 


6.8 


2 


6.3 


8.2 


8. 


2 


3090 


879 


1080 


638 


341 


1090 


6.6 


6.6 


6.8 


3 


6.2 


8.3 


8. 


2 


1430 


771 


1170 


355 


692 


741 


6.6 


6.6 


6.9 


4 


6.2 


8.2 


8. 


2 


899 


706 


1280 


335 


537 


673 


6.6 


7.9 


6.8 


5 


5.9 


8.2 


8. 


2 


683 


792 


1100 


253 


383 


673 


6.6 


7.2 


6.8 


6 


6.4 


8.2 


110 




640 


1030 


1080 


139 


290 


645 


6.7 


7.1 


6.9 


7 


6.4 


8.3 


169 




2030 


1010 


1140 


140 


288 


581 


6.6 


7.1 


6.9 


8 


18 


8.2 


745 




2030 


1490 


1170 


174 


308 


394 


6.6 


7.0 


6.9 


9 


6.4 


8.2 


977 




1400 


2000 


1160 


185 


301 


284 


6.6 


6.8 


6.9 


10 


6.5 


8.2 


1040 




1040 


1690 


1140 


173 


287 


168 


6.7 


6.9 


6.9 


11 


6.4 


8.3 


702 




781 


2390 


1040 


164 


281 


31 


6.7 


5.4 


6.9 


12 


6.4 


8.3 


416 




641 


1920 


993 


145 


271 


65 


6.7 


9.0 


6.8 


13 


6.4 


8.3 


264 




903 


1480 


987 


129 


266 


60 


6.6 


10 


6.7 


14 


6.5 


8.2 


221 




4000 


1210 


1030 


127 


260 


22 


6.5 


9.7 


6.6 


15 


6.4 


8.2 


297 




3590 


1040 


1070 


121 


277 


23 


6.5 


9.4 


6.6 


16 


6.4 


8.3 


266 




3000 


900 


1040 


111 


210 


28 


6.6 


7.8 


6.6 


17 


6.4 


8.3 


268 




2240 


930 


2960 


362 


115 


33 


6.5 


6.6 


6.7 


18 


6.4 


8.2 


172 




1650 


2070 


3790 


727 


117 


13 


6.5 


6.9 


6.8 


19 


6.5 


8.2 


118 




1290 


5950 


2750 


816 


107 


14 


6.6 


8.7 


6.8 


20 


6.4 


8.3 


137 




16300 


6540 


2000 


797 


82 


13 


6.7 


9.8 


6.8 


21 


6.3 


8.3 


125 




12500 


3890 


1590 


780 


69 


13 


6.7 


6.9 


6.8 


22 


6.4 


8.3 


110 




9360 


2800 


1340 


762 


61 


7.9 


6.7 


6.8 


6.7 


23 


6.4 


8.3 


107 




5090 


3300 


1400 


749 


61 


8.2 


6.6 


6.6 


6.6 


24 


6.4 


8.2 


151 




3200 


2940 


2330 


659 


74 


6.7 


6.7 


6.8 


6.8 


25 


6.3 


8.2 


117 




2280 


2180 


1920 


547 


78 


5.4 


6.7 


6.7 


6.7 


26 


6.3 


8.3 


107 




1830 


1750 


1500 


352 


215 


25 


6.6 


6.7 


6.S 


27 


6.3 


8.3 


105 




1600 


1440 


1250 


144 


595 


6.1 


6.5 


6.7 


6.7 


28 


6.2 


8.2 


289 




1480 


1250 


1070 


82 


420 


11 


6.7 


6.7 


6.7 


29 


18 


8.3 


396 




1330 





928 


76 


418 


5.1 


6.6 


6.7 


6.7 


30 


42 


8.3 


302 




1180 





833 


134 


432 


7.6 


6.5 


6.6 


6.7 


31 


26 





5380 




1060 





780 





1250 





6.7 


6.7 





TOTAL 


275.3 


247.6 


13132. 


1 


97977 


55342 


44051 


10990 


9382 


6987.0 


205.1 


227.2 


203.1 


MEAN 


8.88 


8.25 


424 


3161 


1976 


1421 


366 


303 


233 


6.62 


7.33 


6.77 


MAX 


42 


8.3 


5380 


16300 


6540 


3790 


816 


1250 


1340 


6.7 


10 


6.9 


MIN 


5.9 


8.2 


8. 


2 


640 


706 


780 


76 


61 


5.1 


6.5 


5.4 


6.6 


AC-FT 


546 


491 


26050 


194300 


109800 


87380 


21800 


18610 


13860 


407 


451 


403 



EEL RIVER BASIN 



281 



11A71500 EEL RIVER AT VAN ARSDALE DAM. NEAR POTTER VALLEY. CA--Continued 



STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1923 - 1993, BY WATER YEAR (WY) 

OCT NOV DEC JAN FEB MAR APR MAY JUN 



JUL 



AUG 



SEP 



MEAN 


12.0 


134 


712 


1264 


1470 


1001 


558 


150 


21.4 


4.91 


5.46 


5.15 


MAX 


153 


2389 


5249 


6293 


8904 


5492 


3863 


1174 


233 


13.4 


54.1 


27.9 


(WY) 


1963 


1974 


1965 


1970 


1986 


1983 


1982 


1983 


1993 


1990 


1980 


1959 


MIN 


.86 


1.30 


1.78 


2.00 


3.62 


2.00 


2.00 


2.00 


1.07 


1.06 


1.09 


1.10 


(WY) 


1953 


1953 


1937 


1924 


1977 


1924 


1924 


1924 


1931 


1931 


1931 


1931 



SUmARY STATISTICS 

ANNUAL TOTAL 
ANNUAL MEAN 
HIGHEST ANNUAL MEAN 
LOWEST ANNUAL MEAN 
HIGHEST DAILY MEAN 
LOWEST DAILY MEAN 
ANNUAL SEVEN-DAY MINIMUM 
INSTANTANEOUS PEAK FLOW 
INSTANTANEOUS PEAK STAGE 
ANNUAL RUNOFF (AC-FT) 
10 PERCENT EXCEEDS 
50 PERCENT EXCEEDS 
90 PERCENT EXCEEDS 



FOR 1992 CALENDAR YEAR 

54511.4 
149 



5630 Feb 20 
5.9 Oct 5 
6.2 Sep 29 



108100 
351 
8.2 
6.4 



FOR 1993 WATER YEAR 



WATER YEARS 1923 - 1993 



239019.4 










655 




435 
1546 
3.46 




1983 
1977 


16300 


Jan 20 


49500 


D